Skyband MDMS

RNU4M/RNU8M
Equipment Description and Mounting
Instructions

AN00236122 (62.1017.510.90-A001)
Edition g, 03.2003
M a r c o n i C o m m u n ic a tio n s G m b H
D -7 1 5 2 0 B a c k n a n g
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M a r c o n i, M a r c o n i C o m m u n ic a tio n s , d a s M a r c o n i L o g o ,
S k y b a n d , M D R S , M D M S u n d S e r v ic e O n A c c e s s s in d e in g e tr a g e n e M a r k e n z e ic h e n
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M a r c o n i, M a r c o n i C o m m u n ic a tio n s , th e M a r c o n i lo g o ,
S k y b a n d , M D R S , M D M S a n d S e r v ic e O n A c c e s s a r e tr a d e m a rk s o f
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W in d o w s is a tr a d e m a r k o f M ic r o s o ft C o r p o r a tio n , R e d m o n d .
AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Contents

Contents

Introduction 1

Chapter 1
General

1.1 RNUs in the Marconi Digital Multipoint System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 Information on intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1.3 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.3.1 Compliance with safety standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.2 Personnel safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.3 Equipment safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Chapter 2
Functional Design

2.1 Modems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.1.1 Overview of functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.2 Modulation schemes used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.3 Dynamic carrier switchover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.2 Subscriber-side 2 Mbit/s interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

2.2.1 ISDN primary multiplex access (PMXA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.1.1 Implementation in the MDMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.2 S2M functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.2.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.2.2.2 Fault-locating loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.2.2.3 Fault signalling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.2.2.4 Fault detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.3 Generating performance data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2.3 IF Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2.4 OAM switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

2.5 External Device Interface (EDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

2.6 DC/DC mains adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

2.7 CPM module (Connector Panel Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

2.8 A&E Smart Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

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2.9 Indoor-Outdoor communication IOC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Chapter 3
Mechanical Design, Interfaces and Maintenance

3.1 RNU4M / RNU8M hardware components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.2 Front views with interface variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3.3 RNU interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.3.1 IF interface to the Outdoor Unit (ODU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.3.2 External Device Interface (EDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.3.3 UAI interface (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.4 Supply voltage -48 V DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

3.4 Optical signalling (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

3.5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Chapter 4
Installation

4.1 Mounting the RNU4M / RNU8M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.2 Preparatory measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.3 Installation in a 19“ rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.4 Installation in an ETS rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.5 Using the RNU as desktop unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.6 Wall mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4.2 Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4.2.1 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.2.2 Power supply connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.2.3 2 Mbit/s interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.2.4 External Device Interface (EDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.2.5 Connecting the Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Chapter 5
Commissioning the RNU4M / RNU8M

5.1 On-site commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2 QD2 functional model of the RNU4M / RNU8M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Chapter 6
Technical Characteristics

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6.1 Environmental conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.2 Mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.3 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.3.1 Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.3.2 2 Mbit/s interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.3.3 EDI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Figures

Figures
Fig. 0.1 RNU4M Sub-D version with two 2 Mbit/s interfaces . . . . . . . . . . . . . . . . . . . . . 1-1

Fig. 0.2 RNU8M Sub-D version with four 2 Mbit/s interfaces . . . . . . . . . . . . . . . . . . . . . 1-1

Fig. 1.1 Schematic drawing of RNU4M / RNU8M within the MDMS . . . . . . . . . . . . . . . 1-1

Fig. 2.1 Block diagram of the RNU4M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Fig. 2.2 Block diagram of the RNU8M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Fig. 2.3 Primary multiplex access (PMXA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Fig. 2.4 Fault-locating loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Fig. 2.5 Fault signalling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Fig. 2.6 Fault detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Fig. 3.1 Components of RNU4M and RNU8M (top view) . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Fig. 3.2 Front views of all interface variants of RNU4M . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Fig. 3.3 Front views of all interface variants of RNU8M . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Fig. 3.4 Ports on the RNU4M and RNU8M (general, left) . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Fig. 3.5 Ports on the RNU4M and RNU8M (general, right) . . . . . . . . . . . . . . . . . . . . . . . 3-4

Fig. 3.6 Arrangement of pins of the Mini-Snap connector (female) . . . . . . . . . . . . . . . . 3-6

Fig. 3.7 Alarm signalling via the EDI signalling input (schematic drawing) . . . . . . . . . . . 3-8

Fig. 3.8 EDI control line in both switching statuses (schematic drawing) . . . . . . . . . . . . 3-9

Fig. 3.9 Pin assignment of the power supply port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Fig. 4.1 Top view of the closed RNU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Fig. 4.2 Wall mounting the RNU with front panel pointing to the right . . . . . . . . . . . . . . 4-4

Fig. 4.3 Wall mounting the RNU with front panel pointing to the left . . . . . . . . . . . . . . . 4-4

Fig. 5.1 QD2 functional model of the RNU4M / RNU8M . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Fig. 5.2 QD2 functional scheme of the modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Tables

Tables
Tbl. 0.A Ordering information and CE declaration numbers of RNU basic units . . . . . . . 1-2

Tbl. 0.B Ordering information and CE declaration numbers of CPMs for RNU4M . . . . . 1-2

Tbl. 0.C Ordering information and CE declaration numbers of CPMs for RNU8M . . . . . 1-2

Tbl. 2.A Modulation schemes and channel-coding rates . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Tbl. 2.B Signalling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Tbl. 2.C Interface to the Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Tbl. 3.A Specifications of the 2 Mbit/s interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Tbl. 3.B Pin assignment of the RJ45 connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Tbl. 3.C Pin assignment of the Sub-D connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Tbl. 3.D Pin assignment of the Mini-Snap connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Tbl. 3.E Pin assignment of the EDI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Tbl. 3.F Optical signalling of the RNU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Tbl. 5.A Modem application functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Abbreviations

Abbreviations

ABBREVIATION MEANING

A-Bit Alarm Indication Bit

AIS Alarm Indication Signal
AUXP AUXiliary Pattern (10101010)
BER Bit Error Ratio
BPV Bipolar Violation (Code error)
BS Base Station
CER Code Error Ratio (recovered from code violations)
CPM Connection Panel Module
CRC Cyclic Redundancy Check (here: CRC4 from 4 bits)
DBA Dynamic Bandwidth Allocation
DIVO Digital Local Exchange
DSA Digital Signal Section
DSA2 2 Mbit/s Digital Signal Section
DSV Digital Signal Link
DSV2 2 Mbit/s Digital Signal Link
E-Bit CRC4 Error Bit
EDC Error Detection Code
EDI External Device Interface
ET Exchange Termination
ETS, ETSI European Telecommunications Standards (Institute)
FAS Frame Alignment Signal
HDSL High Bit Rate Digital Subscriber Line
IF Intermediate Frequency
ISDN Integrated Services Digital Network
ITU International Telecommunication Union
LB Loopback (switched test loop)
LED Light-Emitting Diode
LMT Local Maintenance Terminal
LOF Loss Of Frame
LOS Loss Of Signal
LT Line Termination (Line Terminating Unit for the S2M transmission system)
Modem To Modem (Signalling channel between two modems via the radio
M2M
IF)
MDMS Marconi Digital Multipoint System

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Abbreviations Issue g, 03.2003

ABBREVIATION MEANING

MF Multi-Frame (structure of PCM data)

MFAS Multi-Frame Alignment Signal
MOCO Modem Controller
MUX Multiplexer
NMS Network Management System
Network Termination (Network Terminating Unit for the S2M transmission
NT
system)
OAM Operation, Administration, Maintenance
ODU Outdoor Unit
OOF Out Of Frame
PABX Private Automatic Branch Exchange
PDH Plesiochronous Digital Hierarchy
PM Performance Monitoring
PMXA Primary Multiplex Access
QD2 Network Management Interface of the Deutsche Telekom AG
QM Quality Management
RAI Remote Alarm Indication
RF Radio Frequency
RNU Remote Network Unit
RS232 Interface acc. to ITU V.24; Spec. to EIA RS-232
Rx Receive
S2M ISDN 2 Mbit/s interface between TE and NT
Sa Additional Signalling Bits
Si International Signalling Bits
SISA Supervisory and Information System for local and remote Areas
SMF Sub-Multi-Frame
SNI Service Node Interface
SST Interface
STM Synchronous Transport Module
TE Terminal Equipment
TS Technical Specification
TS Terminal Station
Tx Transmit
U2 ISDN 2 Mbit/s interface between the NT and LT
UAI Interface to the Service PC
UNI User Network Interface
V2M ISDN 2 Mbit/s interface between the LT and ET

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Introduction

Chapter 0
Introduction

The present document describes the design and functioning as well as the
mounting procedure for RNU4M and RNU8M units.

RNU4M and RNU8M

RNU4M and RNU8M are used to set up the radio link with a transmission
capacity of 2 or 4 x 2 Mbit/s (4096 or 8192 bit/s) between a Terminal Station
and the Base Station.

On the radio side (to the Base Station), the RNU is connected to the
Outdoor Unit using a coaxial cable (IF cable).

Note: Use the extended-power ODU for RNU8M versions

determined for MDMS 26 GHz!

Two or four 2 Mbit/s subscriber interfaces (G.703) are made available.

The following schematic drawings show the front views of RNU4M and
RNU8M providing Sub-D connectors.

Subscriber interfaces

E1 E1

1 2

Fig. 0.1: RNU4M Sub-D version with two 2 Mbit/s interfaces

Subscriber interfaces

E1 E1 E1 E1

1 2 3 4

Fig. 0.2: RNU8M Sub-D version with four 2 Mbit/s interfaces

Both the RNU4M and RNU8M are available in two versions for 3.5/10.5
GHz and 26 GHz. In addition, four different connector types can be
supplied for setting up the 2 Mbit/s interface connections.

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Ordering information and versions

The following tables give an overview of the ordering information and CE
declaration numbers. The individual CE declarations can be ordered from
or inspected at Marconi under the relevant number.

At least two ordering numbers are required for an RNU4M or RNU8M, i.e.
one for the basic unit and another one for the font panel with CPM
(Connection Panel Module). In addition, it must be indicated whether the
RNU shall be equipped with a Smart Card for the optional A & E
performance feature (see section 2.8).

Table 0.A: Ordering information and CE declaration numbers of RNU basic

units

DESIGNATION REFERENCE PART NO. CE DECLARATION

RNU4M
62.7037.660.00-A001 AN00220597 62.7037.660.00-CE001
(10.5/3.5 GHz)
RNU4M
62.7037.660.00-A002 AN00227474 62.7037.660.00-CE002
(26 GHz)
RNU8M
62.7037.700.00-A001 AN00220598 62.7037.700.00-CE001
(10.5/3.5 GHz)
RNU8M
62.7037.700.00-A002 AN00227475 62.7037.700.00-CE002
(26 GHz)

Table 0.B: Ordering information and CE declaration numbers of CPMs for

RNU4M

DESIGNATION REFERENCE PART NO. CE DECLARATION

CPM2/RJ45 62.7037.670.02-A001 AN00227497 62.7037.670.02-CE001

CPM2/BNC 62.7037.670.05-A001 AN00227500 62.7037.670.05-CE001

CPM2/SUB-D 62.7037.670.08-A001 AN00228029 62.7037.670.08-CE001

CPM2/MINI-SNAP 62.7037.670.11-A001 AN00228032 62.7037.670.11-CE001

Table 0.C: Ordering information and CE declaration numbers of CPMs for

RNU8M

DESIGNATION REFERENCE PART NO. CE DECLARATION

CPM4/RJ45 62.7037.670.03-A001 AN00227498 62.7037.670.03-CE001
CPM4/BNC 62.7037.670.06-A001 AN00227501 62.7037.670.06-CE001
CPM4/Sub-D 62.7037.670.09-A001 AN00228030 62.7037.670.09-CE001
CPM4/Mini-Snap 62.7037.670.12-A001 AN00228033 62.7037.670.12-CE001

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 General

Chapter 1
General

1.1 RNUs in the Marconi Digital Multipoint System

The following figure shows the RNU4M / RNU8M in a schematic diagram
of the Marconi Digital Multipoint System (MDMS).

Terminal Stations Base Station

ODU
RNU4M

Modem*
2 Mbit/s 1 IF Unit*
2

RF
Unit Base Station
(Indoor Unit)
ODU
any RNU type
a/b, RBS
Uk0,
nx64k, CDN
S0, ODUs
2 Mbit/s,
10 Base T RF
Unit V 5.1
Central V5.2
Radio
distrib. V2M
Base 2 Mbit/s node 2 Mbit/s
RF Station
Unit
(MSV5) STM-1
ODU STM-4
RNU8M

Modem*
1
2 Mbit/s 2 IF Unit
3
4
RF
Unit
UNI SNI

Fig. 1.1: Schematic drawing of RNU4M / RNU8M within the MDMS

On the left-hand side of this drawing there are the RNUs providing the
interfaces referred to as User Network Interfaces (UNI) on the subscriber
side. With the RNU4M and RNU8M, these are 2 Mbit/s interfaces. Other
RNU types can provide a variety of other subscriber interfaces.

On the right-hand side, there is the Base Station with its interface to the
exchange. This interface is referred to as Service Node Interface (SNI).

Between the RNU and Base Station there is a radio hop which
interconnects the Outdoor Units (ODUs) on both sides.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Information on intended use Issue g, 03.2003

1.2 Information on intended use

The radio system may only be put into operation in accordance with the
purpose defined in the operating instructions and with the specified
parameters (e.g. transmit power, transmission rate, frequency band,
modulation mode and safety distance from the antenna to avoid health
risks caused by electromagnetic fields etc.). Any change in technical
features and location may result in cancellation of the operating permit.

Operation of this radio system is permitted in many countries including EU

member states and is subject to the operating conditions prevailing in each
country. Operation is only permitted with the approval of the authority
responsible for frequency management in each country and in agreement
with the prevailing operating regulations of the Fixed Radio Service in the
planned frequency band (channel). This approval must be obtained before
commissioning.

Installation and operation may only be carried out by suitably trained

personnel.

The system may be installed and operated only in locations with restricted
access.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Safety instructions

1.3 Safety instructions

1.3.1 Compliance with safety standards
The safety instructions described in this document are in compliance with
the safety regulations as per EN60950 (Safety of installations of information
technology systems).

Ignoring these safety instructions and the warnings may result in injury and
damage to property.
It is therefore required that only trained and qualified personnel
(maintenance staff as per EN 60950) install and maintain the system.

1.3.2 Personnel safety

In electrical systems, certain parts are of course live. Some parts

can also have high operating temperatures.

The unit may be taken into operation only after having set up the re-
quired connection to ground. This grounding must be in compliance
with the relevant national regulations.

1.3.3 Equipment safety

The units include components sensitive to electrostatic discharge.

When handling printed circuit boards, always wear a grounding
bracelet in order to avoid damage to such components due to elec-
trostatic discharge.

If you transfer the modules or units from a cold to a warmer environ-

ment, this may result in condensation forming on the modules or
units.
Modules and units must be dry before you may take them into ope-
ration.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Equipment safety Issue g, 03.2003

This page has been left blank for editorial reasons.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Functional Design

Chapter 2
Functional Design

The following two block diagrams give a schematic overview of the RNU
functional blocks. Except for their number of modems* and 2 Mbit/s
interfaces, the RNU4M and RNU8M are identical with respect to both their
functions and mechanical design.
to the ODU RS232 interface EDI

EDI
IF Unit* OAM
(External Device
Switch Smart
Interface) Fan
Card
Modem* Modem* (A&E)
#2 #1

DC / DC mains adapter
for IF Unit, Modems, EDI and Fan
CPM

2 x 2 Mbit/s (G.703)

Figure 2.1: Block diagram of the RNU4M

to the ODU RS232 interface EDI

EDI
IF Unit* OAM
(External Device
Switch Smart
Interface) Fan
Card
Modem* Modem* Modem* Modem* (A&E)
#4 #3 #2 #1

DC / DC mains adapter
for IF Unit, Modems, EDI and Fan
CPM

4 x 2 Mbit/s (G.703)

Figure 2.2: Block diagram of the RNU8M

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Modems Issue g, 03.2003

2.1 Modems
The modems represent the kernel of the RNU4M/8M. Each modem
handles one data stream of up to 2 Mbit/s. Modem # 1 serves E1 port 1.
The 2 Mbit/s interface of modem #2 E1 is made available as an external
interface via a CPM.

2.1.1 Overview of functions

The modem fulfills the following functions:

• Modulation/demodulation (modem kernel)

with 5 modulation schemes from (see section 2.1.2, Table 2.A: )
• DBA switching
• Framing/deframing (G.704, transparent, ISDN PRA)
(see section 2.2)
• Recovery of performance data to G.826
(see section 2.2.3)
• Data encryption/decryption acc. to the DES standard, optional
(also see section 2.8 on page 2-12)
• Output of status and alarm messages via the Service PC

The modem #1 (or ’Master modem’) holds a special position and handles
the following central functions:

• Communication with the Service PC for loading the operating

software (MOCO) and configuring the RNU
• EDI interface and fan control
• Access to the A& E Smart Card
(see section 2.8 on page 2-12)

Note: The general prerequisite required for the proper

functioning of this RNU is the commissioning process
successfully executed by means of the INCO (Installation
Controller). The Master Modem link is obligatorily necessary
for remote access via the SECO/SOA to the following
functions:

• EDI interface control

• SW upgrade

Without a Master Modem link, please note the following:

A. With system version MDMS 4.2 and higher:
The link performance of the Slave Modem link(s) is not affected,
since the exchange of all relevant data is ensured via the internal
CAN bus interface.
B. With system version < MDMS 4.2:
The link performance of the slave modem link(s) may be affected,
since in this case an internal exchange of relevant data is not being
supported.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Modulation schemes used

2.1.2 Modulation schemes used

The following modulation schemes with different channel coding rates are
used:

Table 2.A: Modulation schemes and channel-coding rates

MODULATION QPSK 8PSK 16PSK

Convolutional Coding Rate 1/2 X
Trellis Coding Rate2/3 X
Convolutional Coding Rate3/4 X
Trellis Coding Rate3/4 X
Convolutional Coding Rate7/8 X

2.1.3 Dynamic carrier switchover

The DBA (Dynamic Bandwidth Allocation) performance feature permits a
dynamic reaction to changing data traffic volumes. The modem can set up
a second carrier in addition to the one existing. This second carrier may
have new transmission parameters, i.e. a new data rate, modulation,
coding, carrier frequency, power level etc..

The existing carrier remains in operation until the new carrier has been
completely set up and synchronized. After completing the setup of the new
carrier and synchronizing it, the traffic is switched over from the existing to
the new carrier. Then the old carrier is deleted.

This feature maximizes the sector capacity by taking the traffic volume into
consideration. The bandwidth adaptation is controlled by the Base Station.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Subscriber-side 2 Mbit/s interface Issue g, 03.2003

2.2 Subscriber-side 2 Mbit/s interface

The subscriber-side 2 Mbit/s interface supports the following transmission
modes (the mode indicated refers to the designation of the respective
setting in the ’ServiceOn Access’ system):

— PMXA-mode (FBA): Transmission of structured E1-signal

(G.704) with a data rate of 1984 kbit/s
for ISDM-primary rate access.

— Transparent-mode (FBS) :Clock- and data-transparent trans-

mission of structured and unstructured
E1-signals.

— PCS-mode (FBA): Clock- and data-transparent trans-

mission of structured and unstructured
E1-signals. Monitoring of structured
E1-signals (G.704) possible.

— DMS-mode (DBA/FBA):Transmission of structured E1-signals

(G.704) with a data rate of 1984 kbit/s
for permanent circuits. Time slot 0 is
terminated. DBS operation is possible.
Subcriber timing only in cooperation
with MSV5 or MS1/4.

You can select between four different connector variants which can be
used to make the signal available on the RNU front panel (see section 3.2).

2.2.1 ISDN primary multiplex access (PMXA)

2.2.1.1 Implementation in the MDMS

S2M is a 2 Mbit/s interface specified by the Deutsche Telekom AG and

used for the transmission of E1 signals. This interface has been designed
for an access network which connects a subscriber to the public ISDN
network and simultaneously permits the complete line section between the
DIVO and subscriber terminating equipment (TE) to be permanently
monitored.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Implementation in the MDMS

The classical access is referred to as primary multiplex access (PMXA). It

is depicted in the following block diagram for the MDMS.
e1_s2m.dsf QD2 QD2
QM QM

QD2
S2M V2M
(UNI) U2 U2 (SNI) V2M
BS BS
TS Modem Mux
S2MAN V2MAB V2MAB DIVO
TE NT LT DSV2
(NT2) (NT1)
S2MAB V2MAN V2MAN

Mux Mux ET
BS
TS Modem
S2MAN V2MAB V2MAB
TE NT LT
(NT2) (NT1)
S2MAB V2MAN V2MAN

MDMS (subscriber access)

Viewed acc. to 1 TR 238:

Local DSA2 Local
Subscriber area Access line exchange connecting cable exchange

Viewed acc. to ETSI ETS 300233:

Access digital section Digital link

Digital access link

Viewed acc. to TS 0225/96:

NT2 NT2M LT2M DSV2 DIVO

Fig. 2.3: Primary multiplex access (PMXA)

In addition to the subscriber terminating equipment (TE) and the digital

local exchange (DIVO), the PMXA access includes at least one access
network termination (NT) and one line termination (LT).

The MDMS-BS modem represents the LT. It is connected either directly or

via a transparent digital signal link (DSV2) to the local exchange. The
interface between the LT and DIVO is referred to as V2M interface, whereas
that between the LT and NT is a U-interface. The MDMS-TS corresponds
to the NT. It is used to connect the subscriber terminating equipment (e.g.
a PABX).

The connection between the LT and NT is normally set up via copper cable.
In the MDMS, this connection is replaced by a radio link.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
S2M functions Issue g, 03.2003

In the past, the LT was regarded as part of the local exchange and the DIVO
was responsible for monitoring the link quality. Many tasks of the S2M and
V2M interfaces, signalling of faults and quality information as well as the
possibility of switching test loops for troubleshooting purposes are
resulting from this time.

In the specifications of the Deutsche Telekom AG and the ETSI standard

ETS 300233, the section between S2M and V2M is considered as
stand-alone access system with an own performance monitoring.

A special feature of the MDMS is the connection between the MDMS and
DIVO which is implemented by a digital signal link. Several E1 subscriber
accesses can be integrated into an STM signal by means of a multiplexer
and transmitted, for example, via an optical fiber cable. This digital signal
link must be transparent at the E1 level.

2.2.2 S2M functions

2.2.2.1 General

The following sections describe the MDMS features regarding

troubleshooting, fault signalling and fault detection.

2.2.2.2 Fault-locating loops

In accordance with the initial concept of the PMXA access, two

fault-locating loops have been defined:

3. Using the LT loop, the transmission path is tested up to the output

of the local exchange. This test point is provided by the LT. The E1
signal of the DIVO is looped back at the U2 interface of the LT to
the DIVO. As shown in Fig. 2.4: , this test loop is switched in the
BS modem of the MDMS (external loop) at the V3M interface and
not at the U2 interface.
4. The NT loop is switched to check the correct functioning of the
overall transmission path up to the network terminating point. For
this purpose, the E1 signal of the DIVO is looped back at the S2M
interface of the TS in the MDMS (internal loop).

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Fault signalling

Besides loop control via the NMS (NSUE/SOA), an inband initialization is

also possible from the DIVO by means of the Sa6 code word. In this case,
the DIVO is informed on the loop switched by means of the Sa5 signalling
bit set.
NMS

S 2M V2M

TS BS
Local LB ET
in th e T S
tra n s c e iv e r
N T lo o p L T lo o p (D I V O )
in te r n a l e x te rn a l

R e m o te L B
e 1 _ s 2 m .d s f
in th e B S T m o d e m

Fig. 2.4: Fault-locating loops

2.2.2.3 Fault signalling

Depending on where a fault occurs there are different ways of signalling

detected faults (AIS, LOS, LOF, CER>10-3, BER>10-3) to the DIVO:

1. By injection of an alarm indication signal (AIS), i.e. continuous "1",

channel AIS (structured continuous "1") and auxiliary pattern
(binary 10-sequence).
2. By setting the alarm indication bit (A-bit, RAI).
3. By signalling an alarm by means of an Sa6 code in the service
digits.
By evaluating these different signalling types, the DIVO is enabled in the
S2M-PMXA mode to determine the direction of transmission and localize
the source of the defect. The diagram depicted below shows which
signalling type is used at which point of the system. Each signalling type
shown is assigned to an arrow. The beginning of the arrow indicates the
module where the defect has been detected. The contents of this diagram
are summarized in the table below.

Sa6=1100
and A-Bit=0

AIS Channel AIS Auxiliary AIS

A-bit=1 Sa6=1110 pattern
BS DSV
TE TS Sa6=1111 DIVO
A-bit=1 Modem
M2M
AIS AIS AIS
e1_s2m.dsf

Fig. 2.5: Fault signalling

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Fault detection Issue g, 03.2003

Tab. 2.B: Signalling

FAULT DETECTED AT MODULE IF DIVO RECEIVES

SIGNAL
LOCATION A-BIT SIGNAL SA6 WORD
DIRECTION
Input DSV DIVO - AIS -
Auxiliary
Input BS modem DIVO - -
pattern
Input TS modem DIVO 0 Channel AIS 1100
Output BS modem TE 0 1111
Input TS modem TE 0 1110
Input BS TE 1 0000
Input TE TE 1 0000

2.2.2.4 Fault detection

In E1 systems, faults can be detected by evaluating the CRC check sums

or FAS words. In the return direction, CRC errors are sent back as E-bits:

1. The CRC4 procedure and detection of CRC errors and E-bits can be
switched off at the S2M interface of the TS. Thus, subscriber
terminating equipment not supporting the CRC4 procedure can
also be connected.
2. The components of the subscriber access network must support
CRC. In this section, the CRC check is always active.
In order to permit performance monitoring for the transmission section
between the TS and TE, the information available in the TS on the TE status
is transmitted to the DIVO:

1. An A-bit set in the subscriber terminating equipment is passed on

to the DIVO.
2. Single CRC errors at S2Min are signalled by means of the Sa6 code
word 0010.
3. E-bits received at S2Min are signalled by means of the Sa6 code
word 0001. If CRC errors and E-bits set are occurring
simultaneously, this status is signalled by means of the Sa6 code
word 0011.
4. Faults or defects detected at S2Min are signalled by means of the
Sa6 code word 1100.
The procedures described in item 2) and 3) are possible only if the TE
supports the CRC procedure.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Generating performance data

Optional CRC monitoring

in the subscriber direction
CRC-monitored subscriber access network

E -b it 0010
CRC 000 1

E -b it E -b it
BS D IVO
TE TS (M odem ) DSV
CR C CRC

E-bit + C R C E-bit + C RC e1_s2m .dsf

Fig. 2.6: Fault detection

FAS faults occurring at S2Min are not signalled to the DIVO. If the CRC
detection is switched off in the TS, the DIVO cannot evaluate TE
anomalies/faults.

The link between the TS and DIVO is also monitored by the DIVO in both
directions. In this case, defects are identified by means of the E-bit: In case
of a defect signalled to the TS (via the transparent BS), (see Fig. 2.6: ), the
E-bit is set in the return direction to the DIVO (an E-bit set has the binary
value "0").

With system version V4.2 and higher, the DIVO is capable of monitoring the
complete transmission link up to the TS.

Using a SISA-NMS (NSUE/SOA), it is possible to display information on the

performance of the radio link gained by means of an error detection code
(EDC).

2.2.3 Generating performance data

On the subscriber-side input, performance data (G.826) are generated at
the 2 Mbit/s interface (code error ratio, CRC)

On the radio-side input, the performance data (G.826) are recovered from
the performance of the radio link to the Base Station.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
IF Unit Issue g, 03.2003

2.3 IF Unit
The IF Unit sets up the functional connection between the modems and
Outdoor Unit (ODU).

Both the transmit and receive signal, signalling information as well as the
clock signal and supply voltage for the ODU are transmitted via one single
coaxial cable (IF cable).

Main functions of the IF Unit:

— Conversion of the modem output signals to the required

frequency (Tx function)
— Conversion of the ODU Rx signal to the required modem input
frequency (Rx function)
— Generation of a common clock frequency signal for all modems;
— Activation/deactivation of the ODU HPA (power amplifier)
using the signalling information on the IF coaxial cable.

In the IF Unit, the following fault reports are generated and signalled to the
modem:

— PLL-Tx lock alarm (PLL_Tx_Lock)

— PLL-Rx lock alarm (PLL_Rx_Lock)

Table 2.C: Interface to the Outdoor Unit

POSITION ELECTRICAL CONNECTOR
Connector type N connector, female
Impedance 50 Ohms

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 OAM switch

2.4 OAM switch

The RNU4M/8M is ’supplied, managed and maintained’ via the UAI (PC)
interface in compliance with RS232 using a Service PC loaded with the
INCO software.

The so-called Master modem fulfills the central control function for the
RNU. In order to be able to request both status and protocol information
from each individual modem, the interface can be switched over between
all modems. This switching function is implemented automatically by the
INCO software at the time the latter reads the status and alarm messages
from each modem.

For more detailed information on the maintenance and commissioning

process using the Service PC, please refer to the INCO Manual and the
Terminal Station Commissioning Instructions.

2.5 External Device Interface (EDI)

The EDI interface is used to monitor equipment units and safety devices
such as door contacts, smoke sensors or similar environment sensors.

There are five signalling inputs, one auxiliary voltage of -24 V for powering
the sensors connected as well as one floating switching output.

Using the INCO software, SECO software (for configuring the Radio Base
Station) or the ’ServiceOn Access’ Network Management System, the
inputs can be requested and switched as NO/NC contacts.

Alarms available at signalling inputs 1 to 4 are spontaneously signalled by

the Network Management System, whereas alarms occurring at signalling
input 5 are signalled as INT-B (NE Control).

For a detailed description of the EDI interface, please refer to section 3.3.2
on page 3-7.

2.6 DC/DC mains adapter

The DC/DC mains adapter is supplied with a primary voltage of -48 V DC.
From this voltage it generates all internal supply voltages required by all
components and by the Outdoor Unit (ODU).

2.7 CPM module (Connector Panel Module)

The CPM is composed of the RNU front panel with the corresponding 2
Mbit/s interface connectors that can be designed as RJ45, Sub-D,
Mini-Snap or BNC-pair connectors.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
A&E Smart Card Issue g, 03.2003

An RNU4M or -8M is defined using the part no. of the RNU basic unit (in
10.5/3.5 or 26 GHz version) and the part no. of the CPM to be mounted.
The different front panels available are depicted in section 3.2 on page 3-3.

2.8 A&E Smart Card

A Smart Card is required for the ’authentification and encryption’ function
(A&E). This Smart Card contains the key and license for this option. The
Smart Card is inserted in the mount provided for it (see Fig. 3.1 on page
3-2).

2.9 Indoor-Outdoor communication IOC

With the new series of intelligent Outdoor Units (initially available for 28
GHz), Indoor-Outdoor communication is possible which facilitates the
alignment process at the terminal.

The alignment procedure for an Outdoor Unit with communication device

requires only one service technician who has to go to the antenna mast
only once.

Before starting the alignment process, the system must have been
completely installed and the antenna must be coarsely aligned. When
starting up the modem (reboot), the Outdoor Unit type (system type,
motor-driven WGA, beep generator) is requested. If communication is not
possible, the parameters are taken from the configuration file. Without a
motor-driven WGA or beep generator, the alignment is executed according
to the process previously used.

For a detailed description of the alignment process, please refer to the

Commissioning Manual for the Terminal Station.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Mechanical Design, Interfaces and Maintenance

Chapter 3
Mechanical Design, Interfaces and Maintenance

3.1 RNU4M / RNU8M hardware components

The RNU includes the following components:

— MOD4/8M-IF board
This board is equipped with both the modems and IF Unit.

— ANU4M/8M-PS-DCDC board
This board includes the DC/DC power supply and EDI interface
control circuit.

— Connection Panel Module (CPM) with front panel

For a functional description, please refer to section 2.7. All
versions are depicted overleaf.

— Fan
The fan can be replaced without operational interruption. See
section 3.5 for details on how to proceed.

The operating time of the RNU without fans (during repairs) should
be reduced to a minimum, in order to avoid an overheating of the in-
stalled modules.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
RNU4M / RNU8M hardware components Issue g, 03.2003

equipped
Fan with RNU8M
only

Modem 3 Modem 2

ANU4/8M-PS-DCDC IF Unit
board MOD4/8M-IF board

Mount for
Smart Card
Modem 4 Modem 1

Input LEDs
48 VDC 2 Mbit/s interface connector N-connector
EDI Grounding bolt
access
Handle and Handle
UAI (PC)

Fig. 3.1: Components of RNU4M and RNU8M (top view)

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Front views with interface variants

3.2 Front views with interface variants

The following drawings show the front views of the RNU4M and RNU8M
with all interface variants available and provided by the so-called
Connection Panel Modules (CPMs).

Fig. 3.2: Front views of all interface variants of RNU4M

Fig. 3.3: Front views of all interface variants of RNU8M

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Front views with interface variants Issue g, 03.2003

The ports located in the left-hand and right-hand section of the front panel
are identical for all RNUs. The two drawings below show detailed views of
the left-most and right-most parts of the front panel.

LED (red)

DC 48V
1,3A Fail
Power

LED (green)
Supply
EDI UAI
voltage (PC)
port
input

Fig. 3.4: Ports on the RNU4M and RNU8M (general, left)

Port to ODU
Grounding label (N-Connector)

E1

Grounding bolt
(M8)

Fig. 3.5: Ports on the RNU4M and RNU8M (general, right)

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 RNU interfaces

3.3 RNU interfaces

RNUs are equipped with the following interfaces which can all be accessed
from the front:

— 2 Mbit/s interfaces (2 or 4)
— IF interface to the Outdoor Unit (ODU)
— EDI interface
— UAI / PC interface
— -48 V DC supply voltage
The optical signalling by means of two LEDs is described in section 3.4
below.

The 2 Mbit/s interface supports the following transmission modes:

— 2 Mbit/s unstructured (Mode: transparent)

— 2 Mbit/s structured to G.704 (Mode: PCS)
— 2 Mbit/s fractional (Mode: DMS)
— ISDN primary multiplex access (Mode: S2M)

Electrically, the interface is designed according to G.703. It includes four

signal-carrying connecting cables, i.e. two for the Rx and two for the Tx
direction.

RJ45, Sub-D,
CPM type BNC
Mini-Snap
Impedance 120 Ohms, bal. 75 Ohms, unbal.
Line code HDB3
Bit rate 2.048 Mbit/s ± 50 ppm
Max. cable attenuation 6 dB (1024 kHz)
Frame transparent or to G.704
Cable length 240 m with 0.6 mm conductor diameter

Table 3.A: Specifications of the 2 Mbit/s interface

Depending on the RNU version, this interface is made available via one
RJ45 connector, one 9-pin Sub-D connector, one Mini-Snap connector or
two BNC sockets located on the front panel of the RNU (see Fig. 3.2 and
Fig. 3.3).

The following tables give an overview of the pin assignment of the

individual connector types (except BNC).

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
RNU interfaces Issue g, 03.2003

RJ45 connector

PIN ASSIGNMENT REMARK

1 G.703_in 1a 2048 kbit/s input

2 G.703_in 1b 2048 kbit/s input
4 G.703_out 1a 2048 kbit/s output
5 G.703_out 1b 2048 kbit/s output
3, 6 Ground Inner cable screen
7, 8 n.c. free
GP1, GP2 Ground Chassis ground

Table 3.B: Pin assignment of the RJ45 connector

Sub-D connector

PIN ASSIGNMENT REMARK

1 n.c. free
2 G.703_in a 2048 kbit/s input
7 G.703_in b 2048 kbit/s input
4 G.703_out a 2048 kbit/s output
9 G.703_out b 2048 kbit/s output
3,8 Ground Chassis ground

Table 3.C: Pin assignment of the Sub-D connector

Mini-Snap connector

PIN ASSIGNMENT REMARK

1 G.703_out a 2048 kbit/s output

2 G.703_out b 2048 kbit/s output
3 G.703_in a 2048 kbit/s input
4 G.703_in b 2048 kbit/s input
Hülle Ground Chassis ground

Table 3.D: Pin assignment of the Mini-Snap connector

1 4

2 3

Fig. 3.6: Arrangement of pins of the Mini-Snap connector (female)

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 IF interface to the Outdoor Unit (ODU)

3.3.1 IF interface to the Outdoor Unit (ODU)

This interface is used to connect a customary angular N-connector with a
coaxial cable (IF cable) leading to the Outdoor Unit. This cable carries both
the Tx signal and Rx signal as well as the supply voltage required by the
Outdoor Unit (20 V DC). The N-connector port is located in the right-hand
section of the front panel.

3.3.2 External Device Interface (EDI)

The External Device Interface (EDI) of the RNU is composed of five
signalling inputs which can be used to connect external units (e.g.
BSU100C, mains adapter, alarm contacts of door switches or smoke
sensors etc.), a power supply source for powering the external signalling
contacts (auxiliary voltage) as well as a floating control output.

This interface is made available on the front side of the RNU via a 15-pin
Sub-D connector.

Signalling inputs

The inputs are galvanically isolated from the internal connections of the
RNU by means of optocouplers. The voltage applied to the input must lie
between 20 V DC and 60 V DC. The typical input voltage used is 24 V DC
or 48 V DC, the maximum current being 3 mA.

The inputs are software-configurable as NO or NC contacts. Alarms

available at the inputs are displayed by the INCO software and are passed
on to the ’ServiceOn Access’ Network Management System or SECO
software. Thus, externally connected units can be monitored by the
Network Management System.

Alarms received at signalling inputs 1 to 4 are spontaneously signalled to

the Network Management System, while alarms available at signalling
input 5 must be explicitly requested.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
External Device Interface (EDI) Issue g, 03.2003

Configured as NO contact
External unit RNU4M/8M ’Service On Access’

Auxiliary voltage

No alarm

Auxiliary voltage

Alarm

Configured as NC contact
External unit RNU4M/8M ’Service On Access’

Auxiliary voltage

No alarm

Auxiliary voltage

Alarm

Fig. 3.7: Alarm signalling via the EDI signalling input (schematic drawing)

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 External Device Interface (EDI)

Auxiliary voltage

The -24 V DC auxiliary voltage is exclusively used to supply the signalling

inputs as depicted above.

The power supply source is short-circuit-proof with a 20 mA current limiter.

The length of the cable connected must not exceed 2 m.

The positive pole of the power supply is connected to chassis ground.

Switching output

The switching output (control line) can be used as NO or NC contact. It is

triggered by the ’ServiceOn Access’ Network Management System. The
relay contacts can separate DC voltages up to 60 VDC. The maximum DC
switching power is 30 W, whereas with an AC voltage it is 62.5 VA. A
maximum permanent current of
100 mA (inductive load) is permitted.

RNU4M/8M ’Service On Access’

NC contact (11) Relay Driver

NO contact (13)
Base (12)
OFF

NC contact (11) Relay Driver

NO contact (13)
Base (12)
ON

Fig. 3.8: EDI control line in both switching statuses (schematic drawing)

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
UAI interface (PC) Issue g, 03.2003

Pin assignment of the EDI interface

PIN SIGNAL REMARK

1 MEP1 Signalling line 1 (positive)
2 MEP4 Signalling line 4 (positive)
3 MEP2 Signalling line 2 (positive)
4 MEP5 Signalling line 5 (positive)
5 MEP3 Signalling line 3 (positive)
6 Ground Chassis ground
7 Geb13 Control line, NO contact
8 Geb11 Control line, NC contact
9 MEN1 Signalling line 1 (negative)
10 MEN4 Signalling line 4 (negative)
11 MEN2 Signalling line 2 (negative)
12 MEN5 Signalling line 5 (negative)
13 MEN3 Signalling line 3 (negative)
14 UZug Auxiliary voltage
15 Geb12 Control line - Base
Table 3.E: Pin assignment of the EDI interface

3.3.3 UAI interface (PC)

This interface is implemented by a 9-pin Sub-D connector. Its electrical
features are in compliance with the RS232 interface definition. The PC is
connected via a zero-modem cable.

The UAI (PC) interface is connected to the OAM switch which permits each
of the modems* included to be accessed by the Service PC (also see
section 2.4 on page 2-11).

3.3.4 Supply voltage -48 V DC

The -48 V DC power supply port is located in the left-hand section of the
front panel. The polarity is indicated on the front panel. The positive pole
must be grounded.

1 2

X1

- +
Fig. 3.9: Pin assignment of the power supply port

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Optical signalling (LEDs)

3.4 Optical signalling (LEDs)

The two LEDs (Fail and Power) on the RNU front panel indicate the statuses
listed in the following table:

LED STATUS MEANING

All voltages required are available and all modems
ON
are operational.
Power All voltages required are available, no electrical
(green) flashing defect. However, at least one modem is not
operational (e.g. boot hang-up)
OFF RNU not operational / voltage missing
ON Fault: Equipment not operational
Fail No network access, i.e. no connection between the
flashing
(red) RNU and Base Station via the radio link.
OFF No error
Table 3.F: Optical signalling of the RNU

3.5 Maintenance
The RNU is maintenance-free. Only a faulty fan has to be replaced. This is
possible without opening the RNU and without operational interruption.

The fan is located in the left rear part of the RNU (see Fig. 3.1). To replace
a faulty fan, proceed as follows:

— Remove the fan cover screws on the rear side of the RNU.

— Cautionously pull the fan out of the RNU housing.

— Disconnect the fan from the ANU4M/8M-PS-DCDC module.

— Connect the new fan to the ANU4M/8M-PS-DCDC module.

— Mount the fan in its usual place.

— Secure the fan by means of screws.

Never touch the propeller of a running fan! This could not only dam-
age the fan but lead to serious danger of injury!

The operating time of the RNU without fan (during repairs) should be
limited to a minimum, in order to avoid an overheating of modules.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Maintenance Issue g, 03.2003

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Installation

Chapter 4
Installation

4.1 Mounting the RNU4M / RNU8M

4.1.1 General
These RNUs are appropriate for being mounted in a 19“ rack or in an ETS
rack using additional flanges. However, they can also be wall-mounted or
operated as desktop units.

All mounting material such as rubber feet, plates, mounting brackets,

screws and spacers - except the material required for wall mounting - is
included in the delivery scope.

For wall mounting, the special wall-mounting kit is additionally required

(see section 4.1.6). In addition to the necessary material, this mounting kit
also includes the mounting instructions and a drilling template for the
necessary boreholes.

The following drawing shows the top view of the RNU prepared for being
mounted in an ETS rack. The flanges on the left-hand and right-hand side
required for installation in a 19“ rack are installed. The flange brackets also
provide handles for holding the RNU. The additional flanges required for
installation in an ETS rack are mounted onto the flange brackets.

Flange bracket Flange bracket

Additional flange Additional flange

for ETS rack for ETS rack

Handle Front Handle

Fig. 4.1: Top view of the closed RNU

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Preparatory measures Issue g, 03.2003

4.1.2 Preparatory measures

— Define the mounting position in the rack.

— In the corresponding position, screw four cage nuts into the

rack.

— Verify that the packaging is not damaged.

— Remove the packaging.

Note: Ensure that the packaging material is disposed of

according to the relevant regulations.

4.1.3 Installation in a 19“ rack

Note: In the as-delivered state, the lateral flange brackets are
pre-mounted for installation in a 19“ rack.

Proceed as follows:

— Mount the RNU in the 19“ rack.

— Secure the RNU in position by means of four screws (M6x16)

and four spacers.

4.1.4 Installation in an ETS rack

In order to install the RNU in an ETS rack, additional flanges have to be
screwed onto the flange brackets (see Fig. 4.1). These additional flanges
and screws are included in the delivery scope.

— Mount the RNU in the ETS rack.

— Secure the RNU in the rack using four screws (M6x16) and four
spacers.

4.1.5 Using the RNU as desktop unit

The RNU can also be used as desktop unit. In this case, the four rubber
feet included in the delivery scope must be mounted to the bottom plate of
the RNU.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Wall mounting

4.1.6 Wall mounting

For wall mounting, a special mounting kit must be separately ordered:

DESIGNATION IDENT. NO. PART NO.

Mounting Kit Wall 62.7037.424.00-A001 AN00214122

Prerequisites

— The wall must be even and clean.

— The distance to side walls must be at least 30 cm for cooling and

accessibility reasons (see Fig. 4.2 and Fig. 4.3).

For wall mounting, the two mounting brackets included in the special
mounting kit must be attached to the left and right side of the RNU using
the four short screws (M6x10).

Using the template, bore four holes into the wall. Insert dowels and mount
the RNU unit by means of four screws.

Wall-mounting is permitted only with the RNU front panel pointing to

the left or right (see Fig. 4.2 and Fig. 4.3).

If the right side panel of the RNU unit has ventiducts, wall-mounting
must be executed in such a way that these holes are not pointing
down. In this case the unit can be mounted only with the front panel
pointing to the right.

To protect the front-side connectors, a cover plate can be provided. This

cover can be lead-sealed to avoid unauthorized access to the unit.
The cables are fed through the lateral opening of the cover.

The cover must be mounted in such a way that the front-panel LEDs
of the RNU are visible through the cover openings.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Wall mounting Issue g, 03.2003

The following two drawings show the wall-mounting options of the RNU.

top

Wall Wall

Cover

Front

at least 30 cm at least 30 cm

bottom

Fig. 4.2: Wall mounting the RNU with front panel pointing to the right

top

Wall
Wall

Front

at least 30 cm at least 30 cm

Cover

bottom

Fig. 4.3: Wall mounting the RNU with front panel pointing to the left

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Cabling

4.2 Cabling
4.2.1 Grounding
Grounding at the RNU grounding bolt

The grounding point (grounding bolt) is located in the right-hand section of

the RNU front panel (see Fig. 3.4 on page 3-4).

When the RNU is operated as a wall-mounted or desktop unit, the

grounding cable must be connected to this grounding bolt.

In Germany, this grounding cable must have the following minimum

diameters:

— at least 2.5 mm2 in case of protected laying

— at least 4 mm2 in case of unprotected laying

Connection to chassis ground

If the RNU is mounted in a rack (19“ or ETS), grounding via the grounding
bolt is not absolutely necessary provided that the unit is screwed to the
rack in such a way that there is a conductive connection to the rack and
the rack itself is grounded according to the relevant regulations.

To guarantee a conductive connection between the unlacquered rack

upright and the RNU mounting flanges, the screw connection between the
RNU flange and rack flange must be set up using an outer tooth-lock
washer. In addition, the screw connection must be carefully and well
tightened. This ensures a gas-tight connection between the equipment
flange and rack flange.

Note: The screw connection set up using a tooth-lock washer

must be clearly identified as grounding point by means of an
appropriate label!

Grounding must comply with the relevant local and national stan-
dards and regulations!

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Power supply connection Issue g, 03.2003

4.2.2 Power supply connection

The RNU is operated with a nominal supply voltage of -48 V DC.

The connection of the supply voltage is set up via the RNU front-panel
connector (see Fig. 3.4 on page 3-4).
This connector must be secured by means of two screws in order to avoid
unintentional disconnection.

Connect or disconnect the power supply cable only with the supply
voltage switched off.

4.2.3 2 Mbit/s interface

Depending on the RNU version, RJ45, Sub-D, Mini-Snap or BNC connec-
tors are made available for connecting the terminating units.

4.2.4 External Device Interface (EDI)

The EDI connector located on the RNU front panel can be used to connect
external devices such as a door contact, smoke sensor etc.. For more
detailed information, please refer to the description of the EDI interface in
section 3.3.2 on page 3-7.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Connecting the Outdoor Unit

4.2.5 Connecting the Outdoor Unit

Before connecting the IF cable, both the cable and RNU must have
been grounded in compliance with the relevant regional and natio-
nal regulations!

The connection between the RNU and Outdoor Unit is set up via a coaxial
cable. On the RNU, the cable is connected to the front panel via a 90o
N-connector (see Fig. 3.5 on page 3-4).

Please observe the following regulations:

— Note the maximum length and minimum bending radius which

depend on the cable type used.

— Never lay the cable parallelly to power cables (minimum

distance to power cables: 10 cm).

Note: In Germany, the IF cable must be grounded every 20 m

in compliance with VDE 0855.
In all other countries, the relevant country-specific regulations
must be observed.

Note: With RNU4M/RNU8M versions determined for MDMS

26 GHz, use the extended-power version of the ODU!

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
Connecting the Outdoor Unit Issue g, 03.2003

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Commissioning the RNU4M / RNU8M

Chapter 5
Commissioning the RNU4M / RNU8M

5.1 On-site commissioning

The commissioning process of the RNU4M / RNU8M is performed using a
Service PC with INCO software. Remote configuration modifications and
downloads of new software can be carried out subsequently using the
’ServiceOn Access’ Network Management System or SECO software (for
configuring the Radio Base Station).

The Service PC is connected via the UAI (PC) port located in the left-hand
section of the front panel (see Fig. 3.4 on page 3-4) via a zero-modem
cable.

An unambiguous hardware identification is possible using the modem ID.

When starting up the INCO, the remote inventory data (RID), which also
include this modem ID, are read out and displayed. However, for logistic
reasons, the modem ID of each unit is also indicated on an adhesive label
located in the upper right corner of the front panel (see Fig. 3.5 on page
3-4).

If IOC-supporting hardware is used (for Indoor-Outdoor communication),

the alignment process can be executed by only one service technician. In
this case, the WGA is automatically adjusted and the ODU is aligned by
means of acoustic signals (beep generator).

For a detailed description of the RNU4M/8M commissioning process,

please refer to the Commissioning Manual for the Terminal Station.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
QD2 functional model of the RNU4M / RNU8M Issue g, 03.2003

5.2 QD2 functional model of the RNU4M / RNU8M

The ’ServiceOn Access’ Network Management System uses the QD2
specification for network elements.

The following diagram shows the QD2 functional model of a 2 Mbit/s path
with the corresponding functional groups.

*RNU4M/RNU8M composed of four modems

Fig. 5.1: QD2 functional model of the RNU4M / RNU8M

The complete QD2 schematic of an RNU4M includes twice the model

depicted above, whereas that of an RNU8M includes four times this model.

The IF Unit functional group represents the IF stage of the MDMS system.
It consists only of the IF functional block. Here the corresponding alarms
are displayed and the basic configuration data for frequency management
are entered.

The RF Unit functional group represents the RF stage of the MDMS

system. It displays, for example, the Rx and Tx frequency. This functional
group consists only of the RF functional block.

The Modem functional group is composed of several functional blocks.

The following diagram (Fig. 5.2 on page 5-3) shows the functional scheme
of the Modem viewed from the Network Management System. This
diagram gives an overview of the functional blocks of the modem.

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 QD2 functional model of the RNU4M / RNU8M

&'1,' 0RGHP7;

TP index=2 TP index=1
(33 '&73 0RGHP6WDWH &73 $1
(33177

0RGHP5;

Static connectivity Static connectivity

Fig. 5.2: QD2 functional scheme of the modem

The CDN-ID functional block includes the address of the respective

modem. This address is required for an unambiguous identification in the
Base Station.

The CTP and D1CTP are only connecting blocks (interfaces) and do not
provide any other function. EPP2 represents a 2 Mbit/s interface.
EPP2NT-T is an interface of the same type. It additionally provides the NT
functionality.

The Modem Tx, Modem Rx and Modem State functional blocks transmit
information to the Network Management System which is displayed there.
The information displayed can be both spontaneous messages or replies
to requests from the Network Management System.

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
QD2 functional model of the RNU4M / RNU8M Issue g, 03.2003

The following table gives an overview of the modem application functions:

Spontaneous
Application functions Request / reply Command
message

Alarm information X X -
Alarm disabling and priority X X X
Configuration X X X
Current performance data - X -
15-min. performance data - X -
24-h performance data - X -
PM configuration X X X
Sampling parameters X X X
Measuring values X X -
Operating status X X X
Reference list - X -

Tab. 5.A: Modem application functions

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AN00236122 RNU4M/RNU8M Equipment Description and Mounting Instructions
Issue g, 03.2003 Technical Characteristics

Chapter 6
Technical Characteristics

6.1 Environmental conditions

Operation ETS 300 019 (T/TR02-12), environment class 3.2
Storage ETS 300 019 (T/TR01-12), environment class 1.1
Transport ETS 300 019 (T/TR01-12), environment class 2.1
Mechanical requirements ETS 300 019
Electromagnetic compatibility ETS 300 385 (FTZ 1 TR9)
Electrical safety EN 60950

6.2 Mechanical data

Width 450 mm
Dimensions Height 44.45 mm
Depth 240 mm
Weight 3.8 kg

6.3 Electrical data

6.3.1 Equipment
Supply voltage -48 VDC nominal (36 .. 60 VDC)
Max. power consumption
(with splitter network and RNU4M/RNU8M: 72 W (1.5 A at -48 VDC)
extended- power ODU)

6.3.2 2 Mbit/s interfaces

Interface standard
Standard ITU-T G.703

Connector type (for each 2 Mbit/s interface)

RJ45
Sub-D 120 Ohms, balanced
Mini-Snap
BNC 75 Ohms, unbalanced

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RNU4M/RNU8M Equipment Description and Mounting Instructions AN00236122
EDI interface Issue g, 03.2003

6.3.3 EDI interface

Floating signalling inputs

Number of signalling inputs 5
Nominal input voltage 20 .. 48 V DC (SELV circuits acc. to EN60950)
Maximum input voltage 60 V DC
Nominal input current (approx.) max. 3 mA (at 60 V)
High identification threshold 20 V DC

Floating switching output (relay contacts)

Number of switching outputs 1 (with NO and NC contact)
Max. switching voltage 60 V DC (SELV circuit acc. to EN60950)
Switching power 30 W at 62.5 VA
Max. permanent current 100 mA (inductive load)
Max. shutdown current 1 A (inductive load)

Auxiliary voltage (permanently short-circuit-proof)

Auxiliary voltage -24 V DC
Output current max. 20 mA
Cable length max. 2 m
Reference pole Chassis ground

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