DM2+ Flexible
voice and data multiplexer
The DM2+ is a member of the Nokia Dynanet family of multiplex,
branching, cross-connect and line equipment. A dynamically
controllable primary multiplexer utilising Dynanet channel unit
selection, it has enhanced flexibility and efficient upgradability.
The DM2+ represents the first stage of European digital
multiplexer hierarchy.
Technical Highlights
Any mix of voice and data interfaces
using the wide selection of Dynanet
channel units
Easy adaptability to future services
Satisfies ETSI Open Network Provision
requirements for leased line networks
One-way digital branching
Decentralised powering for extra
reliability.
Local or remote control of equipment
parameters
Centralised network management
Several installation options
Applications
Basic concept
The DM2+ was designed for multiplexing analogue speech and signalling as
well as data channels of different bit
rates into a common 2 Mbit/s frame.
It can be used:
as a traditional PCM multiplexer in
subscriber and junction line networks;
in corporate networks to provide a
full range of voice, ISDN and data
services;
as one-way branching equipment to
enable the efficient use of channels
in rural areas or in private networks;
for efficient data multiplexing, e.g.,
X.58 and V.110 on low bit rates.
The heart of the equipment is a MUX
unit which is common to all channel
and special units of the DM2+ system.
The MUX unit communicates through a
2 Mbit/s internal bus with the tributary
units and carries out the 2048 kbit/s
framing according to ITU-T G.732 standard.
Specific features
The allocation of an Embedded
Operations Channel (EOC), or Service
Channel, into any vacant time slot in
a 2 Mbit/s aggregate can be used to
extend the Nokia Q1 management
bus. This can be done using the Service Terminal when time slot zero is
not available, for example when using
the Leased Line network. The DM2+
satisfies the Open Network Provision
requirements for leased line networks.
Dynanet channel units
Analogue and digital services are
realized with interface-specific channel
units that connect to the Dynacard bus.
The channel units contain from one to
ten VF, data or ethernet channels.
One-way branching
The DM2+ can be equipped with one
of several 2 Mbit/s Dynanet channel
units to provide efficient digital one-way
branching in chain and tree networks.
Channels from different sites can be
freely and dynamically combined into a
common 2 Mbit/s frame. The dynamic
allocation provides the possibility to
change branching configurations during normal operation. This allows the
flexible utilisation of transmission capacity in rural and corporate networks.
The channel allocation information
can be changed manually by using
the Nokia Service Terminal, or automatically, based on alarms or time
of day by using the Nokia Network
Management System (NMS).
voice and data channel unit settings
and configuration;
level settings;
balancing network settings;
impedance settings;
setting of signalling and data
interface parameters;
signal quality measurements.
Integrated supervision with
versatile programming
The software-controllable concept
enables a powerful method for configuring the equipment, e.g. changing
channel gains or selecting data channel speeds. The allocation of time slots
to individual channels, for easy routing,
can also be done by software control.
All operations can be done locally or
remotely. The settings are stored in a
non-volatile memory, retaining information even in powerdown conditions.
The facilities include the following:
accurate alarm indication;
time slot selection;
one-way branching of channels;
Technical Data
Product codes
Main characteristics
Electrical Interfaces
21116
21117
21147.02
21147
Mechanical Dimensions
Environmental specifications
The Dynanet installation concept
offers flexible installation options in
wallmounting cases (4-and 8-slot
subracks) and 19 racks. The units can
be placed freely in any vacant unit
space also of other applicable Dynanet
units, so flexibility of the configuration
can be increased.
DM2+ Multiplexing Unit 75/120 ohm
DM2+ Multiplexing Unit 75 ohm
Program E TC21116/TC21117 G826
Program E/ TC 21116/21117
G.703, G.704, G.732, G.735, G.711, G.736, G.823
2048 kbit/s
8
32
30 (31)
16
synchronous 32 kbit/s time-slot interleaving
2048 kbit/s
ITU-T Recommendations
Bit rate
Code
Pulse shape
Peak voltage/impedance
Peak voltage tolerance
Pulse width
Input signal attenuation
Number of 2 Mbit/s interfaces
G.703, G.823
2048 kbit/s 50 ppm
HDB3
Rectangular
3V/120 ohms, 2.37V/75 ohms
10%
244 +/- 20ns
0 to 6 dB at 1024 kHz
Limited by subrack space only
Number of VF and data units
Power Feeding
Flexible installation
ITU-T recommendations
Bit rate
Bits per time slot
Time slots per frame
Time slots for voice and data
Frames per multiframe
Multiplexing
VF and data
Other interfaces
Centralised network management is
offered by the Nokia Network Management system NMS. For this purpose a
built-in data channel is provided in the
frame structure.
Service interface
Auxiliary data channel
Programmable E&M alarm
outputs
active state
passive state
Interface units of the DYNANET family are
detailed in separate leaflets
Limited by subrack space only
75-9600 bit/s, V.11 ITU-T
600-2400 bit/s, V.11 ITU-T
1 < 5 mA, U dc < 2 V
1 < 5 A, 0 > U dc > -12 V
Central battery voltage
Power consumption
MUX unit only
30 ch E&M multiplexer 10 W
20...72 VDC
NDM 19 subrack
(16 plug-in units)
NDM 8-slot subrack
(7 plug-in units)
NDM 4 slot subrack
(4 plug-in units)
Height
297 mm
Width
450 mm
Depth
222 mm
322 mm
112 mm
218 mm
Operation
Electromagnetic compatibility (EMC)
Copyright 2007 Nokia Siemens Networks. All rights reserved.
SURPASS is a trademark or a registered trademark of Nokia Siemens Networks.
Other company and product names mentioned herein may be trademarks or
trade names of their respective owners.
3W
297 mm
225 mm
214 mm
ETS 300 019, Class 3.1E
ETS 300 386 (2000)
www.nokiasiemensnetworks.com
