A L C T E L

Alcatel OmniPCX 4400

SECTION 7

RT2 connection

Ed.02
 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection

Section 7 - RT2 connection

SUMMARY

RT2 connection
General information ....................................................................................... 7. 3
1. General .................................................................................................. 7. 3
2. Reference to related modules................................................................ 7. 4
Functional description ..................................................................................... 7. 5
1. Duplication of the T2 link....................................................................... 7. 5
2. B channel reservation............................................................................ 7. 5
3. INT and RT2 combination ...................................................................... 7. 6
4. Synchronisation...................................................................................... 7. 6
5. Tones, voice guides and music on hold ................................................. 7. 6
6. Trunks .................................................................................................... 7. 7
7. US shelf .................................................................................................. 7. 7
8. Attendant ............................................................................................... 7. 7
9. Voice mail............................................................................................... 7. 7
10. Callbacks.............................................................................................. 7. 7
11. Software description ........................................................................... 7. 7
Installation ...................................................................................................... 7. 9
1. Generality .............................................................................................. 7. 9
Management ................................................................................................... 7.11
1. Principle ................................................................................................. 7.11
2. Declaring the operating mode of the node........................................... 7.11
3. Declaring the remote ACT ..................................................................... 7.11
4. Declaring the rt2-a board: .................................................................... 7.12
5. Declaring the RT2-B board .................................................................... 7.12
6. Consulting the states of the boards ...................................................... 7.13
Maintenance.................................................................................................... 7.15
1. Flashing and downloading procedure ................................................. 7.15
2. Maintenance commands........................................................................ 7.15

Ed.02 Ref.3BA19919ENAA 7.1

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection

7.2 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
General information

44A01112010A000AAEN

RT2 connection
General information
Edition: 02

1. General

The RT2 board was developed to connect the main ACT to a remote (or peripheral) ACT via a 2048
Kb/s T2-type (PCM) link.

The RT2 link carries out a function which is similar to the INT link. However, the RT2 link permits
an unlimited distance (leased or private line with repeaters) between main ACT and remote ACT; the
capacity of this link in terms of simultaneous communications is lower (30 maximum).

The physical support of the link may be:

- a copper line with or without DLT (Digital Line Transmitter) repeater,

- an optic fibre via the OLDT (Optical Line Digital Transmitter) board.

The RT2 link is created using two RT2 boards. One is installed in the main shelf and acts as a coupler
(feature A). The other is installed in the peripheral shelf and acts as a CPU (feature B). The RT2 which
has feature A is called RT2-A, and the one which has feature B is called RT2-B.

There are 2 versions of this board: RT2 and RT2-1.

In the RT2 version, the role of the board is given by the position of the jumpers.

In the RT2-1 version, the role is recognised automatically.

The name URAD (or remote ACT) is sometimes used to designate the remote ACT.

Ed.02 Ref.3BA19919ENAA 7.3

 A L C T E L

Alcatel OmniPCX 4400

RT2 connection Section 7 - RT2 connection
General information

Figure 1 : main ACT and remote ACT connected by RT2

Main ACT

T2 link
on private or leased line
with or without DLT

Remote ACT

2. Reference to related modules

RT2 CONNECTION is described in the following modules:

- Functional description (See module RT2 connection - Functional description ),

- Management(See module RT2 connection - Management ),

- Installation (See module RT2 connection - Installation ),

- Maintenance(See module RT2 connection - Maintenance ).

7.4 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
Functional description

44A01112010A042AAEN

RT2 connection
Functional description
Edition: 02

1. Duplication of the T2 link

Figure 2 : Principle of the duplicated RT2 link

CPU

Main A.C.T.

RT2
RT2

2 T2 links

RT2
RT2

Remote A.C.T.

The inter-ACT link may be duplicated for security reasons. Four RT2 (or RT2-1) boards are therefore
needed. The RT2–B boards occupy the same position in the main CPU and the backup CPU.
When both links are valid, the system uses the resources of both connections (the communication
capacity is doubled).
If the link (link + RT2-A and RT2-B) which provides the master CPU feature fails, the other link takes
over and the CPU feature switches over from one link to another.

2. B channel reservation

The RT2 link has two operating modes: with or without B channel reservation.
Without B channel reservation:
When an RT2 link B channel is to be used, the system does not reserve the channel. Therefore, in the
event of saturation, a set may ring, yet when off-hooking the user hears the busy tone. This operating
mode is not recommended.
With B channel reservation:
When an RT2 link channel is to be used, the system immediately reserves the B channel required. In
the event of saturation, the user receives a congestion message. In some cases, the service requires a
channel which is not offered.

Ed.02 Ref.3BA19919ENAA 7.5

 A L C T E L

Alcatel OmniPCX 4400

RT2 connection Section 7 - RT2 connection
Functional description

The operating mode is selected by configuration.

3. INT and RT2 combination

An RT2 shelf may be installed behind a peripheral shelf.

Therefore, we may have an architecture over 3 levels:

Figure 3 : 3–level architecture

CPU

INT INT link INT

RT2 (or INTOF) RT2

RT2 link RT2 link

RT2 RT2

Main shelf level 1 Peripheral shelves, level2 Peripheral shelf level 3

Level 3 peripheral shelves may not be connected to RT2 shelves.

Level 4 peripheral shelves are not possible.

4. Synchronisation

The RT2 link transports the synchronisation. The clock which is extracted from this link is taken into
account in the peripheral ACT or the main ACT according to the “Synchronisation priority” defined in
management.
Warning: Some RT2 links may be fitted with Digital Line Transmitters or multiplexers which only
transmit the clock when a call is in progress on this link. The administrator must check that these
links are not synchronising.

5. Tones, voice guides and music on hold

The RT2-B board has its own tone generator for local ACT requirements. A VG (or SU-VG) board is
required in the remote ACT for this ACT to have voice guides. If there is no VG board the guides are
replaced by tones.
External music may only be connected to the remote ACT via a Z-type analog link.

7.6 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
Functional description

6. Trunks

The remote ACT may support trunks. In this case, the subscribers of this ACT must use these trunks
as a priority. These trunks may also be synchronising. However, these trunks may not support ABC
logical links.

7. US shelf

A remote ACT may support the US shelves and the SU-VG or SU boards.

8. Attendant

The attendant may be connected to either the main ACT or the remote ACT.

On i/c, calls to the attendant (transiting by the RT2 link) do not reserve any channels in call phase.
However, a quota of 4 channels is dedicated to the attendant on i/c. In practice this is enough to
ensure that the attendant may always be contacted.

9. Voice mail

The voice mail may only be in the main ACT. The remote ACT’s subscribers may access it. A TS is
seized on the RT2 link when a remote ACT subscriber connects.

If no channels are available to contact the voice mail it is declared “Unavailable”.

10. Callbacks

The automatic callback is only offered if the call fails because the RT2 link is saturated.

For the groups: the callback or camp-on is offered if no group members are available because they
are all busy or the RT2 link is saturated.

Before making a callback, the system reserves the B channels required. The callback is deferred if the
reservation fails.

11. Software description

The remote ACT application is based on the T2 interface and the Lap D protocol which secures the
transmission.

Ed.02 Ref.3BA19919ENAA 7.7

 A L C T E L

Alcatel OmniPCX 4400

RT2 connection Section 7 - RT2 connection
Functional description

Figure 4 : Software distribution diagram

to CPU "Coupler" "CPU"

simulation simulation
software to the remote
part ACT coupler
Lap D Lap D

hadware
T2 interface T2 interface
part

RT2-A RT2-B

main A.C.T. remote A.C.T.

7.8 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
Installation

44A01112010A560AAEN

RT2 connection
Installation
Edition: 02

1. Generality

The configuration of the RT2 and RT2-1 boards is described in the RT2 Configuration module (see
module RT2-1 board - Configuration).

Ed.02 Ref.3BA19919ENAA 7.9

 A L C T E L

Alcatel OmniPCX 4400

RT2 connection Section 7 - RT2 connection
Installation

7.10 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
Management

44A01112010A160AAEN

RT2 connection
Management
Edition: 02

1. Principle

To create an RT2 link, you must:

- declare the operating mode of the node,

- declare a remote ACT,

- declare an RT2-A board in the main ACT,

- declare an RT2-B board in the main ACT.

2. Declaring the operating mode of the node

Object name: System > Other System Param.

Booking B Channel : determines whether or not B channels are reserved in call phase
for the whole node.

3. Declaring the remote ACT

Object name: Shelf

Node Number : Enter the number of the node where the ACT is located.
Shelf Address : Enter the number of the ACT.
Shelf Type : Select the type of shelf. All the shelf types are suitable for a shelf
connected by an RT2 link.
ACT Type : Select “Peripheral ACT Shelf”.
Stand By CPU : no

Ed.02 Ref.3BA19919ENAA 7.11

 A L C T E L

Alcatel OmniPCX 4400

RT2 connection Section 7 - RT2 connection
Management

Signalling Mode : This attribute is used to select the signalling mode used between
the peripheral ACT shelves and the main ACT:

-TS16 (default position) enables the transfer of the signalling on

TS16 of the link between RT2-A and RT2-B. This is the only mode
possible for this type of shelf.
Signalling Channel N64 : not significant.
Size

4. Declaring the rt2-a board:

Object name: Shelf > Board

Node Number : Enter the number of the node where the ACT is located.
Shelf Address : Enter the No. of the local ACT.
Board Address : Enter the position of the board.
:
Interface Type : Select "RT2A".
Country Protocol Type : Not significant.
Remote Shelf Address : Enter the No. of the ACT at the other end of the RT2 link.
Remote Board Address : Enter the No. of the board at the other end of the RT2 link.
Synchronisation Priority : Enter the level of priority for the acknowledgement of the clock
extracted from the RT2 link.
Voice-->Data TS : Not used.

5. Declaring the RT2-B board

Object name:Shelf > Board

Node Number : Enter the number of the node where the ACT is located.
Shelf Address : Enter the ACT No.
Board Address : Enter the position of the board.

Interface Type : Select "RT2B".

Country Protocol Type : Not significant.

7.12 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
Management

Remote Shelf Address : Enter the No. of the ACT at the other end of the RT2 link.
Remote Board Address : Enter the position of the board at the other end of the RT2 link.
Synchronisation Priority : Enter the level of priority for the acknowledgement of the clock
extracted from the RT2 link.
Voice-->Data TS : Not used.

Declaring the duplicated links

The two RT2-A boards and the two RT2-B boards must be defined without making any specific decla-
ration. The system understands whether a main link or a backup link is used.

6. Consulting the states of the boards

In consultation the administrator may find out the state of the RT2 board.
Object name:Shelf > Board

Node Number : Enter the number of the node where the ACT is located.
Shelf Address : Enter the ACT No.
Board Address : Enter the position of the board.

Interface Type : RT2A or RT2B depending on the case.

Usage State : Not significant.
Operational State : In service or out of service depending on the case.
Main/Standby State : Principal (master) or Standby (slave) depending on the case,

CAUTION: pay attention to the duplicated links.

In the main ACT the two RT2A boards are always seen as
Principal (master).

In the peripheral ACT only the RT2B board which acts as the
main CPU is seen as Principal (master). The other RT2B board is
seen as Standby (slave).
Country Protocol Type : Not significant.
Remote Shelf Address : No. of the remote ACT at the other end of the RT2 link.
Remote Board Address : No. of the board at the other end of the RT2 link.
Synchronisation Priority : Indicates the synchronisation priority.
Voice-->Data TS : Not used.

Ed.02 Ref.3BA19919ENAA 7.13

 A L C T E L

Alcatel OmniPCX 4400

RT2 connection Section 7 - RT2 connection
Management

7.14 Ref.3BA19919ENAA Ed.02

 A L C T E L

Alcatel OmniPCX 4400

Section 7 - RT2 connection RT2 connection
Maintenance

44A01112010A400AAEN

RT2 connection
Maintenance
Edition: 02

1. Flashing and downloading procedure

The RT2 board uses the "binrt2" software which is installed in the flash memory. The new software is
downloaded from the CPU (whatever the position of the RT2–A or RT2–B coupler) during a change of
version or after accidental destruction.

The download operation is carried out automatically.

The RT2 board has a boot in its flash memory to carry out the download. This is deleted when the flash
memory is reset to zero (the flash memory cannot be partially reset). It is restored by the download.
However, the boot is lost if a reset occurs during this brief time interval. It must then be restored.

The download operation is carried out automatically.

Boot recovery procedure

When the boot is lost, it may be recovered by inserting the specific EPROM in the dedicated mother
board connector. The X13/X15 jumpers must be positioned in “boot on EPROM” position. Then insert
the board in the shelf. The boot is copied automatically.

CPU led (during the boot recovery)

Fixed glowing During initialisation (3s)

800 ms on / 800 ms off Flash deletion

50 ms on / 50 ms off Flash programming

190 ms on / 190 ms off Programming terminated

Fixed glowing (after deletion and prog) Programming error

2. Maintenance commands

The standard maintenance commands are available on the RT2 coupler. The maintenance commands
intended to monitor the “INT” link are also available for the RT2 link.

Ed.02 Ref.3BA19919ENAA 7.15