How to Simulate SS7-ISUP Protocol over E1 or T1 Interface

Simulation on the SS7 protocol is carried out according to the connection of the TS's allocated to SS7 Channels defined in the profile.

The Clarinet Book USB E1/T1 which simulates the Signalling Point, uses the B port "From Network".

The Clarinet-Book can be connected to the E1 interface in:

Extremity mode over E1. Clarinet inputs set as 75, 120 Ohms. See: wiring , connect, pin-out

The Clarinet-Book can be connected to the T1 interface in:

Extremity mode over T1 with clarinet inputs set as 100 Ohms. See: wiring , connect, pin-out

A new profile can be created with the Wizard from the Template list by selecting:

Profile->New->SS7......See: building a test
Profile with a description including SS7, simu ISUP , PH=E1 or PH=T1
Filter with a description including SL, DL=SS7

Profiles resulting from the wizard are ready for SS7 simulation over two channels.

Channel 2 is configured as active: Generator and Responder behaviour are selected:
- The MTP2 layer will automatically be activated to reach the state 'In service'.
- One IAM message is generated after a delay of 1 second.
- All Received IAM messages are replied by sending ACM+ANM messages after a delay of 5 seconds
Channel 1 is configured as inactive: Generator and Responder behaviour are de-selected
- The MTP2 layer will not align.

Optional modifications to apply to the profile:

E1 Options: CRC4 multi-frame if CRC4 is used on the interface.
T1 Options: ESF/SF multiframing,.....
Interface Specs...->Physical Level: by default the clock source uses the Internal Clock

All conditions are set in the profile for the emulation and simulation over Channel 1.

The behaviour is activated:

Select: Behaviour of 1st channel
Tick the box next to Generator: The communication #1 which is selected will generate one IAM.
Tick the box next to Responder: Incoming calls will receive the reply ACM, CPG & ANM by default which may be edited in the Responder panel.

The default TS's allocated to the SS7 channels are #16 (Channel 1- SL) and #1 (Channel 2- DL) .

Channel 1: In the profile go to Interface-Spec... ->Signalling Link :

Channel 1: In the profile go to Interface-Spec... ->Data Link :

Each of the Channels C1 and C2 have their own set of parameters.

Circuit values: In the profile go to Emulator Config. ->ISUP
- Replace the default value(1-100 or 101-200) in front of Circuits in use
Value of Origination Signalling Point Code: in the profile go to Emulator Config. ->MTP3
- Replace the default value in front of Signalling Point Code
- This value is used to fill the OPC field in ISUP message generated during Clarinet simulation
- This value is checked in the OPC/DPC fields of ISUP messages received by the Clarinet Generator and sent by the Clarinet Responder during simulation.
Value of Destination Point Code: In the profile go to Emulator Config. ->ISUP
- Replace the default value next to Destination Point Code (DPC)
- This value is used to fill the DPC field in ISUP message generated from Clarinet simulation
- This value is used to check the OPC/DPC fields in ISUP message received by Clarinet simulation and sent in messages defined in the Responder
Value of SLS: In the profile go to Emulator Config. ->MTP3
- Replace the default value under Signalling Link Code
- This value is used to fill the SLS field in ISUP message generated during Clarinet simulation

To launch the profile:

Select Profile->Run or click . It allows to select the name of profile. See Running a test
The windows of the Event-Editor is automatically opened.

To stop the profile

No messages displayed on the Event-Editor windows. Check if the Alarms line have an indication such as ' -+ FL' or '++FL' meaning that no signal is detected.
The protocol messages are displayed on the wrong directions: the E1 or T1 pair connected to the A and B port are the reverse side.