How to simulate one basic call over PRI E1/T1 from the Network side

Simulation of an ISDN terminal  is one of the features directly covered by the templates included in the Clarinet Run-Time.

Connecting the unit

The Clarinet Book USB E1/T1 which simulates the Network side in front of a User, uses the a port "From User". 

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

Creating the profile for PRI-Network simulation

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

• Profile->New->ISDN......See: building
  • ETSI
  • ATT
• Profile with a description including ISDN, Simu, Network, PH=E1 or  T1, SL=Q931
  • ETSI
  • ATT
• Filter with a description including  SL= Q931, DL=BOP

Example using the wizard:

• ProfileèNewèISDNèETSIèisdn_etsi_simu_net_e1.acpèFilter?èisdn_etsi_bop.acf
• ProfileèNewèISDNèATT-5ESSèisdn_att_simu_net_t1.acpèFilter?èatt_etsi_bop.acf

Profile resulting from the wizard is ready for monitoring in the D channel with Q931 decoding

• Modifications to apply to the profile about physical interface:
  • E1 Options: CRC4 multi-frame if CRC4 is used on the interface.
  • T1 Options: ESF/SF multiframing,.....

• Modifications to apply to the profile about Q931signalling:

  • Changing the dialed number: Generator è Comm1 èEdit è Called Party NumberèCoding

Saving the profile:

• ProfileèSave asèfilename.acp.

Running the profile

To launch the profile:

• Select Profile->Run or click over . 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

• Click over   See: Stopping a test
• The window of the Event-Editor is automatically close

Troubleshooting over PRI

• 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.
• Events "CLOCK SLIP" are displayed by the Event-Editor periodically: the User side does not synchronize from the Clarinet interface.  

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updated:  27-Feb-04