Clarinet GSM application


The Clarinet-system is a powerful Protocol Test Platform supporting ISDN interfaces and protocols. It offers a wide variety of functions:
  • Monitoring

Large snapshot


Monitor Emulation Executable Test Suites C-Programs
A-Bis Q921 x x   x x
L3: RLM,
x     x  
x x   x x
BSSAP x     x  

The flexibility and the user-friendly interface of the software provides the user with a way to use it for product development, engineering or field trials.

Standard features

Interface connection
Analysis Functions
Emulation functions
Programmable simulation
Conformance testing simulation
Clarinet-system: basic configuration

Interface Connection

Physical Interface

  • E1 75 or 120 Ohms
  • T1 75 or 100 Ohms

Interface Management

  • Simultaneous management on each interface of three types of PH, SL, DL links:
    • PH-physical interface: U,  S-T, E1 or T1 selection.
    • Signaling link: definition of the signaling channel (T1 or E1).
    • Data link: automatic B channel of BOP, .

Interface Management

  • Management on each interface of two types of  links:
    • PH-physical link: E1 or T1 with configuration options.
    • SS7 Signaling link: definition of  2 SS7 signaling channels (A interface) or HDLC (A bis interface) for each T1 or E1 interface,

Analysis Functions

Protocol Event Generation

  • Physical level:, TS0-G703, T1 Alarms, clock slip
  • Signaling links:  BOP events,  SS7 events (frames counts)

Statistics Event Generation

  • BOP type event counters on SL or DL.
  • Data-flow counters on BOP link at different protocol layers.

Protocol Specification for Display

  • SS7 Signaling  Links (protocol stack with 7 decoding levels):
    • BOP envelope, frame counts (FISU)
    • A interface/SS7 layers decoding:
      • MTP2: ITU Q781
      • BSSAP
      • ISUP: ITU Q784
    • Abis interface
      • Q921 LAPD
      • BSSAP
      • Layer3: RLM, DCM, CCM, TRX, O&M
  • Event-Editor functions for events formatting and  filtering

Emulation Functions

Physical Layer

  • Emulation mode: Signaling Point.

MTP2 Layer: 

  • Setting of Parameters (time-limits, length)

MTP3 Layer:

  • Setting of Parameters (numbering...)

Link Layer: Q921

  • SAPI 0,16 and 63 initialization
  • Setting of Parameters (time-limits, numbering)

Programmable Simulation


  • Use of CLARINET-Development C language
  • Microsoft format library.
  • Level N simulation using emulation on signaling channel.

Clarinet-system: basic configuration



Product Designation



Clarinet-Book USB E1/T1





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Last modification: 27/02/04