Clarinet Trunk application


The Clarinet-system is a powerful Protocol Test platform supporting E1/T1 interfaces and protocols. It offers a wide variety of functions:
  • Monitoring
  • Automatic simulation
  • Conformance testing for data protocols (X25, Frame Relay) 

Large snapshot

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
Signaling simulation
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: E1 T1 selection.
    • Signaling Link: definition of a 64kb/s BOP channel.
    • Data link: Definition of a Nx64 kbits/s (from 1 to 31 aggregated TS) allowing transfer rate up to 1984 kbits/s with BOP, BERT data structure.

Analysis Functions

Protocol event generation

  • Physical Level: G703 and T1 alarms, CAS (abcdbits) .
  • Signaling Link: HDLC frames, SS7-MTP2 messages.
  • Data Link: HDLC frames, BERT-G821 results or BYTE-TS blocks.
  • DTMF tone code.

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

  • Physical Link: E1 TS0, CAS abcd bits.
  • Signaling Link:
    • Data structure: BOP envelope, SS7.
    • Decoding according to a protocol stack with 7 decoding levels
  • Data Link (protocol stack with 7 decoding levels):
    • Envelope BOP, .
    • Data structure: BOP envelope, SS7, BERT, BYTE-TS.
    • Decoding according to a protocol stack with 7 decoding levels

Simulation function

  • On Data Link: 
    • BOP mode:
      • X25 automatic simulator,
      • Frame Relay automatic simulator
    • BERT Mode :
      • Pattern: 29 - 1 (V52), 211 - 1 (O152), 215 - 1 (O151),
      •  Results according to CCITT G821.
    • BYTE-TS mode:
      • Events file transmission
  • On any TS:
    • LOOP.
    • TRANSIT or TRANSDATA links.
    • COFIDEC 1 and 2 internal links on analog sources: DTMF 1 and 2,  HANDSET...

Emulation Functions

Physical Layer

  • Emulation mode: Network or User.

Data Simulation

X25 Automatic Simulation:

  •  X25 automatic simulator can be run in:
    • D channel
    • B channel

Frame Relay Automatic Simulation:

  • Frame Relay automatic simulator can be run in B channel

Programmable Simulation


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

Conformance Testing Simulation


  • Use of ETS packages resulting from TTCN compilation:
    • X25 ISO ETS
    • FR SVC and PVC
  • Template of profiles, PICS/PIXIT
  • Execution under Clarinet Run-time


  • The Clarinet  TTCN compiler and the stack of emulators allow the users to develop or customize new ETS.

Clarinet-System: Basic Configuration



Product Designation



Clarinet-Book USB E1/T1




Clarinet-System: Trunk Options



Product Designation


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Last modification: 27/02/04