Clarinet ISDN application


The Clarinet-system is a powerful Protocol Test Platform supporting ISDN interfaces and protocols. It offers a wide variety of functions:
  • Monitoring
  • Automatic simulation
  • Conformance testing for different layers of protocols based on ETSI or NIUF test suites

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Monitor Emulation Executable
Test Suites
Q921 x x ETS 300 402_7 x x
Q931-Basic Call x x ETS 300 403_5 x x
Supp Services x x x x see details
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

Interface Under Test

  • E1 75 or 120 Ohms
  • T1 75 or 100 Ohms
  • S-T Bus I431
  • U 2B1Q

Operating Interface

  • Transdata
  • Handset
  • Transit

Analysis Functions

Interface Management

  • Up to 7 simultaneous interfaces
  • 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) for D channel.
    • Data link: automatic B channel of BOP, BERT or BYTE-TS type.

Protocol Event Generation

  • Time-stamping at 0.1ms
  • Physical level: U and S-T states (infos I430), E1 and  T1 alarms.
  • Signaling link:  D channel HDLC frames.
  • Data link: HDLC frames, BERT-G821 results or BYTE-TS blocks.
  • DTMF code.

Statistics Event Generation

  • Sampling at a user specified value (in sec)
  • 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, T1, I430, G861
  • Signaling Link:
    • Data structure: BOP envelope, SS7.
    • Decoding according to a protocol stack with 7 decoding levels
  • Data Link:
    • Data structure: BOP envelope, SS7, BERT, BYTE-TS.
    • Decoding according to a protocol stack with 7 decoding levels
  • Event-Editor Functions for events, formatting, and filtering

Simulation Functions

Q931 Automatic Simulation:

Behavior: Generator (1 to 32 outgoing SETUP's) and/or responder (acceptance, 30 incoming SETUP’s).
  • Independent outgoing communications defined by:
    • delays and IE buffer for SETUP, INFOS, RELEASE.
    • number of repetitions and inter-communications delay.
    • B channel establish and active source.
  • Identical incoming communications defined by:
    • ACCEPT/REJECT behaviour.
    • Transmission option and IE buffer for SETUPACK, CALL-PROC, RELEASE.
    • Delay before CONNECT.
    • Establish and active source of the B channel: default or indication by USER INFO.
  • Manual commands: CALL, CLEAR, INFO, RESTART, etc..., DTMF values.
  • Outgoing communications triggered by:
    • Starting delay.
    • Manual commands.
    • Incoming communications (for 15 outgoing communications).
  • Call simulator data sources:
    • BOP Mode DL: X25 call simulator, user program.
    • DL Mode BERT: Pattern: 29 - 1 (V52), 211 - 1 (O152), 215 - 1 (O151), results according to CCITT G821.
    • DL Mode BYTE-TS.
    • LOOP.
    • External TRANSIT or TRANSDATA links.
    • COFIDEC 1 and 2 internal links on analog sources: DTMF 1 and 2,  HANDSET...

Emulation Functions

Physical Layer

  • Emulation mode: BRI / PRI, NT (Network) or TE (User).

Link Layer: Q921

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

Network layer: Q931

  • Selection of national variants (ETSI, NI2,ATT...)
  • Setting of Parameters (time-limits, numbering...)

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

IP automatic simulation:

  • IP/TCP/H323 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 signalling channel.

Conformance Testing Simulation


  • Use of ETS packages resulting from TTCN compilation:
    • ISDN Basic call and Supplementary services Network side
    • ISDN Basic call and Supplementary services User side
    • ISDN TBRs
  • 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-Book USB U/S-T




Clarinet-system: ISDN options



Product Designation



Clarinet-ETS-300 402_7 ISDN Data Link Layer



Clarinet-ETS-300 403_5 ISDN Basic Call User side



Clarinet-ETS-300 403_7 ISDN Basic Call Network side


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Last modification: 27/02/04