Clarinet X25 Features


The Clarinet-system is a powerful Protocol Test platform supporting X25 protocol  over ISDN, E1/T1 Trunks and  Vseries  interfaces. It offers a wide variety of functions:
  • Monitoring
  • Automatic simulation
  • Conformance testing for different layers of protocols based on ISO test suites.


Large snapshot


Monitor Emulation Executable
Test Suites
LAP-B x x ISO 8882-2 x x
X25-Packet x x ISO 8882-3 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
Signaling simulation
Programmable simulation
Conformance testing simulation

Interface Connection

Physical Interface

  • Data link of ISDN BRI and PRI interfaces (B channel)
  • Signaling link of ISDN BRI and PRI interfaces (D channel)
  • Data link of V24, V35, V36, X24.
  • Data link of E1 interfaces (1 to 31 aggregated TS)
  • Data link of T1 interfaces (1 to 24 aggregated TS)

Analysis Functions

Protocol Event Generation

  • X25 Data link:  BOP events,

Statistics Event Generation

  • BOP type event counters
  • Counters by PDUs type on LAP-B, X25
  • Data-flow counters by layer

Protocol Specification for Display

  • X25 Data  Link (protocol stack with 7 decoding levels):
    • BOP envelope,
    • X25 layers decoding:
      • Layer 2: ITU X25-LAPB
      • Layer 3: ITU X25;
    • Full decoding of X25 facilities
  • Event-Editor functions for events formatting and  filtering

Simulation Functions

Simulation Features

  • Establishment of communications:
    • Generator (1 to 50 outgoing PVC or SVC)
    • Responder (acceptance, 1 to 99 incoming CALL’s)
    • Up to 100 VC in the same time
  • X25 emulation parameters:
    • DTE/DCE emulation
    • Data-Link Layer LAP-B or LAP-D 

Automatic Simulation Behavior:

  • Generator configuration: from 1 to 50 independent outgoing calls defined by:
    • Delays and buffer for CALL, CLEAR.
    • Number of repetitions and delay between repetitions.
    • Data source and transmission mode.
  • Responder  configuration: identical incoming calls defined by:
    • ACCEPT/REJECT behavior.
    • Buffer for CALL CONNECTED.
    • Delay before CONNECT.
    • Transmission mode and data source: default or indication by user-data field.
  • All messages saved in a buffer defined by a user-friendly editor allowing to enter Mandatory Facilities, Addresses...
  • Manual commands for CALL, CLEAR packets.
  • Outgoing communications triggered by:
    • starting delay.
    • manual commands.

Data Sources for Virtual Circuits

  • Types:
    • Pattern (50 pre-defined), High-speed pattern.
    • Transmit File (20 pre-defined) - Receive File.
    • Loop.
  • Transmission mode of data source
    • Send continuously for n seconds.
    • Send x times and clear after n seconds.

Emulation Functions

LAP-B Layer: 

  • Setting of Parameters (time-limits, length)

LAP-D layer:

  • Setting of Parameters (numbering...)

X25 layer

  •  Time-out values
  •  Logical channels configuration: ranges of SVC, PVC.

Programmable Simulation


  • Use of CLARINET-Development C language
  • Microsoft format library.
  • Level N simulation using N-1 emulation on SS7 channel.

Conformance Testing Simulation


  • A set of Executable Test Suites packages resulting from compilation of standard ATS; developed by Acacia.
  • 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.

[Home]   [Products]  [Help Notes]  [Technical notes]  [Search]  [Site map]  [PDF Library]  [Contact]

Last modification: 27/02/04