ISDN Simulator with 4 Basic Rate S/T ports

Product overview

The B-Link4 is our compact ISDN basic rate network simulator with four ports. It performs complete call handling procedures for accurate simulation, without the need for a Switch or PBX (Central Office). B-Link4 may be used with routers, video conferencing terminals, terminal adapters, PC applications or any ISDN basic rate terminal fitted with a standard S/T interface!

Because B-Link4 has 4 independent network ports, is can be used to enable the cross connection of 4 ISDN terminals using all 8 (64k) B channels simultaneously.


B-Link4 allows you to make 64K or full bandwidth 128K data (or speech) calls in your CCIE lab, at an exhibition or on the work bench. It's even possible to make calls from one terminal in isolation, using the auto-answer mode. Status LED's are provided to indicate activity at all protocol layers including any bearer (B) channels used. Each B-Link4 is supplied with a simple delivered configuration with easy to remember telephone numbers for each port, allowing you to gain full control of your application within minutes.

B-Link4 ISDN Simulator

Product features...

  • US & Euro ISDN protocol support.
  • Four independent network ports.
  • True plug and play simplicity.
  • Windows software for modifying protocol support, telephone numbers and much more!
  • Provides reliable ISDN anywhere for complete end-to-end calls to show equipment at it's best.
  • Use for demonstration, training, CCIE lab or production test of any ISDN basic rate terminal with a standard S/T interface.

Flexible Configuration Options

A Windows software program is provided with the B-Link4 so that the user may specify telephone numbers, protocol support, SPID's and much more. Any required changes can be saved as the new default.

Protocol Decode

The B-Link4 software program also provides access to the powerful protocol trace feature, ideal for those wishing to learn more about the ISDN protocol or for fault finding.


The B-Link4 is very compact and can be used for a wide range of applications which makes it the ideal choice when temporary ISDN lines are required.

Need more ISDN ports?

Find out more about our Simline 6 which has 6 basic rate ISDN ports and 1 optional primary rate port.

Features and Specifications

Number of Ports 4 basic rate ISDN ports, 1 RJ45 per port.
Interface type ISDN S/T
Protocol Support ETSI Euro-ISDN
Supports SPIDs (subset of National ISDN 1/2)
Supplementary Services Called/Calling Line ID Presentation.
High/Low Layer Compatibility.
Multiple Subscriber Number.
Numbering Options Single Number.
Dual Number.
Multiple Subscriber Number (last digit).
LED Indicators B1 Channel Active.
B2 Channel Active.
PH (synchronised with network clock).
DL (Datalink layer).
PS1 (indicates power on BRI ports).
Special Features Generation of any required clearing causes to test terminal responses.
Connect and test calls with just one terminal connected using Loopback Mode.
Configure specific timer values to bring down Layer 1 and Layer 2 for simulation of different Euro-ISDN network behaviour.
Operating Environment Windows 95/98/NT4/2000/XP.
Note: PC required only for setup of required configuration.
Configuration Interface Serial Port - 9 way D type.
Size/Weight 15.3cm [6in] x 10.3cm [4.25] x 4cm [1.75] / 300g.
Power Compact power adapter: please state required model - UK, European, US, Australian.
Warranty One year.

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