ISDN Simulator with 2 Basic Rate Ports (S/T & U Interfaces)

Product overview

B-LinkU is our best selling low cost ISDN simulator. This compact unit allows you to simulate the basic rate ISDN network between any terminal fitted with an S/T or U interface, such as routers, TA's and video conferencing units. Both ports are completely independent allowing you to connect 2 terminals with the same interface type or one U interface terminal and one S/T interface terminal.


B-LinkU 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. B-LinkU performs complete call handling procedures for accurate simulation, without the need for a Switch or PBX (Central Office).

ISDN Simulator 2 ports S & U interfaces

Product features...

  • US & Euro ISDN protocol support.
  • Perfect for CCIE lab, demonstration, training, development & production testing.
  • True plug and play simplicity.
  • Windows software for modifying protocol support, telephone numbers and much more.
  • Comprehensive online help and user guide.
  • Offers the best quality and repeatability at an affordable price.
  • Telephone numbers up to 30 digits in length may be programmed for each channel.
  • Includes excellent protocol analysis feature.

Ease of Configuration

Each unit is supplied with a simple delivered configuration for plug & play simplicity. A Windows software program is provided with the B-LinkU 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-LinkU 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.


B-LinkU is compact, reliable and feature rich. When S/T or U interfaces are required at a budget friendly price, the B-LinkU is the ideal choice.

Need more ISDN ports? Find out about our B-Link4 - which has 4 basic rate ISDN ports (S/T interface) or our Simline 6 which has 6 basic rate ports (S/T interface) and 1 primary rate port (E1 interface).

Features and Specifications

Number of Ports 2 active ports using either U or S/T interface.
Interface type 2 wire U interface, 1 x RJ45 socket per port.
4 wire S/T interface. 1 x RJ45 socket per port.
Protocol Support ETSI Euro-ISDN
Supports SPIDs (subset of National ISDN 1/2)
Supplementary Services Called/Calling Line ID Presentation.
Called/Calling Party Subaddressing.
High/Low Layer Compatibility.
Multiple Subscriber Number (last digit).
Numbering Options Single Number.
Dual Number.
Multiple Subscriber Number (last digit).
LED Indicators B1 Channel Active.
B2 Channel Active.
SYN/PH (synchronised with network clock).
DL (Datalink layer).
PS1 Present - S/T 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[4.25in] x 4cm[1.75in], 330g [11oz]
Power Compact power adapter: please state required model - UK, European, US, Australian.
Warranty One year.

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