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Press Releases: GL Releases Scripted & GUI
ISDN Emulator

Gaithersburg, Maryland, USA - March 17, 2009 - GL Communications Inc., announced today the release of Scripted and GUI ISDN Emulator. Speaking to the press, Mr. Rob Bichefsky, Project Manager at GL said, "GL's ISDN Emulator for T1 E1 networks has been available as a manual GUI based ISDN Emulator and now is available as a Scripted (client-server) based application. ISDN emulation features include selection of various ISDN standards, variants & NFAS, including the flexibility to modify ISDN call parameters & message content. This flexibility ensures that the ISDN emulator will communicate with a wide variety of systems under test. It's even possible to emulate a complete ISDN connection (switch to subscriber) all in the same PC with a dual interface T1 E1 card".

He added, "The scripted (client-server) based ISDN Emulator emulates ISDN calls over T1 E1 links in a similar manner as the GUI, with the added capability to script entire ISDN sessions. The script can be run and rerun for automated environments. Additionally, the ISDN Emulator application offers the following advantages:

  • Simultaneous testing of high capacity T1 E1 systems through a single client
  • Remotely control ISDN emulation using simple commands by client applications
  • Collection of call records from remote locations

Mr. Bichefsky further added, "The GUI ISDN Emulator provides a user-friendly graphical interface, which allows the user to get up and running quickly. From 1 to 4 T1 or E1 trunks can be supported with a mixture of subscriber or switch emulation on different trunks. The Emulator provides ease of configuring various parameters like call management and nearly all protocol variants are supported and easily selected. Link status (Lap D) is also indicated".

Some of the important features

  • Nearly all ISDN standards and variants are supported. Variants are AT & T #4ESS, AT & T #5ESS, Bellcore #5ESS, National ISDN 2, Nortel, DMS - 250, and Siemens EWSD
  • 1 to 4 Configurable Signaling Links.
  • Supported protocol layers - LAPD and Q.931 Layers
  • Switch and Subscriber Emulation
  • User Friendly GUI for Configuring the ISDN Layer parameters. Includes configuring for Called/Calling Numbering Plan/Type, type of ISDN service, etc. These ISDN parameters may be saved within a Timeslot group so as to allow multiple ISDN parameter configurations, simultaneously.

For comprehensive information on the product, please refer to ISDN Emulator web page.

About GL Communications Inc

Founded in 1986, GL Communications Inc. is a leading supplier of test, monitoring, and analysis equipment for TDM, Wireless, IP and VoIP networks. Unlike conventional test equipment, GL's test platforms provide visualization, capture, storage, and convenient features like portability, remotability, and scripting.

GL's TDM Analysis & Emulation line of products includes T1, E1, T3, E3, OC-3, STM-1, analog four-wire, and analog two-wire interface cards, external portable pods, and complete system solutions. Capabilities include voiceband traffic analysis and emulation across all traffic types (voice, digits, tones, fax, modem), all protocols (ISDN, SS7, GR-303, Frame Relay, HDLC, V5.X, ATM, GSM, GPRS, etc.), and with capacities up to thousands of channels.

GL's VoIP products generate / analyze thousands of calls simultaneously with traffic types such as voice files, digits, video, tones, noise, and fax using G.711, G.729, AMR, EVRC, GSM and a range of other codecs. Additional features include visual analysis, real-time listening, and recording. The product line also includes a Software Ethernet Testing capability that checks frame transport and throughput parameters of Ethernet and IP networks.

GL's Voice Quality Testing (VQT) product line complements all of GL's products. Using ITU-standard algorithms (PAMS, PSQM, and PESQ), GL's VQT provides a widely excepted solution across the telecom industry. Voice Quality Testing across multiple networks (T1/E1/T3/E3/OC-3, VoIP, Wireless, Landline, etc.) are all available.

GL's Wireless Products perform protocol analysis and voice quality assessment on GSM, CDMA and UMTS networks. Connections can be made to any wireless phone with automated call control, GPS mapping and real-time signal measurements.

GL's Echo Canceller testing solutions provide the broadest range of simulation and analysis, including compliance testing per G.168 and G.160 across TDM, IP, VoIP and Wireless networks. GL's wirelss VQT solutions help assessing impairments to voice quality such as poor mobile phone quality, voice compression and decompression algorithms, delay, loss and gain in speech levels, noise, acoustic and landline echo, and other distortions are easily assessed and accurately measured.

GL's Handheld data testers can test a wide variety of communications facilities and equipment including T1, fractional T1, E1, fractional E1, T3 and E3 modems, multiplexers, CSU/DSUs, T1 CSUs, DTUs, NTUs and TIUs and more. The testers provide convenience, economy, and portability for almost any interface, including RS232, RS422 / RS530, X.21, T1, E1, T3, E3, and many others.

GL's Network Surveillance and Monitoring products include Probes for TDM, IP, VoIP, ATM, and Wireless networks. An open standards based approach provides a scalable, feature rich, real-time access to network intelligence. Centralized or distributed access, efficient transport and database loading allow compatibility with 3rd party and standards based monitoring systems.

For more information about GL's complete line of products,


Shelley Sharma
Phone: 301-670-4784 ext. 114

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