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Press Release: GL Announces the Release of Channel Associated Signaling (CAS) Simulator

Gaithersburg, Maryland, USA - October 17'th, 2006 - GL Communications Inc., today announced the release of a new product, called Channel Associated Signaling (CAS) Simulator. Channel Associated Signaling (CAS) is a method of signaling in telephone networks where each channel or timeslot carrying speech also carries with it the signaling and addressing to set up and tear down that same channel. This is commonly referred to as "in-band" signaling as opposed to "out-of-band" signaling, such as ISDN or SS7. Signaling bits associated with each voice channel carry "on-hook" and "off-hook" status and addressing information in the form of dual tone digits to direct the call to its destination.

Addressing the press conference, Mr. Vijay Kulkarni, CEO of GL said, "CAS protocols are still prevalent in the TDM telephone network and a flexible way of simulating the myriad variations would be very useful indeed. He added, "The beauty of GL's CAS Simulator is that virtually any CAS based protocol can be simulated precisely and efficiently, irrespective of its complexity, for both T1 and E1 worlds. In the T1 world, CAS protocols are implemented thru "robbed bit signaling", a unique way of signaling that has always caused confusion among engineers. In the E1 world, CAS protocols are implemented thru time-shared use of timeslot 16. In both systems, dual tones representing digits are used for called and calling numbers".

GL's CAS Simulator supports the following protocols:

  • E1 MFC-R2 (All variants, full /semi compelled)
  • T1 Winkstart (R1 wink)
  • T1 Loopstart and T1 Groundstart
  • E1 European Digital CAS (EUC)
  • Any User-Defined CAS Protocol

A brief summary of the important features of the CAS Simulator are:

  • Customized signaling for each channel through scripts

    The GL's CAS Simulator provides a script editor. It is based on a self-describable language that can define the behavior of CAS Call Control procedure.

  • Call Generation/Reception with Signaling Status

    GL's CAS Simulator processes the receipt of Dialed Number Identification Service (DNIS) and Automatic Number Identification (ANI) information.

  • Capture Events

    GL's CAS Simulator events screen chronologically lists all of the CAS State Machine signaling bit transitions, digit detections, and tone detections, generated by each timeslot of each trunk.

  • Flash Hook

    CAS Simulator provides a way for users to send a Flash Hook signal manually.

For complete information about GL's CAS simulator product, please visit: CAS Simulator page

About GL Communications Inc

Founded in 1986, GL Communications Inc. is a leading supplier of test, monitoring, and analysis equipment for TDM, Wireless, 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, OC-3, STM-1, analog four-wire, and analog two-wire interface cards and solutions. Capabilities include voiceband traffic analysis and emulation across all traffic types (voice, digits, tones, fax, modem), all protocols (HDLC, ISDN, SS7, CAS, GSM, GPRS, CDMA), 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, tones, noise, and fax using G.711, G.729, AMR, EVRC, and GSM codecs. Additional features include visual analysis, real-time listening, recording, and voice quality assessment using ITU algorithms PAMS, PSQM, and PESQ.

GL's Wireless Products perform protocol analysis and voice quality assessment on GSM, CDMA, UMTS, and CDMA 2000 networks. Connections can be made to any wireless phone with automated call control, GPS, mapping software, 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.

GL's Network Surveillance and Monitoring products include Probes for TDM, 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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