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Press Release: GL Announces SS1 Protocol Analyzer

Gaithersburg, Maryland, USA - March 23, 2010 - GL Communications Inc., announced today the release of its newest SS1 Protocol Analyzer software for its T1 E1 hardware platforms. Addressing the press conference, Mr. Vijay Kulkarni CEO of the company said, "Selective Signaling 1 or "SS1" is a 2 and/or 3 digit dial system used by the Federal Aviation Administration. GL's SS1 Analyzer detects and analyzes tone sequences that make up SS1 dial digits. Sequences of pulse and guard tones are detected, decoded, and assembled into their corresponding dial digits. The tone sequences are also verified for compliance against a "specification" parameter file which can correspond to published standards or user criteria".

He added, "GL's T1 E1 Cards and USB based T1 E1 units provide dual T1 E1 ports and dual VF ports thru which SS1 protocol analysis is possible".

Mr. Kulkarni elaborated, "For Offline analysis, the SS1 analyzer allows users to specify the folder containing the files for SS1 analysis. File formats supported are a-law and u-law pcm files".

Important Features

  • T1 or VF real time monitoring and analysis

  • Offline (file based) analysis of prerecorded files

  • Ability to capture either TDM or audio signals

  • Configuration screens to conveniently specify the criteria used to evaluate the sequence of SS1 tones, including specifying the use of 2-digit or 3-digit dial codes.

  • Display of received dial codes, including the characteristics of the underlying tones. Dial codes whose underlying tone sequences do not meet stated criteria are clearly identified with the erroneous tone characteristics highlighted

  • Provides controls to save sets of evaluation criteria, to reinstate previously saved criteria, and to reinstate factory default (industry standard) settings

  • Save results to files in a form that is widely understood by popular desktop data management and analysis tools such as Microsoftģ Access and Microsoftģ Excel

  • Allows easy reviewing any number of selected dial code sequences and their underlying tone sequences while ongoing capture and analysis is proceeding

  • Operate the SS1 Analyzer either remotely from the data acquisition site, or as on the same PC that is capturing the data

For more information on the application, please refer to the SS1 Protocol Analyzer web page, or give us a call.

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.

GLís TDM Analysis & Emulation line of products includes T1, E1, T3, E3, OC-3, OC-12, STM-1, STM-4, 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, LTE, etc.), and with capacities up to thousands of channels. Our newest products provide astonishing capacity and capture capability up to and including gigabit speeds.

GLís VoIP and IP products generate / analyze thousands of calls and traffic simultaneously with traffic types such as frames, packets, voice files, digits, video, tones, noise, and fax. Almost all codecs are supported including G.711, G.729, AMR, EVRC-A,B,C, GSM, iSAC, and many more. Additional features include visual analysis, real-time listening, and recording. The product line also includes Ethernet / IP Testing capability that simulates and checks frame transport and throughput parameters of Ethernet and IP networks, including delay, errors and other impairments.

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 accepted solution for assessing voice quality in the telecom industry. Voice Quality Testing across multiple networks (T1, E1, T3, E3, OC-3, OC-12, VoIP, Wireless, and Landline) are all available.

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

GLís Echo Canceller testing solutions provide the broadest range of simulation and analysis, including line and acoustic echo. GLís compliance testing per G.168. G.167 and P.340 across TDM, IP, VoIP and Wireless networks is widely accepted in the industry.

GLís wireless 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.

GLís 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, RS-422, RS-530, X.21, T1, E1, T3, E3, and many others.

GLís 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 characteristics. 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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