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Channel Associated Signaling Analyzer


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.

User's Guide
Product Brochure

GL's CAS Analyzer supports real-time monitoring and decoding of CAS signaling events over T1/E1 networks. Supported standards include MFCR2 and R1 protocols. The Real-time CAS Analyzer works with GL's T1 E1 analyzer hardware and corresponding software licenses (XX600, XX610, XX620, XX630).

Channel Associated Signaling (CAS) simulator is an optional application that works along with the GL's T1/E1 Analyzer Cards and Windows Client/Server software that simulates and analyzes any user-defined CAS protocols.

CAS emulation is also available with GL's Message Automation and Protocol Simulation (MAPS™). MAPS™ is a multi-protocol, multi-technology platform used for the emulation of a variety of communication protocols over IP, TDM, and Wireless networks. MAPS™ CAS can automate the testing procedure allowing the users to establish calls, and send/receive TDM traffic such as DTMF/MF digits, Tones, Voice, and Fax. In addition, GL supports various E1 MFCR2 analysis and simulationsolutions.

Main Features

  • Displays summary, detail, hex-dump, and statistics views.
  • Summary View displays captured timeslot, sub channel, frame#, device#, CAS signaling information like signaling bits, digits, type of digit, tone, frequency of tone, power of tone, on duration and off duration etc.
  • Detailed View displays decodes of a user-selected frames from the summary view.
  • Statistics View displays statistics based on frame count, byte count, frames/sec, bytes/sec etc for the entire captured data.
  • Hex dump View displays the frame information in HEX and ASCII format.
  • Streams may be captured on the selected time slots (contiguous or non-contiguous) and on full bandwidth.
  • Supports filtering and search based on digits, type of digits, signals etc.
  • Exports Summary View information to a comma delimited file for subsequent import into a database or spreadsheet.
  • Capability to export detailed decode information to an ASCII file.
  • Status bar displaying information regarding running percent utilization, number of frames captured, CRC errors and frame errors etc.
  • Any protocol field can be added to the summary view, filtering, and search features providing users more flexibility to monitor required protocol fields.

Supported Protocol

The supported protocol standards in CAS protocol analyzer is MFCR2 and R1.

  • CAS-R1

Summary, Detail and Hex dump View

The protocol analyzer opens with Summary, Detail and Hex Dump as default panes. Statistics and Call Detail are optional panes, which can be viewed if required.

  • The summary view displays port number, frame, length, event type, signal type, tones, digits, and more.
  • User can select a frame in summary View to analyze and decode in the detail view.
  • The Hex dump view displays the frame information in HEX and ASCII format. The contents of detail and hex dump view can also be copied to clipboard.

Real-time and Offline Analysis

Users can capture and analyze frames in real-time and record all or filtered traffic into a trace file. The recorded trace file can then be analyzed offline and exported to ASCII file, or printed.

The real-time analysis is used to capture data on one or multiple T1/E1 lines on the specified timeslots simultaneously during transmission. The captured data is always stored in a temporary file.

Filtering and Search

Users can record all or filtered traffic into a trace file. Filter and search capabilities adds a powerful dimension to the CAS analyzers. These features isolate required frames from all the captured frames in real-time.

Users can specify custom values for frame length to filter frames during real-time capture. The frames can also be filtered after completion of capture based on various protocol parameters such as CAS signaling type, digits, tones, or erred frames.
Similarly, search capability helps user to search for a particular frame based on specific search criteria.

Call Detail Record View

Important call specific parameters like Call ID details, the calling status whether the call is active or completed, calling number, called number, call start date and time, call duration, release cause, device number, and so on are calculated and displayed in Call Detail View. Additionally, users are provided with the option to search a particular call detail record from the captured traces.

Statistics View

Various statistics can be obtained to study the performance and trend in the CAS analyzer based on protocol fields and parameters

Save / Load All Configuration Settings

Protocol Configuration window provides a consolidated interface for all the important settings required in the analyzer. This includes various options such as protocol selection, startup options, stream/interface selection, filter/search criteria and so on. All the configuration settings can be saved to a file and then loaded for future operations, or user may just revert to the default values using the default option.

Buyer's Guide

Please Note1: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Item Description

T1/E1 Channel Associated Signaling (CAS) Analyzer
(includes xx600, xx610, xx620, and xx630; performs R1, MFC-R2, and other CAS Signaling Analysis)

  Related Software
XX651 MAPS™ CAS Protocol Emulator


CAS Simulator


w/ Transmit and Receive File Capability


w/ DTMF/MF/MFC-R2 + answer/place call capability


DSP Functionality


File Record/Playback Software

XX031 Enhanced T1 / E1 Call Capture/Analysis Software



DCOSS Software, R1 Protocol Included

MFC-R2 - Countries Available: Argentina, Bahrain, Brazil, China, Colombia, Czech Republic, India, Indonesia, Malaysia, Mexico, Singapore, Thailand, CCITT


Voice Recorder (FXO RJ11 Hardware Tap / 2-Wire Capture Software)

  Related Hardware


QuadXpress T1E1 Main Board (Quad Port– requires additional licenses) 


OctalXpress T1E1 Main Board plus Daughter Board (Octal Port– requires additional licenses)


tProbe™ Dual T1 E1 Laptop Analyzer Unit


Universal T1/E1 Card 


Portable USB based Dual T1 or E1 Laptop Analyzer Unit

XTE001 Dual Express (PCIe) T1 E1 Boards

* Specifications and features subject to change without notice.

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