Protocol Analysis

TDM, IP, 2G, 3G, 4G, & 5G Networks

Channel Associated Signaling Simulator (CAS Simulator)

Channel Associated Signaling 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 referred to as "in-band" signaling. Various types of CAS signaling types include Loopstart, Groundstart, Feature Group D (FGD), Winkstart, E1 MFCR2, and others.

GL's Channel Associated Signaling (CAS) simulator is a client-side application that works along with the GL's T1/E1 Analyzer Cards and Windows Client/Server software. It is an optional application that simulates and analyzes any user-defined CAS protocols by providing signaling bit transitions and forward/backward frequency digits and tones. In order to easily create the user-defined CAS scripts, the CAS simulator includes a script editor. Multiple user-defined protocols may be defined for each of the digital T1/E1 trunks associated with the GL analysis boards. In addition to generating/receiving CAS calls, the CAS simulator also processes the receipt of Dialed Number Identification Service (DNIS) and Automatic Number Identification (ANI) information.

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, Fax, and Voice.

In addition, GL supports various E1 MFCR2 analysis and simulation solutions. For more information, visit MFC-R2 Analysis and Emulation webpage.

Supported Protocols

  • E1 MFC-R2 (All variants, fully/semi compelled)
  • E1 European Digital CAS (EUC), Digital E & M, International Wink Start
  • E1 AP2 (Australian P2 protocol)
  • T1 Winkstart (R1 wink)
  • T1 Loopstart, Groundstart, Immediate Start, Feature Group D
  • Any User-Defined CAS Protocol

Main Features

  • Accesses the T1 (or E1) analyzer remotely
  • Supports called number and calling number identification
  • Customized signaling for each channel through scripts
  • Ready-to-use scripts for quick testing

Call Generation/Reception with Signaling Status

Call Generation/Reception with Signaling Status

In addition to receiving and placing calls, CAS Simulator also processes the receipt of Dialed Number Identification Service (DNIS) and automatic number identification (ANI) information, which is used to support authentication and other functions. The screenshots to the right display the manual call generation, and number identification functions performed by GL's CAS Simulator.

Script Editor

Script Editor

The GL CAS Simulator script is based on a self-describable language that can define the behavior of CAS Call Control procedure. Functions such as Place Call, Answer Call, Incoming Call, Disconnect call are all defined within the script. Additionally more advanced script may also be defined in the script. Definitions for Signaling Bit Transitions and forward/backward digits/tones are user definable within each script.

Capture Events

Capture Events

The events screen chronologically lists all of the CAS State Machine signaling bit transitions generated by each timeslot of each trunks. These transitions can be directed to an ASCII file is real-time or after they have appeared in the events list.

Flash Hook

Flash Hook

The application also provides a way for the users to send a Flash Hook signal in line manually. Users can vary Flash Hook On Signal (0-F), Flash Hook Off Signal (0-F) and Flash Hook Interval (ms) for a given timeslot.

MFC-R2 Analysis and Emulation

GL's MFCR2 Analysis & Emulation solutions use any of the following hardware:

  • T1E1 Analyzer (Potable USB or Ultra HD PCI cards or Universal Cards) Or
  • DCOSS (Digital Central Office Switch Simulator)

Both the products supports remote capture & analysis using client-server technology, while DCOSS is ideal for simulating and testing advanced telecom networks and products, including switches, gateways, and transmission systems.

Visit MFC-R2 Analysis and Emulation webpage for details.

MAPS™ CAS Emulator

MAPS™ CAS Emulator automates the testing procedure allowing the users to establish calls, and send/receive TDM traffic such as DTMF/MF digits, Tones, Fax, and Voice.

Supports testing of various protocols such as T1 Wink Start (R1 wink), T1 Loop Start and T1 Ground Start, T1 Feature Group D, T1 Immediate Start, E1 MFC-R2 (All variants, full /semi compelled), E1 European Digital CAS (EUC), E1 Digital E & M, E1 International Wink Start, and Any User-Defined CAS Protocol.

E1 MFC-R2 Signaling defined by the ITU Recommendations Q.421-Q.442, uses a multi-frequency compelled signaling protocol to exchange address information. MAPS™ CAS Emulator generates and sends MFC-R2 forward and backward tones per CCITT specifications. Currently, MAPS™ CAS includes ready profiles for India, China, and Mexico. Different country specific implementations will be supported in future.

Visit MAPS™ CAS Protocol Emulator webpage for details.

Call Generation


Please Note: 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
XX625 CAS Simulator
XX610 w/ Transmit and Receive File Capability
XX620 w/ DTMF/MF/MFC-R2 + answer/place call capability
XX630 DSP Functionality
  Related Software
XX651 MAPS™ CAS Protocol Emulator
XX031 Enhanced T1 / E1 Call Capture/Analysis Software
XX020 File Record/Playback Software
XX051 Synchronous Trunk Record Playback
PKV104 FaxScan™ for SIP and Fax over IP (T.38)
  Related Hardware
PTE001 tProbe™ Dual T1 E1 Laptop Analyzer with Basic Analyzer Software
HTE001 Universal T1/E1 Card with Basic Analyzer Software
UTE001 Portable USB based Dual T1 or E1 Laptop Analyzer with Basic Analyzer Software

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

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

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