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GLInsight™: An Expert System for Decoding and Analysis of Fax and Modem Communications
Over PSTN or IP Networks


Overview | GL's Tools for Fax and Modem Call Capture | Benefits | Features | Screenshots
Analyzing Fax Over IP | Analyzing Fax Over PSTN | Analyzing Modem Over PSTN and IP
Cross Analysis of Two Networks | Detailed GLInsight™ Capabilities | Buyer's Guide


Overview

GLInsight™ is a state-of-the-art system that provides promptly processed information and analysis of data collected on IP and PSTN networks. Decoded results are analyzed on a per-network basis. Alternatively, data from two networks can be combined to provide additional insight into the networks’ behavior.

GLInsight™ has a Windows®-based user-friendly GUI which supplies the developer with varied and valuable information. Results files and transmitted graphics, signal level, and signal quality are just a few of the diagnostic tools provided.

 
pdf User's Guide
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GL Insight™ enables decoding and analysis of pre-recorded modem and fax transmissions. The transmission signals can be recorded from PSTN or IP media. It is a unique system used by developers of modem and fax technology often in interoperability labs. GL Insight™ can be used during the development and deployment phases of the products that support fax and modem transmission.

GL Insight™ receives the recorded modem or fax transmissions in one of the two ways:

  • As raw signal files (PCM files) - in either mono or stereo format
  • As IP capture files - created by capturing devices or by software.

GLInsight™ demodulates the raw transmissions and presents the decoded data in an easy to understand format. It produces extensive log files with all relevant debugging information for easy event tracing which in turn provides insight to potential sources of problems.


GL's tools for Fax and Modem Call Capture

Over PSTN - The raw files required for fax and modem analysis in the case of PSTN (2-wire or TDM) can be obtained using following hardware platforms:

  • GL's T1/E1 Analyzer with Call Capture Analysis (CCA) - The capability of CCA software to non-intrusively record calls directly from T1/E1 lines offers a solution to capture Voice/ Fax / Modem traffic from the 2-wire Analog interface. However, this capture solution requires the purchase of T1 / E1 Analyzer.

  • GL's 2-Wire Voice Recorder with Dual UTA - The Voice Recorder Software is primarily used in conjunction with Dual Universal Telephony Adapter (Dual UTA) hardware device to capture the voice/modem/fax data manually / automatically from the 2-wire Analog interface.

The recorded PCM voice/data files can be analyzed using GL Insight™ Modem and Fax Analysis Software for 2-wire Analog interface and Adobe Audition (third-party application) for voice files analysis.

Over IP - Similarly, for fax and modem analysis over IP, the captured files can be obtained using GL's PacketScan™ - VoIP analyzer.

  • GL's PacketScan™ PacketScan™ software supports capturing and decoding of Fax (T.38 data) calls over VoIP. PacketScan™ fax decodes can be viewed in the form of T.38 call graph and call summary with decoded information for all T.38 messages received on the call. The captured fax calls by PacketScan™ can also be analyzed using GLInsight™ by saving the fax calls directly in (*.PCAP) Ethereal file format

Who Benefits from GLInsight™?

Equipment Developers (Gateways, RAS, Fax Servers, etc.)

  • Provides bottom-up deep diagnosis of the call
    e.g. (fax): provide info from data pump layer up to tiff picture
  • Helps solve interoperability issues
  • Diagnoses physical layer problems
  • Diagnoses network layer problems

Service Providers (Mobile Operators, ISPs, WISPs, Carriers & Operators)

  • Non-intrusive IP network diagnosis
    • High packet loss rate
    • High jitter
  • Non-intrusive TDM network diagnosis
    • Echo path
    • Echo canceller performance
  • Indicates possible location of problems

Main Features

  • Enables demodulation and analysis of Data (Modem), Fax, Mobile Fax, Mobile Data, and VoIP transmissions over TDM and IP networks
  • Offline analysis of TDM & IP captured files
  • Supports Windows® XP, and Windows®7 (32 and 64 bit) operating systems
  • Mixed Fax-over-IP using T.38/G.711 and Fax-over-PSTN Cross Analysis
  • Mixed Modem over IP (Using G.711) and Modem over PSTN Cross Analysis
  • Time synchronization performed on PSTN and IP signals
  • Cross analysis of two networks
  • Provides bottom-up deep diagnosis of calls to solve interoperability issues
  • Diagnoses physical and network layer problems
  • Non-intrusive IP/TDM network diagnosis of high packet loss rate, high jitter, echo path, and echo canceller performance, to indicate possible locations of problems

GLInsight™ Screenshots


Analyzing T.38 Communications (Fax over IP)


Analyzers:

IP Stream
  • Packet loss and jitter analysis
  • Illegal packets
T.30 Decoder
  • T.4/T.6 compression information and incompatibility
  • Improper state flow analysis
  • ECM problems

Click here for more detailed information about Fax over IP using T.38...


Analyzing Fax Communications over PSTN and IP (using G.711)



Analyzers:

IP Stream
  • Packet loss and jitter analysis
  • Improper use of Voice Activity Detector
Data Pump State Machine
  • Demodulation quality
  • Detailed phase info exchange


Signal
  • Signal quality
  • Discriminator information
T.30 Decoder
  • T.4/T.6 compression information and incompatibility
  • Improper state flow analysis
  • ECM problems

Click here for more detailed information about Fax over IP...

Click here for more detailed information about Fax over PSTN...

Screen Shot of Fax Data Analysis Over PSTN


Analyzing Modem Communications over PSTN and IP (using G.711)

Analyzers:

IP Stream
  • Packet loss and jitter analysis
  • Improper use of Voice Activity Detector
Data Pump State Machine
  • Demodulation
  • Detailed phase info exchange
  • Improper state flow and timeouts

Signal
  • Input signal stability overflow
  • Discriminator information
Error Correction Data Compression
  • Negotiation exchange information
  • Improper state flow analysis

Click here for more detailed information about Modem over IP...

Click here for more detailed information about Modem over PSTN...

Screen Shot of Modem Data Analysis Over PSTN


Cross-Analysis of Two Networks

When there is information about a call from both the PSTN and IP networks, GLInsight™ can plot both results on a single time scale to facilitate easier analysis of the problems and their causes.


Click here for more detailed information about Cross Analysis...


Detailed GLInsight™ Capabilities

Fax-Over-IP using T.38 Decoding and Analysis
  • Fax phase changes, data rates
  • Structures interchange (rate sequences, MP, Info) and complete connection parameters
  • T.30 raw data
  • T.30 frames and information
  • T.4/T.6 page coding information
  • Packet loss
  • Jitter behavior
  • Improper T.30 protocol indication
  • CRC error detector in V.21
  • Repetitive T.30 frames detector
  • T.4/T.6 bad-line statistics
  • No-signal on single-sided indication
  • Suspicious ECM retransmission indication
  • ECM failure to correct error frames indication
  • Unexpected end of Fax indication
  • Bad packets indication
  • Packet collision detection


Fax-over-IP (using G.711) Decoding and Analysis
  IP Analysis Information
  • Packet loss
  • Jitter histogram
  • SID (Silence Descriptor) detector to detect improper use of Voice Activity Detector while transferring data
  Fax Analysis Information
Supported Protocols
  • V.34HD, V.17, V.33, V.29, V.27, V.21, T.30, T4/T6
Fax Decoding Categories & Sub-categories
  • Signal Analyzers
    • Discriminator information
    • Unstable signal detector
    • Signal overflow detector
    • No-signal on single-sided indication
  • Data Pump State Machine Analyzers
    • Fax phase changes, data rates, symbol rate
    • Structures interchange (rate sequences, MP, Info) and complete connection parameters
    • PDSNR (post detection signal quality measurement) improper quality drop detector
    • V.8 incompatibility indication
  • T.30 Decoder Analyzers
    • T.30 raw data
    • T.30 frames and information
    • T.4/T.6 page coding information
    • CRC error detector in V.21
    • Repetitive T.30 frames detector
    • T.4/T.6 bad-line statistics
    • Suspicious ECM retransmission indication
    • ECM failure to correct error frames indication
    • Unexpected end of Fax indication
    • Improper T.30 protocol flow indication


Fax-over-PSTN Decoding and Analysis
Supported Protocols
  • V.34HD, V.17, V.33, V.29, V.27, V.21, T.30, T4/T6
Fax Decoding Categories & Sub-categories
  • Signal Analyzers
    • Discriminator information
    • Unstable signal detector
    • Signal overflow detector
    • No-signal on single-sided indication
  • Data Pump State Machine Analyzers
    • Fax phase changes, data rates, symbol rate
    • Structures interchange (rate sequences, MP, Info) and complete connection parameters
    • PDSNR (post detection signal quality measurement) improper quality drop detector
    • V.8 incompatibility indication
  • T.30 Decoder Analyzers
    • T.30 raw data
    • T.30 frames and information
    • T.4/T.6 page coding information
    • CRC error detector in V.21
    • Repetitive T.30 frames detector
    • T.4/T.6 bad-line statistics
    • Suspicious ECM retransmission indication
    • ECM failure to correct error frames indication
    • Unexpected end of Fax indication
    • Improper T.30 protocol flow indication


Modem over IP Decoding and Analysis
 Supported Protocols
  • V.92 (Quick Connect and Modem-on-Hold supported. PCM-upstream not supported)
  • V.90
  • V.34
  • V.32bis/V.32
  • V.22bis/V.22
  • V.21
  • V.23
  • Bell 103 / Bell 212
 Supported Start-up Protocols
  • V.8
  • V.8bis
  • V.8 short
 Supported Error Correction & Data Compression Protocols
  • V.42
  • V.42bis
  • V.44
  • MNP2-4
  • MNP5
  • V.14
 Modem Decoding-and-Analysis Information

 Categories & Sub-categories
  • Signal Analyzers
    • Discriminator information
    • Improper Automode signal flow detector
    • Improper V.8 signal flow detector
    • Unstable Signal level detector
    • Signal overflow detector
  • Data Pump State Machine Analyzers
    • Modem phase changes, retrains, rate renegotiations, data rates, symbol rates
    • Internal phase states such as S detections and all the phase 2 sub-states
    • Structures interchange (MP, CP, Info) and complete connection parameters
    • Data-pump improper flow detector such as inconsistency of the signal with the standard
    • PDSNR (post detection signal quality monitoring) improper quality drop detector
    • Improper phase reversal detector
  • Error Correction Data Compression Analyzers
    • Error-correction and data compression setup information including XID info
    • Error-correction frame statistics
    • Data compression negotiation
    • Error-Correction improper flow detector


Modem over PSTN Decoding and Analysis
  Modem Analysis Information
  • Supported Protocols
    • V.92 (Quick Connect and Modem-on-Hold supported. PCM-upstream not supported)
    • V.90
    • V.34
    • V.32bis/V.32
    • V.22bis/V.22
    • V.21
    • V.23
    • Bell 103 / Bell 212
  • Supported Start-up Protocols
    • V.8
    • V.8bis
    • V.8 short
  • Supported Error Correction & Data Compression Protocols
    • V.42
    • V.42bis
    • V.44
    • MNP2-4
    • MNP5
    • V.14
Modem Decoding-and-Analysis Information

 Categories & Sub-categories
  • Signal Analyzers
    • Discriminator information
    • Improper Automode signal flow detector
    • Improper V.8 signal flow detector
    • Unstable Signal level detector
    • Signal overflow detector
  • Data Pump State Machine Analyzers
    • Modem phase changes, retrains, rate renegotiations, data rates, symbol rates
    • Internal phase states such as S detections and all the phase 2 sub-states
    • Structures interchange (MP, CP, Info) and complete connection parameters
    • Data-pump improper flow detector such as inconsistency of the signal with the standard
    • PDSNR (post detection signal quality monitoring) improper quality drop detector
    • Improper phase reversal detector
  • Error Correction Data Compression Analyzers
    • Error-correction and data compression setup information including XID info
    • Error-correction frame statistics
    • Data compression negotiation
    • Error-Correction improper flow detector


Cross Analysis Decoding Schemes
  Identically Coded and Analyzed Info Categories
  • Mixed Fax-over-IP (Using T.38) and Fax-over-PSTN Cross Analysis
  • Mixed Fax over IP (Using G.711 Pass-Through) and Fax over PSTN Cross Analysis
  • Mixed Modem over IP (Using G.711) and Modem over PSTN Cross Analysis
  Uniform Decoding & Analysis Schemes
  • A time synchronization process is performed on PSTN and IP signals
  • All information indicators from IP and PSTN sides are mixed on a single time scale to determine where on the timeline (IP or PSTN) problems started to occur.

Buyer's Guide:

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
FXT001
FXT002
GL Insight - Single Fax Analysis - TDM
GL Insight - Single Fax Analysis - IP
MDT001
MDT002
GL Insight - Single Modem Analysis - TDM
GL Insight - Single Modem Analysis - IP
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HDT001/HDE001 Legacy HD T1 or E1 (PCI) Cards with Basic Analyzer Software
UTE001 Portable USB based Dual T1 or E1 Laptop Analyzer with Basic Analyzer Software
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DR001 DCOSS Software
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VQT035 FXO 2-Wire Voice/Data Capture Software
PKS100 PacketGen™ (includes PacketScan™)
PKV100 PacketScan™ (Online and Offline)
SA026 Adobe Audition Software
SA048 Goldwave Software

* Specifications are subject to change without notice.



 
 
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