GL Communications Inc.
Home  >  Analysis  >  Software Applications  >  Protocol Analysis

Real-time GPRS Protocol Analyzer


GPRS (General Packet Radio Service) permits continuous data connectivity over wireless GSM networks. For example, mobile phones and laptops can be used to send and receive data over the Internet, e.g. e-mail and WEB surfing are typical examples. GL's GPRS Analyzer performs real time (and offline) analysis across the Gb (T1/E1) interface. The companion GSM Analyzer can also monitor the Abis and A interfaces, simultaneously.

The GPRS Analyzer when connected between SGSN and BSS elements of a GPRS network, permits the monitoring of Gb interface.

User's Guide
Product Brochure
Sample Messages
View Presentation

GL Communications supports the following types of GPRS analyzers:

  • Real-time GPRS Analyzer (Pre-requisites: GL's field proven E1 or T1 internal cards or USB Laptop E1 or T1 external units, required licenses and Windows® 7/8.1 Operating System)
  • Offline GPRS Analyzers (Pre-requisites: Hardware Dongle, and Windows® 7/8.1 Operating System)

Main Features

  • Supports filtering and search features based on Gb Interface parameters such as Data Link, Network Service, BssGp, LLC, Gprs Mobility/Session Mgmt, SMS, TOM and SNDCP
  • Displays Summary, Detail, Hex-dump, Statistics, and Call Trace Views, the contents of this view can also be copied to clipboard.
  • Summary view displays GB Interface information such as DLCI, FECN, BECN, SAPI, CTL, Session Mgmt Message etc.
  • Detail View
    • Displays decodes of user selected frame from the Summary View.
    • Provides options to display or hide the required protocol layers
    • Contents of this view can also be copied to clipboard.
    • Provides option to toggle detail view vertically or horizontally as feasible for the user.
  • Hex dump view displays raw frame data as hexadecimal and ASCII octet dump, the contents of this view can also be copied to clipboard.
  • Option to combine data from multiple columns under one column.
  • Statistics View displays statistics based on frame count, byte count, frames/sec, bytes/sec etc for the entire captured data. It also displays Total Frames, Average Frames and Utilization, Maximum Frames and Utilization, and so on.
  • Call Detail View displays called/ calling number, released calls, call status, & more.
  • Capability to export Summary View to a comma separated values (CSV) format for subsequent import into a database or spreadsheet.
  • Capability to export detail decodes information to an ASCII file.
  • Any protocol field can be added to the summary view, filtering, and search features providing users more flexibility to monitor required protocol fields.
  • Remote monitoring capability using GL's Network Surveillance System.

Additional features supported by real-time GPRS analyzer are:

  • Multiple streams of GPRS traffic on various T1/E1 channels can be simultaneously decoded with different GUI instances .

    For Gb Interface,

  • Streams can be captured on the selected time slots (contiguous or non-contiguous), sub-channels or full bandwidth. Frames may also be contained in either one, n x 64 kbps, or n x 56 kbps data channels.
  • Supports decoding of frames with FCS of 16 bits and 32 bits, or none.
  • Capturing filter based on length of frames (FISU - Length as 5 and LSSU - Length as 7) can be set.
  • Call Detail Recording feature includes data link groups that help in defining the direction of the calls in a given network and form logical groups comprised of unidirectional (either 'Forward' or 'Backward') data links.
  • Recorded trace files can be played back using HDLC Playback application.

Additional features supported by Offline GPRS Analyzer:

  • Trace files for analysis can be loaded through simple command-line arguments.
  • Multiple trace files can be loaded simultaneously with different GUI instances for offline analysis.

Protocols Supported

The supported protocol interfaces in GPRS analyzer are Gb Interface.

Supported Protocols Specification Used
LAPF Q.922
BSSGP 3GPP TS 08.18 V8.10.0
LLC 3GPP TS 04.64 V8.7.0
GMM 3GPP TS 04.08 V7.19.0
SMS 3GPP TS 03.40 V7.5.0 / GSM 03.38 version 7.2.0
TOM 3GPP TS 04.64 V8.7.0 (2001-12)-Annex B
SNDCP 3GPP TS 04.64 V8.7.0
SMG 3GPP TS 04.08 V7.19.0
NS (Network Service Frame Relay) GSM 8.16 ETSI TS 101 299 V8.0.0

Click here to view the protocol glossary page for more information

Summary, Detail, and Hex-dump Views

The GPRS analyzer application is invoked from the main menu of GL's T1/E1 Analyzer for real-time analysis. The offline GPRS analyzer is invoked from the installation directory of the offline GPRS analyzer. GPRS (Gb) analyzer has three different panes i.e. Summary, Detail and Hex Dump Views. The Summary View for Gb interface displays Direction, Device Number, Frame Number, Time, Length, Time of Capture, Frame Error, DLCI Value, FECN Value, BECN Value, NS PDU Type, BSSGP PDU Type, SAPI Value, LLC Frame Type, N (S), N(R), N (U), Control Field Format, GPRS Mobility Management / Session Management Message Type, SNDCP Message Type, SMS Message Type etc. User can select a frame in Summary View to analyze and decode each frame in the Detail View. The Hex dump View displays the frame information in HEX and ASCII formats.

Screen Shot of Summary, Detail and Hex dump Views for Gb Interface

Real-time and Offline Analysis

Users can capture and analyze multiple GPRS interfaces in real-time and record all or filtered traffic into a trace file. The recorded trace file can be used for offline analysis, or exported to a comma-delimited file, or ASCII file.

For real-time capturing on Gb interface, users are required to specify timeslots, bit inversion, octet bit reversion, user/network side, FCS, and data transmission rate.

Screen Shot of Timeslot selection

Filtering and Search

Users can record all or filtered traffic into a trace file. Filtering and search capabilities is another powerful feature available with the GPRS Analyzer. These features isolate required frames from all frames in real-time as well as in off-line modes.

In Gb interface, 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 according to to Frame Number, Time, Length, Error, C/R, SAPI, CTL and more.

Similarly, Search capability helps user to search for a particular frame based on specific search criteria.

Screen Shot of Setting the Filtering Criteria

Call Detail Record and Statistics View

Important call specific parameters like Call ID, Call Status, Call duration, Device Number, BVCI, Call type etc are calculated for Gb Interface are displayed in the Call Detail Record View. for each individual call from the captured data. Call traces can also be logically grouped, with each group comprised of unidirectional (either 'Forward' or 'Backward') data links (applicable for Gb interface only). Additionally, users are provided with the option to search for a particular call detail record from the captured traces.

Statistics is an important feature available in GPRS analyzer and can be obtained for all frames both in real-time as well as offline mode.Various statistics can be obtained to study the performance and trend in the GPRS network based on protocol fields and different parameters.

Screen Shot of Statistics and Call Detail Record View for Gb Interface

Enhanced Trace Saving Options

Users can control the captured trace files by saving the trace using different conventions such as trace files with user-defined prefixes, trace file with date-time prefixes, and slider control to indicate the total number of files, file size, frame count, or time limit. This feature also allows the captured frames to be saved into a trace file based on the filtering criteria set using display filter feature.

Screen Shot of Enhanced Trace Saving Options Window

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. Any protocol field can be added to the summary view, filtering, and search features from this GUI providing the users more flexibility to monitor required protocol fields. All the configuration settings done in any of these options can be saved to a file, loaded from a configuration file, or user may just revert to the default values using the default option.

Screen Shot of Save/Load All Configuration Settings Window

Bridge and Monitor Connections

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
XX155 GPRS Protocol Analyzer
OLV155 Offline GPRS Protocol Analyzer
  Related Software
XX090 HDLC Capture and Playback Software (T1 or E1)
XX100 ISDN Analysis Software (T1 or E1)
XX120 SS7 Analysis Software (T1 or E1)
XX130 Frame-Relay Analysis Software (T1 or E1)
XX150 GSM Analysis Software (T1 or E1)
XX153 TRAU Analysis Software (T1 or E1)
  Related Hardware
PTE001 tProbe™ Dual T1 E1 Laptop Analyzer with Basic Analyzer Software
HDT001/HDE001 Legacy HD T1 or E1 (PCI) Cards 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

* Specifications and features subject to change without notice.

 Back to Protocol Analysis Index Page

Home Page Sitemap Global Presence Email