MT200X

MT-200X - GSM Data Protocol Analyser and Simulator

The MT-200X GSM Data Protocol Analyser, Simulator and Generator designed for testing the GSM network. Within the GSM network MT200X can be connected to any link witch has an E1 or T1 interface,e.g. the interface between the Base Transreceiver Station (BTE) and the Base Station Controller (BSC) , between a BSC and the Mobile Switching Center (MSC) , and in the interwork function (IWF).

The MT200X can also test ISDN PRI interface. It supports all data, fax , speech and signalling protocols in GSM. It is one of the most complete tester for GSM network on the marked today.

Screenshot of the MT-200X in action; Tandem Free Operation (TFO) protocol.
Screenshot of the MT-200X in action; Tandem Free Operation (TFO) protocol.

Key features:

  • Data to screen (Monitoring), Analysis, log file, to remote unit. without affecting the network.
  • Simulation via user defined programs for functionallity or conformance testing, base suite of programs provided.
  • Testing bof protocols sequences and procedures.
  • Testing frame synchronization, transmit and receve format, error detection, FCS errors, repeatbbility, long term stability, high load stability.
  • All speech codecs support (FR, HR, BTSM, AMR) and all Data and FAX protocols supported.
  • Signalling ( BSSAP, ISUP, BTSM, LAPD).
  • GSM/3GPP TFO support.

MT-200X Features

The standard system comprises an industrial PC running the Linux operating system and X-Window system, one interface card supporting dual channel monitoring and a basic software package.

Data simulation

Combining monitoring and simulation makes it easier to isolate and detect faulty situations, due to the fact that entire protocol layers may be emulated. And it is particularly strong in detecting logical errors, such as sequencing errors, bad acknowledgements, etc. These tests can be automated and run by the click of a button: The engineer would normally use a script that is earmarked to simulate special traffic or fault conditions. When running this type of script, the MT-200X will simulate an active, communicating network element, transmitting and receiving data - assisting the engineer in analysing the network conditions

Simulation scripts and system MT-C

Typically, companies using Moesarc protocol analysers will write their own data simulation scripts, and gradually assemble a library of useful scripts. Additionally, Moesarc Technology provides a set of sample scripts for the different protocols, and which may be customised to suit special needs or test requirements. We can also provide specialised scripts on demand, or give assistance in writing useful scripts.The MT-200X is equipped with a new and improved script system, MT-C, that makes it easier for users to write their own programs (scripts) for their specific needs. For users familiar with the older MT-100 and MT-200 products, MT-C is a greatly improved script language. For instance, MT-C is a free form editable language. This means that an ordinary text editor can be used to create and modify the scripts. Another advantage is that the MT-C syntax and semantics are almost identical to the widely used C programming language. Old scripts from the MT-100/MT-200 systems can be run on the MT-200X system

Signalling no.SS7

Our SS7 functionality has been developed to assist the user in configuring the MT-200X for the reception of data/fax and speech calls. The automatic traffic channel configuration is based on SS7 signalling on the A-interface in the GSM network. One interface card is connected to the line(s) comprising the data traffic. A second card continuously monitors the signalling and enables the unit to automatically set the traffic channel timeslot and protocol when the desired call is set up. A number of trigger options are available, including called or calling party phone number and now are extended to support ISUP/ BSSAP.

Triggers and filters

This feature allows the user to start file captures, monitoring sessions or initiate simulation scripts execution using a trigger. The different trigger types available are:

  • Time: Set a start and stop time as a trigger condition.
  • Frame types: Fire trigger if a certain frame type is received.
  • Error conditions: Fire trigger if CRC or sync errors detected.
  • Calling/Called phone number
  • Speech
  • Transparent Data
  • Non-Transparent Data

Timeslot monitor

The timeslot monitoring option allows continuous analysis of the type of traffic present on the different timeslots on the line at any given time. It does not rely on any external signalling information and distinguishes between the various low level data in addition to the data rates. Furthermore, the received information may be used to automatically set the basic protocol level, switch to the timeslot where traffic is present and commence monitoring and capture to file

Quality of Service verification

Test reports can be generated automatically by the system to give a general health check of the equipment being tested. The test report will contain the number of received packets, CRC errors, etc..

Remote operation

The MT-200X can be remotely operated from a PC or UNIX workstation that is capable of running X-client software (includes Windows9x/NT). Using an Ethernet connection over TCP/IP the unit can be remotely set up via a Telnet utility. Any remote unit capable of running X-client software (i.e. Windows9x/NT, a range of UNIX systems etc.) can connect to MT-200X and run the MT applications installed

MTReplay

MTReplay software runs under MS-Windows 9x/NT and is a tool for offline analysis of captured files. In addition to all the above protocols.

Data protocols supported

Protocol

Version
ITU-T V.110 Sync. 02/2000
ITU-T V.110 Async. 02/2000
ITU-T V.120 10/96
GSM 03.45 FAX Group 3 Transparent,T.30, T.4 and ECM 5.2.0
GSM 04.21 Sync. 7.0.3
GSM 04.21 Async. 7.0.3
GSM 04.22 RLP 5.6.1
GSM 06.10 Speech 7.0.2
GSM 06.20 Half rate speech 7.0.1
GSM 06.60 Enhanced full rate speech 6.0.1
GSM 06.90 Adaptive Multi-Rate speech 7.2.1
GSM 07.02 L2R COP 5.3.1
GSM 07.03 L2R BOP 5.2.1
GSM 08.20 A-TRAU Transparent and Non-Transparent 5.2.0
GSM 08.60 TRAU/E-TRAU 7.0.1
3GPP TS 48.060 6.0.0
3GPP TS 48.061 6.0.0
GSM 08.61 Half rate TRAU 7.2.2
GSM 08.62 TFO 8.0.1
3GPP TS 128.062 TFO 6.1.0
GSM 29.007 A-TRAU' 3.5.0
Async-to-Sync HDLC -
LAPB (ISDN PRI)
SMS (GSM 04.11,GSM 03.40,GSM 03.38) -
PPP/LCP/IPCP -
Internet Protocol (TCP/IP,UDP,ICMP, Http,FTP,POP,WDAP etc.) -
The Signaling functionality in MT-200X is available for several interfaces, i.e. GSM A interface (BSSAP), GSM Abis interface (BTSM), GSM IWF (BSSAP and ISUP), and ISDN PRI (LAPD). Besides normal test features like protocol analysis, call simulation, and call session registrations, MT200X provides automatic traffic channel (TCH) timeslot and protocol switching at call set up and release, based on signaling information detected on the related interfaces.

The following tables show the signaling protocols decoded in order to extract the necessary call set up parameters:

Protocols supported for BSSAP:

Protocol

Version Description
MTP 1 - 3
Message Transfer Part 1 to 3
SCCP
Signaling Connection Control Part
GSM 08.06 5.1.0 Transport mechanism specification BSS-MSC interface
GSM 08.08 5.8.0 MSC-BSS Layer 3 specification
GSM 04.07 5.2.1 Mobile radio interface Layer 3 general aspects
GSM 04.08 5.6.3 Mobile radio interface Layer 3 specification
SMS
GSM 04.11, 03.40, 03.38


Protocols supported for BTSM

Protocol

Version Description
LAPD
Message Transfer Part 1 to 3
SCCP
Signaling Connection Control Part
GSM 08.56 5.1.0 Transport mechanism specification BSS-MSC interface
GSM 08.58 5.8.0 MSC-BSS Layer 3 specification
GSM 04.07 5.2.1 Mobile radio interface Layer 3 general aspects
GSM 04.08 5.6.3 Mobile radio interface Layer 3 specification
SMS
GSM 04.11, 03.40, 03.38


Protocols supported for LAPD

Protocol

Version Description
L1
Physical Layer
LAPD
ITU-T
L3 5.1.0 Layer3


Operation System and GUI:

The MT-200X software runs on a standard PC under the Linux operating system (RedHat Fedora Core 4), where the user interface runs in the X Window graphical environment. The interface card driver works in a special loadable module for a standard Linux kernel.

Hardware:

A multi-purpose T1/E1 interface adapter, Thor-2-PCI Plus board, is used. An alternative is a Thor-2 PCMCIA board which supports almost the same functionality as the PCI board, but a limited capacity. The card supports two T1 or E1 interfaces at the speeds of 1.544 Mbps and 2.048 Mbps respectively. Two transmitters and two receivers are provided for each board. The operation mode, as well as the line terminating impedance, is software switchable. The card also supports a high-impedance mode for monitoring.

The line interfaces support several different line codes:

  • HDB3 - High Density Bipolar 3
  • B8ZS - Bipolar 8 Zero Substitution
  • AMI - Alternate Mark Inversion
  • AMI with NZC

For the E1 operation mode, Thor-2-PCI Plus supports the following framing formats:

  • Doubleframe
  • CRC-4 multiframe
  • CRC-4 multiframe G.706

Receiver characteristics, 2Mbit/s




BNC RJ45
Termination 75 Ohm, terminated
>2kOhm, unterminated
120 Ohm, terminated
>2kOhm, unterminated
Sensitivity 0.. -30dB 0.. -30dB
Clock Internal clock recovery Internal clock recovery
Line code HDB-3, AMI HDB-3, AMI
Frame format ITU-T Rec. G.704, double frame, CRC4 ITU-T Rec. G.704, double frame, CRC-4
Interface ITU-T Rec. G703 ITU-T Rec. G703


Generator characteristics, 2Mbit/s




BNC RJ45
Clock source Internal, external from receiver Ry (slave) Internal, external from receiver Ry (slave)
Line code HDB-3, AMI HDB-3, AMI
Frame format ITU-T Rec. G.704, double frame, CRC-4 ITU-T Rec. G.704, double frame, CRC-4


Receiver characteristics, 1.5Mbit/s




RJ45
Termination 100 Ohm, terminated
>2kOhm, unterminated

Sensitivity 0.. -30dB
Clock Internal clock recovery
Line code AMI or B8ZS
Frame format F4, F12, Extended Superframe CRC-6 or F72
Interface ITU-T Rec. G703


Generator characteristics, 1.5 Mbit/s




RJ45
Clock source Internal, external from receiver Ry (slave)
Line code AMI or B8ZS
Frame format F4, F12, Extended Superframe CRC-6 or F72

Status/alarm indication

PCM alarms: AIS, Loss of sync, No Signal, Remote Alarm, CRC4 errors, Slip

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