Technical Spec´s BERT USB *

© Farsite Communication Ltd. • 2012

Overview

The FarSync BERT provides a comprehensive, simple to use, all in one, line testing utility for testing asynchronous and synchronous lines from your Laptop PC. There are no extra expensive modules to buy to test different line types. All the popular standard BERT test patterns can be selected; the test period can be controlled; real time error counters and user controlled error injection with full line test statistics are provided.

Lines with network interfaces RS232C (V.24), V.35, RS530 (EIA530, RS422), X.21 (V.11) and RS449 can be tested with line speeds ranging from 15 baud up to 2 Mbits/s.

The FarSync BERT adapter is simply plugged into any of your Laptop's USB ports; select one of the cables provided to connect to the line to be tested; the BERT application can then be started and the line quality results are displayed in real time.

FarSync BERT will run on Windows 7, Vista and XP. Line Monitor software is also included in the product, supporting Wireshark. Line Monitor cables are ordered separately.

see also the
Demonstration Video

Test Modes

        • The USB Adapter for BERT line testing and Line Monitoring
        • The FarSync BERT Tester can act as either the physical DTE or DCE
        • The tests can be run in loopback or point-to-point modes
        • The tests can be invoked manually via the graphical user interface or via batch command files

User Interface

The FarSync BERT Tester has a full graphical user interface (screen shot at the top of the page) that enables the user to select and configure the test to be run. The final test results are displayed via the user interface. The status of each test is reported in real-time via the GUI whilst each test is being run. Drop down windows provide additional detailed test results.

Test Patterns

A wide variety of pseudo random and fixed test patterns and test messages may be configured on the FarSync BERT Tester used to test the line.

Synchronous Lines

The following pseudo random patterns can be used to test synchronous lines:

        • 63: 26−1 – including a max of 5 sequential zeros and 6 sequential ones
        • 511: 29−1 – including a max of 8 sequential zeros and 9 sequential ones
        • 2047: 211−1 – including a max of 10 sequential zeros and 11 sequential ones
        • 215−1 – including a max of 14 sequential zeros and 15 sequential ones
        • 220−1 – including a max of 19 sequential zeros and 20 sequential ones
        • 223−1 – including a max of 22 sequential zeros and 23 sequential ones
        • QRSS: 220−1 – modified to transmit a maximum of consecutive zeros

The following fixed patterns can be used to test synchronous lines:

        • 1-8: 1 mark followed by 8 spaces
        • 1-16: 1 mark followed by 16 spaces
        • 3-24: 24 bit pattern of 1 mark and 3 spaces (3 times) followed by 15 consecutive spaces
        • all 1s
        • all 0s
        • alternating 1s and 0s
        • FOX

Asynchronous Lines

        • On asynchronous lines the following messages may be used:
        • 63: 26−1 – including a max of 5 sequential zeros and 6 sequential ones
        • 511: 29−1 – including a max of 8 sequential zeros and 9 sequential ones
        • 2047: 211−1 – including a max of 10 sequential zeros and 11 sequential ones
        • 1-8: 1 mark followed by 8 spaces
        • 1-16: 1 mark followed by 16 spaces
        • 3-24: 24 bit pattern of 1 mark and 3 spaces (3 times) followed by 15 consecutive spaces
        • all 1s
        • all 0s
        • alternating 1s and 0s
        • FOX

Line Error Reporting

The line test results displays industry-standard count values (e.g. ITU-T G.821) which help indicate the quality of the line under test:

        • Bits - number of bits received
        • Blocks - number of blocks received
        • Block Errors - number of blocks received with errors
        • Errored Secs (ES) / Unavailable Secs (US) - number of secs during which one or more errors has been detected
        • Severely Errored Secs (SES) - number of secs during which > 30% of blocks are in error or for which the bit error density is >10-2
        • Available Secs (AS) / Error Free Secs (EFS) - number of secs during which no errors have been detected
        • Loss of Sync (LOS) - number of times synchronisation has been lost

The result table shows error rates, expressed as a percentage or in scientific/engineering format.

Other Features

        • Single or multiple bit errors can be injected at the users command.
        • Received data can optionally be logged with test results.
        • Using the supplied loopback connector the FarSync BERT Tester may be self tested prior to use.
        • When connected to a USB 2.0 port lines up to 2 Mbits/s can be tested.

Supported Network Interfaces

The FarSync BERT Tester product is supplied with the following cables as these are the most common network connector types used on synchronous and asynchronous lines

        • V.35 DTE - cable name UCV1
        • X.21 (V.11) DTE - cable name UCX1
        • RS232C (V.24) DTE - cable name KCR1
        • RS530 (RS422) DTE - cable name KCR1

Additional cables supporting the following other interfaces may be purchased separately if required

        • X.21 (V.11) DCE - cable name UCX1-DCE
        • RS232C (V.24) DCE - cable name KCR1-DCE
        • RS530 (RS422) DCE - cable name KCR1-DCE
        • RS449 (V.36) DTE - cable name KC449

Supported Line Test Speeds

Synchronous: from 15 baud to 2 Mbits/s

Asynchronous: 2.4, 4,8, 9.6, 19.2, 38.4, 57.6, 115.2 Kbps/s

Windows Line Monitor

The product is supplied with a high performance multi-channel line monitor that allows the user to record, display, store and replay line traffic with protocol decoding. Comments can even be inserted into the line trace to assist later analysis.

The Line Monitor supported included with the FarSync BERT Tester allows the popular Wireshark Line Monitor software to be used to Monitor the data sent on the line that the FarSync Flex USB adapter is connected to.

To monitor both data directions on the line special line monitor cables are required, these cables are not included in the FarSync BERT Tester product but they can be ordered separately.

* All specifications are subject to change