FarSync BERT Tester - PCIe

FarSync BERT front panel in RTD mode

A BER communications line quality tester for your Windows PC with a PCIe slot

Key Features

  • BER testing of 1 or 2 lines from your PC using a dual port low profile PCIe adapter
  • Tests lines using a set of BERT (Bit Error Rate Test) ITU recommended test patterns
  • Supports tests using NRZ, FM0, FM1, Manchester Encoding & Conditioned Di-phase line signalling
  • APIs for LabVIEW and native Windows test management applications
  • Operates in loopback or point-to-point modes including interoperation with other BER Testers
  • Connects to RS232, V.35, RS530, RS422, X.21, RS485 and RS449 network interfaces
  • Line speeds up to 10 Mbits/s and over
  • User controlled error injection facility and custom test patterns
  • Round trip delay testing - test the latency of your network


The FarSync BERT provides a comprehensive, simple to use, all in one, line testing utility for testing synchronous lines from your 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 full line test statistics are provided as well as support for user controlled error injection.

Lines with network interfaces RS232 (V.24), V.35, RS530 (EIA530), RS422, X.21 (V.11), RS449 and RS485 (4 wire) can be tested with line speeds ranging up to over 10 Mbits/s.

The FarSync T2Ee adapter is fitted in one your PC's PCIe slots; 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. Multiple FarSync BERT products can be run from a PC.

There is API access for LabVIEW or Windows applications, this allows programmatic control of when tests are run, the tests to be run, and the results obtained.

Video - operation, installation, features


Video - additional features

FarSync T2Ee BER Test PCIe card

PCIe low profile card for BER line testing - a full height PCIe bracket is also supplied.

Test Modes

  • 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 including interoperation with other suppliers BER Testers
  • Line tests can be invoked manually via the GUI, via batch command files or via the API
  • Tests can be run for a set number of bits or for a defined period of time

User Interface

The FarSync BER 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. A drop down window provides additional detailed test results.

Supported Network Interfaces

The FarSync BERT Tester products is supplied with the following cables, these are the most common network connector types used on synchronous lines.

  • RS232 (V.24) DTE - using cable FCR2
  • RS530 (RS422) DTE - using cable FCR2
  • X.21 (V.11) DTE - using cable FCR2 plus 2 TCX1
  • RS485 (4 wire) - using cable FCR2
  • RS499 (V.36) DTE - using cable FCR2 plus 2 TC449

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

  • V.35 DTE - using cable TCV1 (requires the FCR2 cable supplied with the product)
  • X.21 (V.11) DCE - using cable Null-MX
  • RS232 (V.24) DCE - using cable Null-MR4
  • RS530 (RS422) DCE - using cable Null-MR4

See the Order Information section at the bottom of the page.

Supported Line Data Encoding and Speeds

Line speeds up to over 10 Mbits/s are supported in all the encoding methods supported by the product.

  • NRZ
  • FM0
  • FM1
  • Manchester Encoding
  • Conditioned Di-phase

Test Patterns

A wide variety of pseudo random and fixed test patterns may be configured on the FarSync BERT used to test the line. ITU compliant test pattern recommendations are supported, these are compatible with other industry standard BER Testers.

The following pseudo random patterns are ITU-T compliant, they are 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 14 consecutive zeros

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

  • 1:7 (1/8, 1-in-8) - 1 mark followed by 7 spaces
  • 1/16 (1:15, 1-in-16) - 1 mark followed by 15 spaces
  • 2/8 (2:6, 2-in-8) - 2 marks in 8 bits (0100 0010...)
  • 3/24, 3-in-24 - 3 marks in 24 bits (0010 0010 0010 0000 0000 0000...)
  • MK - all 1s
  • SP - all 0s
  • 1:1 - alternating 1s and 0s
  • FOX (see ITU recommendation R.52 for definition)

In addition to the standard test patterns the user can supply their own custom test pattern of up to 64mB, test patterns do not have to be byte aligned.

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

  • Bits - number of bits received
  • Blocks - number of blocks received
  • Block Errors - number of blocks received with errors
  • Framing Errors - number of incorrectly framed asynchronous characters received
  • Parity Errors - number of asynchronous characters received with incorrect parity
  • 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 LabVIEW API allows the BERT functions to be invoked, and results to be read, by LabVIEW programs (VIs). Sample Vis are provided to illustrate the use of the API. All the features available from the GUI are supported by the LabVIEW API. Both 64 bit and 32 bit LabVIEW access is supported.

Diagram shows a LabVIEW synchronous V.24 (RS232) configuration.

Windows API

The BERT's COM API allows its functions to be invoked, and results supplied back, programmatically from Windows applications. All the features available from the GUI are supported by the COM API. Sample applications are supplied in Python, C# and VBS.

The FarSync BERT can also be used in command line/script mode with the configuration being specified by command line parameters - the results are written to a log file.

Round Trip Delay

The network latency can be measured using the round trip delay feature which is particularly useful for testing wireless networks. The results are shown as a readout and graphically with the spread of times measured.

Round Trip Delay display
Example round trip delay results

Other Features

  • Single or multiple bit errors can be injected at the user's request.
  • Line data can be inverted to support lines where the balanced pair data lines may have been swapped over or the data supplied has been inverted.
  • Inverted receive data can be automatically detected and converted as required.
  • Using the supplied loopback connector, the FarSync BERT Tester may be self tested prior to use.
  • Audible Alerts on errors and loss of sync.
  • Handling of custom clock rates.
  • Line clock speed display.

Windows Line Monitor

FarSync Line Monitor

The product is supplied with multi-channel line monitor software that allows the user to record, display and store line traffic transmitted and received by the BER testing, so for example the test patterns sent and received can be viewed.


Order Information



Product Code

FarSync BERT Tester - PCIe

BER (Bit Error Rate) line quality tester for testing synchronous lines from a PCIe card, tests X.21, RS232, V.35, RS422, RS485 (4 wire), RS530, RS449 network interfaces, it includes:
FarSync T2Ee - dual port low profile PCIe adapter (standard and low profile PCI brackets supplied)
BERT Tester - software for Windows 10, 8 and 7.
   1 FCR2 - dual port RS232, RS530, RS422, RS485 DTE connection (DB25M) cable
   2 TCX1 - X.21 connection (DB15M) DTE cable
   2 TC449 - RS449 connection (DB37M) DTE cable
   Loopback connector for self test.
Note: Requires a PC, not supplied.

Additional cables available
TCV1 V.35 DTE single port adapter cable, M34M connector, 0.5 metres, requires the FCR2 cable supplied with the product. FS6053
Null-MX X.21 double shielded crossover cable, DB15F connector to DB15F connector, 0.5 metres. Converts DTE presentation to DCE. FS6090
Null-MR4 Combined RS530 (RS422, EIA530) and RS232 (V.24) double shielded crossover cable, DB25F connector to DB25F connector, 0.5 metres. Converts DTE presentation to DCE FS6097