FarSync T2Ee - The 2 Port Synchronous Low Profile PCI Express Card


FarSync products

The FarSync T2Ee PCIe card provides a very flexible 2 port PCI Express low profile synchronous communications platform for Linux and Windows systems


The FarSync T2Ee card and software is designed to provide high performance hardware communications solutions for business, government and military requirements who require a low profile PCIe synchronous communications card with externally sourced line clocks or able to generate a wide range of clock speeds internally. The product includes a low level driver that allows access to the communications features available in the hardware.

The card can optionally use the host's standard TCP/IP protocol stack to allow access to IP based networks such as the Internet. The FarSync SDK provides a Developers Toolkit for the product.

The T2Ee is a PCIe communications card with two independently configurable sync serial ports. Sync operation supports transparent bitstream and bitsync (HDLC) of up to 10 Mbits/s per line with a total card bandwidth of 40 Mbits/s. The highly flexible universal network connector supports RS232, X.21, RS422, RS530, RS449, RS485 and V.35 network interfaces.

Line signalling modes: NRZ, Manchester encoding, FM0, FM1 and Conditioned Diphase (Differential Manchester) up to 10Mbits/s are handled by the FarSite customisable communications controller as well as soft selectable line termination resistance.

The transparent bitstream option available with the APIs is suitable for VoIP (as a subsystem), video and voice such as T-DMB (Digital Multimedia Broadcasting), DAB (Digital Audio Broadcasting) ETI (Ensemble Transport Interface - ETSI EN 300 799).

Supplied with standard and low profile PCIe I/O brackets, the photo above shows the FarSync T2Ee fitted with the low profile PCIe I/O bracket and the one below with the standard I/O bracket.

The product is supplied with a free 5 year warranty.

Features under Windows

The FarSync T2Ee installs easily under Windows10, 8, 8.1, 7, Vista, Windows Server 2012 and 2008 on single- or multi-core systems under 32- or 6-bit. The T2Ee supports a Windows-based API, common to the entire range of FarSync cards/devices, it is referred to as the FarSync Windows API (FsWinAPI). This is an extension of the MS Win32 COMM API and enables, for example, applications developed to support COM ports, to be easily ported to use FarSync support in synchronous modes. This standardization enables the API to also be readily accessible from higher level environments such as .NET, C#, VB etc.

The FsWinAPI provides applications with direct access to the adapter's communications port/s for bit sync (HDLC) framing, LAPB, V.120, ETI (NI, V.11) and also transparent bitstream operation for video and voice type applications.

The FarSync T2Ee can also be installed to appear as a NDIS (LAN) interface so it can simply use the TCP/IP stack over PPP to allow access to IP based networks such as the Internet.

LabVIEW applications can access this card.

The product is supplied with a comprehensive configuration utility. The lines can be reconfigured and restarted without reloading the software. There is context sensitive help and an on-line manual should it be required. An advanced tab permits users to further specify the configuration of the line if necessary.

The product is supplied with its own Line Monitor that allows the user to record, display and store line traffic with WAN protocol decoding for fast debugging.

Features under Linux

The Char I/O API provides a programming language independent, high-level interface to the FarSync base driver it supports access to bit synchronous (HDLC) framed and transparent bitstream data.

The card can also use the TCP/IP stack to allow access to IP based networks such as the Internet. It also allows selection of the full range of clock modes.

The link level protocol used can be PPP, Cisco HDLC, LAPB (using hdlcX API) or Frame Relay with optional authentication by CHAP, MSCHAP or PAP (RFC 1334) thus providing a standard point-to-point network interface. ETI (NI, V.11) is supported with the FarSync SDK.

The card installs seamlessly as a plug and play device. The driver supports Linux kernel versions 2.6 and onwards including the leading distributions supplied by Redhat, SuSE, CentOS, Debian, Ubuntu, Fedora, Slackware and more. Multi-processor systems are supported. The driver is dynamically loadable so a kernel rebuild is not required for the driver to be installed. Driver source code is provided supporting both little endian and big endian memory storage formats.

FarSite is committed to supporting the cards on new versions of Linux and Linux kernels as they are released. The source code for the driver is supplied with the product allowing rebuilding by the end user for use with almost any of the current or future Linux variants. The driver supports both big-endian and little-endian memory storage formats.

A configuration utility is provided to set the line speed, interface type and protocol, after which the ports may be configured with standard networking tools.

Developers Toolkit

The FarSync SDK provides a Developers Toolkit with full documentation, useful utilities, such as a line monitor, and many sample applications for Linux and Windows.

Free support from FarSite's Engineering department is provided to customers purchasing the FarSync SDK who have technical questions using the API.

Typical Applications

The FarSync T2Ee suits a wide range of different applications, these include:

  • Low profile solution for synchronous ports
  • High speed multi-port HDLC framing support for non standard or specialist protocols
  • Multi purpose multi port communication card supplying a wide range of card generated clock speeds
  • Line connection card for LabVIEW application
  • Manchester Encoding and Conditioned Diphase for long, reliable, high speed self clocking lines
  • Interfacing DAB ETI (Ensemble Transport Interface - ETSI EN 300 799) transparent bit streams to Servers
  • Interfacing high speed MPEG Video bit streams T-DMB ETI to Servers
  • Custom or unusual protocols using the FarSite customisable communications controller

FarSync T2Ee - Product Details

FarSync T2Ee - synchronous low profile card
FarSync T2Ee fitted with the standard height PCIe I/O bracket


The FarSync T2Ee is supplied with software drivers for Windows and Linux. This includes a driver that allows access to the communications features available in the hardware and an optionally installable driver that connects with the standard TCP/IP protocol stack to allow access to IP based networks such as the Internet.

The drivers supplied with Windows and Linux allow large numbers of ports to be supported by the installation of multiple FarSync T2Ee cards in a Server. Typically 12 or more cards (24+ ports) can be supported; the card limit is only dependent on the resources available in the host Server and the total bandwidth of the PCIe bus.

Card Hardware

The card comprises an AMD processor with no wait state SRAM. The whole memory space may be mapped via the PCIe interface to the PC/Server. The AMD processor contains a dual embedded HDLC / transparent controller with SDMA access (128 buffers per port) and a full range of timers. A FarSite communications controller (customisable).

The T2Ee supports two synchronous ports which can run to speeds of up to 10 Mbits/s full duplex internally clocked and 10 Mbits/s externally clocked. Total bandwidth supported by the card is 40 Mbits/s.

Network Interfaces

The multi function line drivers available on both ports support X.21 (V.11), V.35, RS232 (V.24), RS422, RS530, RS449, RS485, network interfaces, all soft configurable and ESD protected from static charges.

Internally Sourced Clocks

Internally generated clocks to drive a serial communications port can be derived from either an on-board 8.192MHz clock (25ppm) and can be set to hundreds of different frequencies between 100 baud and 10 Mbits/s, some of pre-programmed list is in the table below. Many other frequencies can be synthesized to order, contact us to discuss your requirements.

100, 300, 600, 1200, 2400, 4800, 7200, 8000, 9600, 12000, 14400, 16000, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 32000, 33000, 33333, 33600, 36000, 38400,  40000, 40800, 43200, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000, 448000, 512000, 576000, 640000, 704000, 768000, 832000, 896000, 960000, 1000000, 1024000, 1088000, 1152000, 1216000, 1280000, 1344000, 1408000, 1472000, 1536000, 1600000, 1664000, 1728000, 1792000, 1856000, 1920000, 1984000, 2000000, 2048000, 2112000, 2176000, 2240000, 2304000, 2368000, 2432000, 2496000, 2560000, 2624000, 2688000, 2752000, 2816000, 2880000, 2944000, 3000000, 3008000, 3072000, 3136000, 3200000, 3264000, 3328000, 3392000, 3456000, 3520000, 3584000, 3648000, 3712000, 3776000, 3840000, 3904000, 3968000, 4000000, 4032000, 4096000, 4160000, 4224000, 4288000, 4352000, 4416000, 4480000, 4544000, 4608000, 4672000, 4736000, 4800000, 4864000, 4928000, 4992000, 5000000, 5056000, 5120000, 5184000, 5248000, 5312000, 5376000, 5440000, 5504000, 5568000, 5632000, 5696000, 5760000, 5824000, 5888000, 5952000, 6000000, 6016000, 6080000, 6144000, 6208000, 6272000, 6336000, 6400000, 6464000, 6528000, 6553600, 6592000, 6656000, 6720000, 6784000, 6848000, 6912000, 6976000, 7000000, 7040000, 7104000, 7168000, 7232000, 7296000, 7360000, 7424000, 7488000, 7552000, 7616000, 7680000, 7744000, 7808000, 7872000, 7936000, 8000000, 8064000, 8128000, 8192000, 9000000, 10000000.

Line Signalling Modes

NRZ plus the self clocking (clock for the data is decoded from the incoming data line) line signalling modes Manchester Encoding, Conditioned Diphase (also known as Differential Manchester), FM0 and FM1 at speeds of up to 10 MBits/s. This means separate clock lines are not required, these line signalling modes are a soft configurable alternative to NRZ and a reliable way of handling long high speed cable runs.

Line termination is supported on all the balanced pair signals for X.21 (V.11), V.35, RS422, RS530 (EIA530), RS449 and RS485 operation. The line termination resistors may be soft selected to be selected on a port by port basis. The addition of line termination resistors helps improve signal quality on long high speed lines.

Terminal Timing

Terminal Timing is supported to enable system-wide clock synchronisation.

PCI Express Bus Specification

The FarSync T2Ee card is suitable for systems with a PCIe bus, covering single and multi-processor systems. The card is compliant with PCI Express Base specification revision 1.0a and above. The FarSync T2Ee is a bus mastering, 1x (single lane) card.


FarSync T2Ee - Software Technical Specifications
Distribution Support

Distributions by Red Hat, SuSE, Slackware, CentOS, Ubuntu, Debian, Fedora and more.
Drivers for kernel versions 2.6 and onward on both single and multi-core 32 and 64 bit systems.

Kernel Support All sub versions of kernel releases from 2.6 and onwards.
Big Endian and Little Endian memory storage format drivers supplied.
Protocol Supported

TCP/IP, PPP, Cisco HDLC, LAPB, Frame Relay, CHAP, MSCHAP, PAP (RFCs 1661, 1332, 1334). Bitstream. ETI (NI, V.11) with the FarSync SDK.

API and Interfaces Char I/O API, hdlcX.
O/S Types

Windows10, 8.1, 8, 7, Vista, Windows Server 2012, 2008, LabVIEW running on a Windows O/S.
32 and 64 bit (single and multi-core systems).

Protocol Supported TCP/IP, PPP, LAPB, V.120, CHAP, PAP (RFCs 1661, 1332, 1334), ETI (NI, V.11), Bitstream.
API and Interfaces FSWinAPI, NDIS (LAN) where the line appears as a LAN interface.
Utilities Line Monitor to record, display and store line traffic included.
Hardware Technical Specifications
Card type and PCIe specification AMD Processor with embedded communications controller,
PCIe bus compliant with PCI Express Base Specification Revision 1.0a, x1 (single lane),
FarSite communications controller (customisable),
HD44F connector for the 2 synchronous ports,
Bus mastering card.
Network connection types
supported (with cables)

2 synchronous ports, soft switchable line termination,
RS232 (V.24) - DTE DB25M connector,
X.21 (V.11) - DTE DB15M connector,
V.35 - DTE M34M connector,
RS530 (RS422) - DTE DB25M connector,
RS449 (RS422) - DTE DB37M connector,
RS485 2 and 4 wire,
DCE type cables are also available

Link speed range sync

RS232: up to 128 Kbits/s.
X.21, V.35, RS422, RS530, RS449, RS485: up to 10 Mbits/s internally or externally clocked.

Line Signal Modes NRZ, Manchester Encoding, Conditioned Diphase (Differential Manchester), FM0 and FM1.
ESD line protection Littelfuse high speed ESD and over-voltage protection
Indicators 2 LEDs, one per port showing line connection status. 2 LEDs, one per port showing line connection status.
Maximum total bandwidth 40 Mbits/s
Line clocking - internal Internal clock range: over 160 different frequencies between 100 baud & 10 Mbits/s. See the complete list.
No special cables are required to use internal clocks. Internal clocking is supported on RS530, RS422, RS232, X.21, V.35 and RS449 connections.
Line clocking - external External clocks received from a serial port and used to a drive serial communication port can be any frequency up to 10MHz.
Terminal timing Terminal Timing is supported to enable system-wide clock synchronisation.
Approvals EN55022 class B, CE, FCC class B
MTBF 228,500 hours calculated using Bellcore Method 1 Case 3, 40 deg.C ambient, 15 deg.C case temperature rise above ambient.
Power requirements < 1.2 A @ +3.3v,
< 4 watts.
Operating Temperature Range 0–60°C ambient air temperature.
Physical characteristics Short card (height 64mm, length 167mm), standard and low profile PCIe I/O brackets supplied.
Cables Cables are ordered separately see the cable details table.
Warranty Free 5 year warranty.
RoHS2 Compliant Yes

Order Information
Product Name Description Product Code
FarSync T2Ee

PCIe synchronous 2 port bus mastering card (X.21 / V.35 / RS232 / EIA530 / RS422 / RS449 / RS485), bitstream and HDLC run-time support for custom applications plus TCP/IP operation on Linux and Windows.
NRZ, Manchester encoding, Conditioned Diphase, FM1 or FM0 selectable, other encoding can be developed to order.
FsWinAPI for Windows 10, 8.1, 8, 7, Vista; Windows Server 2012, 2008,
Char I/O and hdlcX API for Linux,
Cables are ordered separately.

FarSync SDK

Linux and Windows Developers Toolkit for the FarSync T2Ee and other FarSync cards - this is required if you want to write software to use the card's API.
Free support from FarSite's Engineering department is included for using the products APIs.



This two port adapter uses a single HD44F connector with the cable splitting out to two connectors. Two port cables are available for RS232, RS530, V.35, X.21 and RS449 operation. Details of the standard cables and DTE to DCE conversion cables available are listed below.

Order Information - Cables for the FarSync T2Ee
Product Name Photo Description Product Code
FCR1   One port RS530 and RS232 DTE cable  DB25M connector, 1.5 metres.
Also supports adaption to X.21, V.35 and RS449 interfaces with addition of conversion cables TCX1, TCV1 and TC449 respectively to allows mixed connection types.
FCR2 FCR2 Cable Dual port RS530 and RS232 DTE cable  DB25M connectors, 1.5 metres.
Also supports adaption to X.21, V.35 and RS449 interfaces with addition of conversion cables TCX1, TCV1 and TC449 respectively to allows mixed connection types.
FCX2   Dual port X.21 (V.11) DTE cable, DB15M connectors, 2.0 metres. FS6078
FCV2   Dual port V.35 DTE cable, M34M connectors, 2.0 metres. FS6079
FC449   Dual port RS449 DTE cable, DB37M connectors, 3.0 metres. FS6080
TCX1 TCX1 X.21 DTE (V.11) DB15M 1 port FCR2 cable to X.21 transition connector, 0.5 metres, see pinouts FS6052
TCV1 TCV1 Cable V.35 DTE M34M 1 port FCR2 cable to V.35 transition connector, 0.5 metres, see pinouts FS6053
TC449   RS449 DTE DB37M 1 port FCR2 cable to RS449 transition connector, 1.5 metres, see pinouts FS6054
Special Purpose Cables for all T-Series cards
Null-MX Null-MX X.21 double shielded crossover cable,
DB15F connector to DB15F connector, 0.5 metres.
Converts DTE presentation to DCE.
Suitable for FarSync T-Series cards, see pinouts
X21-EXT X21-EXT X.21 double shielded extension cable, 15 metres,
DB15F connector to DB15M connector.
Null-MR4 Null-MR3 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.
Suitable for FarSync T-Series cards.