Technical Spec´s WAN T4E *

© Farsite Communication Ltd. • 2012


The FarSync T4E+ card and software is designed to provide high performance hardware communications solutions for business, government and military requirements who need a Universal PCI synchronous communications card with externally sourced line clocks or highly adaptable control of line clocks. The product includes a low level driver that allows access to the communications features available in the hardware.

The cards can optionally use the host's standard TCP/IP protocol stack to allow access to IP based networks such as the Internet.

T4E+ is a Universal PCI communications card (PCI and PCI-X compatible) with four independently configurable sync/async serial ports with an external synchronisation capability (eg sourced from GPS). Sync operation supports transparent bitstream and bitsync (HDLC) of up to 10 Mbits/s per line with a total card bandwidth of 64 Mbits/s. The highly flexible universal network connector supports RS232, X.21, RS530 (RS422 signalling), RS449 (RS422 signalling) and V.35 network interfaces.

Line signal modes: NRZ, Manchester Encoding, Conditioned Diphase, FM0, FM1 up to 10Mbits/s as well as soft selectable line termination resistance.

One of the unique features of the T4E+ is the huge variety of clock source options, clocks can be:

        • Internally generated using a local clock generator
        • External from the WAN communications line
        • External via a special CTBus (H.100) clock bus connector
        • Sourced on one port then routed to the others
        • Sourced from a T4E+ then routed down the CTBus to other T4E+s (and other cards supporting the CTBus) to allow clock synchronisation to be maintained.
        • Multiplied or divided per port to obtain the required rate
        • Independently configurable for each line

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).

Typical Applications

The FarSync T4E+ suits a very wide number of different applications these include:

        • Reproduction of legacy Audio streams across the TCP/IP networks (VoIP) using Satellite (GPS) clock source synchronisation
        • 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
        • High speed multi-port HDLC framing.
        • Use of bitstreaming for the implementation of non standard or specialist protocols
        • Network clock synchronisation
        • Multi purpose multi port communication card supplying a wide range of card generated clock speeds
        • Line connection card for LabVIEW applications
        • Manchester Encoding or Conditioned Diphase for long, reliable, high speed self clocking lines

Features under Windows:

The Windows based API common to the entire range of FarSync cards/devices is referred to as the FarSync Windows API (FsWinAPI). This is an extension of the MS COMM API and enables, for example, applications developed to support COM ports, to be easily ported to use FarSync support in synchronous or asynchronous modes. This standardization enables the API to also be readily accessible from higher level environments such as .NET, C#, VB etc. The special clocking features are all accessible though the FsWinAPI. Async support is also provided by the Win32 COMM interface as well as FsWinAPI.

The FsWinAPI provides applications with direct access to the card's communications port/s for bit sync (HDLC) framing and also transparent bitstream operation for video and voice type applications.

The FarSync T4E+ 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.

The card installs seamlessly under Windows 7, Vista, Windows XP, Windows Server 2003 and Windows Server 2008 on both 32 and 64 bit, single and multi-core systems. The FarSync drivers are signed by Microsoft for easy installation.

LabVIEW applications can access this adapter.

The product is supplied with a comprehensive configuration utility, typical screens are shown below. 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, transparent bitstream and asynchronous data. The cards 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 can be PPP, Cisco HDLC or Frame Relay with optional authentication by CHAP, MSCHAP or PAP (RFC 1334) providing a standard point-to-point network interface.

The card installs seamlessly as a plug and play device. The driver supports Linux kernel version 2.6 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.

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.

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.

FarSync SDK - The Developers Toolkit

The FarSync SDK includes support for writing applications on both Linux and Windows and contains documentation, working sample applications, development and test utility applications. There is everything a user needs to rapidly develop and test a wide variety of applications such as specialist synchronous (HDLC framed) protocols or transparent bitstream data requirements including Audio, MPEG Video T-DMB and DAB ETI with bitstream encoder and decoder. The FarSync SDK is ordered separately from the FarSync T4E+.

FarSync T4E+ Product Details

The cards are supplied with software drivers for Windows and Linux. This includes a low level 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 T4E+ cards in a Server. Typically 12 or more cards (48+ ports) can be supported; the card limit is only dependent on the resources available in the host Server and the total bandwidth of the PCI bus.

Card Hardware

The card comprises a AMD processor with no wait state SRAM. The whole memory space may be mapped via the PCI / PCI-X interface to the PC/Server. The AMD processor contains a quad embedded HDLC / transparent controller with SDMA access (128 buffers per port) and a full range of timers.

The T4E+ supports four 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 64 Mbits/s. A quad port UART (async controller) is included. Async or Sync operation is dynamically selectable on each port.

Network Interfaces

The multi function line drivers available on all the ports support RS232 (V.24), X.21 (V.11), V.35, RS530 (EIA530, RS422) and RS449 (RS422 signalling) network interfaces, all soft configurable and protected from static charges by ESD protection devices.

Clock Generation, Detection and Selection

Five on-board frequency synthesisers are configurable for generating clocks for the CTBus (H.100) and/or to the 4 serial ports.

Internally sourced clocks

Internally generated clocks to drive a serial communications port can be derived from either an on-board 8.192MHz clock (32ppm) or an CTBus bus clock and can be set to hundreds of different frequencies between 300 baud and 10 Mbits/s, the pre-programmed list is in the table below:

Some of the internally generated clock rates supported by the T4E+:

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.

Many other frequencies can be synthesized to order.

Externally sourced clocks


FarSync T4E+ Line Status Utility

External clocks received from a serial port and used to a drive serial communications port can be any frequency up to 10,000,000Hz.
A CTBus (H.100 bus) clock may be generated from a received serial port clock for the following sub-set of frequencies: 38400, 57600, 64k, 128k, 256k, 512k, 1024k, 2048k, 4096k and 8192k.

Terminal Timing

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

Clock Routing

Clocks sourced from one port can be routed to drive the other ports.

Clock Speed Detection

A 16-bit timer enables differentiation between the clock frequencies, enabling auto-configuration of clock synthesisers when cables are connected.

H.100 Bus - Special clocking options

The cards support a subset of the CTBus (H.100) interface to enable synchronisation of serial port(s) to the H.100 bus (both master and slave modes), with CT_C8_A, CT_C8_B, CT_FRAME_A and CT_FRAME_B signals and jumper-selectable signal terminations. Serial port data is not frame aligned. This is of particular use in VoIP applications where a data on a line must be exactly reproduced at another location without slip.

In CT_Bus Slave mode, the CTBus clock (auto-selected with A being primary) can be used as a clock source to derive serial port clock(s).

In CT_Master mode, the CTBus clock (either A or B) can be derived from either a received serial port clock or an internal oscillator.

Use of the CTBus is supported by the Windows software only.

PC / Server PCI and PCI-X Compatibility

The FarSync T4E+ card is suitable for a system with a PCI or PCI-X bus, covering single processor systems and multi-processor systems. The card is PCI revision 2.2 compliant with support for both 3.3 and 5 volt signalling, the power for the card is taken from the 3.3 volt supply rail. The cards may be fitted in either 32-bit PCI bus slots or 64-bit PCI-X bus slots as these Universal PCI cards will work perfectly well in both.

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 know as Conditional Manchester), FM0 and FM1 at speeds from 2400 baud 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, RS530 (EIA530, RS422) and RS449 (RS422 signalling) operation. The line termination resistors may be soft selected on a port by port basis. The addition of line termination resistors can be helpful in improving signal quality on long high speed lines.


This four port card uses a single large high density 100 pin HIPPI type connector, all four lines are available though this connector. The quad port cable HCR4 attaches to the card and splits out the four network interfaces into separate network connectors to provide support for EIA-530 (RS422) and RS232. X.21, V.35 and RS449 are available through transition connectors.

FarSync T4E+ - Software Technical Specifications


Distribution Support

Distributions by Red Hat, SuSE, Slackware, CentOS, Ubuntu, Debian, Fedora and more.
Drivers for kernel series 2.6 and 3.0 onwards on both single and multi-core 32 and 64 bit systems

Kernel Support

All sub versions of kernel releases from 2.6.1 and 3.0

Protocol Supported

TCP/IP, PPP, Cisco HDLC, Frame Relay, CHAP, MSCHAP, PAP (RFCs 1661, 1332, 1334)

API and Interfaces

Char   I/O API


O/S Types

Windows 7, XP, Vista, Windows Server 2003, Windows Server 2008, LabVIEW running on a Windows O/S.
32 and 64 bit (single and multi-core systems)

Protocol Supported

TCP/IP, PPP, CHAP, PAP (RFCs 1661, 1332, 1334)

API and Interfaces

FsWinAPI, NDIS (LAN) where the line appears as a LAN interface


Line Monitor to record, display and store line traffic included

Hardware Technical   Specifications

Card type and size

AMD processor with SRAM and quad port synchronous controller,
Universal PCI (PCI-X compatible, PCI v2.2 compliant), bus mastering, DMA enabled,
100 pin HIPPI connector for the network connections,
CTBus (H.100 bus) for external clocking connection,
Suitable for 32 and 64 bit PCI bus slots

Physical characteristics

Short card (height 107mm, length 167mm)

Network connections supported

4 synchronous or asynchronous ports
RS232 (V.24, X.21bis) - DTE 25 pin male D type,
X.21 (V.11) - DTE 15 pin male D type,
V.35 - DTE MRAC-34   male 'brick' type,
RS530 (EIA530, RS422 ) - DTE 25 pin male D type,
RS449 (RS422) - DTE 37 pin male D type

Link speed range Synchronous

X21, RS530, RS449, V.35: up to 10 Mbits/s internally or externally clocked, RS232: up to 128 Kbits/s.

Link speed range Asynchronous

RS232, X.21: 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38.4K, 57.6K & 115.2 Kbits/s

Maximum total bandwidth

64 Mbits/s

Line signal modes

NRZ, Manchester Encoding, Conditioned Diphase, FM0, FM1

Multiple cards

12 or more; only dependant of the number of PCI slots available on the server

Line indicators

4 LEDs one per port showing line connection status

ESD Protection

Yes, Littelfuse high speed ESD and over-voltage protection


141,438 hours calculated using Bellcore Method 1 Case 3, 40 deg.C ambient, 15 deg.C case temperature rise above   ambient


EN55022 class B, CE, FCC class B

Power requirements

< 1.75 A @ +3.3v,
< 10mA @ +/- 12v (for ESD suppression) 
< 6 watt. 
Note: 5 volt supply not required

Line clocking - internal

Internal clock range: over 160 different   frequencies between 300 baud and 10 Mbits/s.
No special cables are required to use internal clocks. Internal clocking is supported on RS530, 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 sport can be any frequency up to   10MHz.
  For a specific sub-set of frequencies (38400, 57600, 64k, 128k, 256k, 512k,   1024k, 2048k, 4096k, 8192k) an H.100 bus clock may be derived from a received   serial port clock.

Line Termination

Line termination resistors can be configured in or out.

Terminal timing

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

Clock speed detection

A 16-bit timer enables differentiation   between the clock frequencies listed above, enabling auto-configuration of   clock synthesisers when cables are connected.

H.100 Bus - special clocking options

Supports a subset of the H.100 interface to enable synchronisation of serial ports(s) to the H.100 bus in both master and   slave modes (Windows only).

RoHS Compliance



Cables are ordered separately


5   years

* All specifications are subject to change