FarSync X25 M-Series PCMCIA adapter. The X.25 PC Card solution for Windows

FarSync X25 M1P card

The FarSync X25 M-Series PCMCIA adapters provide high performance X.25 communications for Laptops and PCs using PC Cards

April 2016: This product is End of Life, contact us.

Product Overview

The FarSync X.25 M1P v2 adapter has been developed to provide high performance X.25 connectivity for Windows XP, Vista, Server 2003 and Server 2008. The 1 port PCMCIA card can utilise lines up to 512 Kbits/s with support for  RS232, X.21, RS530 (RS422) and V.35 network interfaces.

The X.25 software has a host of features including ISO Transport (classes 0 to 3), IP over X.25, support for OpenFT FTAM, a WinSock2 compliant Sockets API, a Java API, a low level NCB API and a LAPB layer 2 (HDLC) that is also directly accessible by its own API. The Sockets API is also accessible from .NET applications.

The FarSync X25 cards and software are well proven and very reliable making them ideal for non stop applications.

When used in conjunction with a low profile PCI to PCMCIA adapter the FarSync X25 M1P v2 card provides an economic X.25 solution for low profile servers with PCI slots.

A comprehensive Developers Toolkit is included with each product together with a GUI multi-port Line Monitor and a Line Statistics application.

Watch our informative video about our X.25 products

Typical Applications

The FarSync X25 M-Series PCMCIA cards are suitable for connection to all types of X.25 networks, X.25 over the ISDN D channel, Dialup X.25 and leased lines. Example applications include:

  • Private X.25 networks such as Lottery, Police, Customs, Military, Fishery, Financial, Government and Airline
  • E-Commerce gateways for credit verification
  • Mixed X.25 and IP networks
  • FTAM access
  • Billing and Mediation
  • X.25 connections to Laptops including military Laptops
  • X.25 solution for low profile PCI Servers (in conjunction with a low profile PCI to PCMCIA adapter)

The card is compatible with all public X.25 networks, including: Datex-P, BT X.25 Direct, Eirpac, Austpac, Transpac, Iberpac and Itapac and many more.

Application Development

Application developers have a choice of APIs for X.25 and ISO Transport. An API selector guide is provided to assist the developer in choosing the most appropriate interface. The comprehensive Developers Toolkit is included with the product.

Sockets API - X.25

The Sockets API is extremely popular as a simple, easy to use API to access TCP/IP communications networks. The Sockets support for the FarSync X25 M1P retains this ease of use and also allows the special features of X.25 and ISO Transport classes 0 to 3 to be accessed.

The Sockets interface is WinSock2 compliant, it supports standard AF_ISO / ISOPROTO_X25 sockets used by a number of applications, such as MS-Exchange. It also supports an alternative address family, AF_X25, to allow easy porting of applications between Windows and Linux.

The FarSync Sockets API is compatible with the Microsoft defined X.25 Sockets API. Applications written to use the Microsoft X.25 Sockets API will work with the FarSync product.

Applications developed in most programming languages including Visual Basic, Delphi, C++ and .NET applications can use the Sockets API to the FarSync X25 M1Pv2.

More details on the X.25 Sockets API.

Java API - X.25

The Java API allows applications written in Core Java Software (J2SE) and Enterprise Java Software (J2EE) easy access to the functions and features of X.25 offered by the FarSync X25 M1P card. Full documentation and sample applications are provided.

NCB API - X.25 and ISO Transport

A legacy API is supplied to maintain compliance with older X.25 cards, access to ISO Transport and X.25 is provided.

Developers Toolkit

The X.25 Developers Toolkit is included with the FarSync X25 products and features:

  • Documented working sample programs for Linux and Windows, including in C, Java, Visual Basic and Delphi. Source code from these samples can be used to fast-track your development process
  • Comprehensive set of API manuals with function call definitions and helpful advice on the best way to utilise the various interfaces
  • Free email and telephone assistance to the application developer using the APIs

Download the X.25 Developers Toolkit.

TCP/IP over X.25

The IP over X.25 support is included as part of the FarSync X25 M1P product, it is fully integrated into Windows

Configuration is performed using standard network configuration menus.

Windows Features: The IP over X.25 support complies with RFC 1356 (IP over X.25), for single and multiple X.25 destinations. Higher level protocols that run over IP including TCP, UDP, HTTP and FTP are supported.

IP over X.25

See further details about how IP over X.25 works

Card Performance

The intelligent FarSync M-Series card offers high performance in a small package. The software supports a full set of X.25 features whilst still providing high data packet throughput.

  • Up to 254 simultaneous virtual connections
  • up to 500 pps (data packets per second)
  • Line speeds up to 512 Kbits/s
  • X.21 (V.11), V.35, EIA-530 (RS530, RS422) and RS232 (V.24 / X.21bis) network interfaces

Fast Installation and Configuration

The card features 'Plug and Play' support for Windows XP, Vista, Server 2003 and Server 2008. Fast installation and easy configuration are a feature of the product.

There is context sensitive help and an on-line manual. Many of the parameters such as DTE / DCE selection are determined automatically. Selecting the line speed by default automatically sets suitable timer and retry values. An advanced tab permits users to exactly specify the configuration of the line should it be required (click here for example).

Line Monitor and Network Statistics Utilities

The product includes a multi-port line monitor, an invaluable tool when testing new applications and commissioning new systems. Line traces can be displayed in real time, recorded and reviewed with full protocol decoding, comments can even be inserted in the trace to assist later analysis. Click here for a sample screen.

A connection status and statistics utility is also provided. Its functions include the display of the channel connection status and statistics of user data, packet and frame types passed over the X.25 lines.


The X.25 software, utilities, IP over X.25 support and the development tool kit are all included on the CD-ROM supplied with the FarSync communications adapter. Cables are ordered separately. New releases of X.25 software for FarSync cards are made available for download from the Support section X.25 download page.


Cables are available for the adapter with X.21 (V.11 - DB15M type), RS232 (V.24 DB25M type), V.35 (M34M type) and EIA-530 (RS530/RS422) DB25M connectors.

The FarSync X25 T and M Series product range and compatible cables table lists the cables available by card type. Crossover cables, sometimes referred to as null modem cables are also detailed.

Technical Specifications - Software Features
Operating Systems supported Windows 7, XP, Vista, Windows Server 2003, Windows Server 2008
Line Monitor Yes, multi port, decodes and displays frame, packet and data levels. Traces can be logged to file and reviewed. Insert text comment facility.
X.25 Software Features
Data Packets per Second > 500 pps throughput
X.25 CCITT Compliance 1980, 84 & 88
DTE/DCE Operation Both & Auto Select
Maximum SVCs (all types) 254, any mix of bothway, incoming & outgoing
Maximum PVCs 254
Logical Channel Numbers (LCN) From 1 to all 4096 LCNs can be specified. Allows incoming calls to be accepted on any channel
Data Packet size range 16 to 4096 bytes
Reverse Charging option Yes
Closed User Group (CUG) option Yes
Network User Identifier (NUI) Yes
Fast Select Yes
Packet & Window size negotiation Yes
Throughput class negotiation Yes
Extended sequence numbering (128) Yes
IP over X.25 Included, supports RFCs 1356, 1598 & 1662
Accessible via API Yes, 4 APIs available (Sockets API, Java, NCB)
ISO Transport Features
Standard supported ISO 8073 (connection oriented)
Classes supported Classes 0, 1, 2 and 3
Negotiation between classes Yes
Transport connections 254
Accessible via API Yes, Sockets API (Winsock2)
Development Toolkit
X.25 APIs on Windows
  • Sockets API, easy to use, provides access to the majority of X.25 features, recommended for most developments
  • Java API, specially developed for Java applications (J2SE, J2EE), quick and easy to use.
  • HDLC API provides a programming interface into LAPB (X.25 Layer 2). an alternative API is provided to raw HDLC frames, with the API just providing the CRC generation and the framing.
  • NCB API A legacy API to maintain compliance with older products only.
ISO Transport API on Windows Sockets API, providing access to all the features of the ISO Transport support. Can operate simultaneously with access to the X.25.
NCB based API, legacy API providing access to all the features of the ISO Transport support. Can operate simultaneously with access to the X.25.
API reference manuals X.25 Sockets API manuals, Java API documentation, ISO Transport API manuals, NCB API manuals, HDLC API Manuals
Sample programs Included, large number of example applications are available for driving all the various APIs. Includes samples for SVC and PVC operation
Technical Specifications - General and Hardware Features
Product Name FarSync X25 M1P v2
Product code FS6133
Warranty Free 5 year warranty
Hardware Features
Card type PCMCIA type II PC Card
PC card cable connector FCI rocard
Max port count 1 port
Multiple cards in a PC yes, 2 or more
Network Interfaces RS232 (V.24) - DB25M type,
X.21 (V.11/ RS422) - DB15M type,
V.35 - M34M type,
EIA-530 (RS530) - DB25M type,
RS449 can also be supported
Link speed range RS232: up to 128 Kbits/s
X21, V35, EIA-530: up to 512 Kbits/s
ESD protection Yes, Littelfuse high speed ESD and over-voltage protection
Approvals EN55022 class B, CE
RoHS2 Compliant
MTBF 468,787 hours. Bellcore Method 1 Case 3, 40 deg.C ambient, 15 deg.C case temperature rise above ambient
Power requirements < 150 mA @ +5v
< 0.75 watts
Cable type compatibility Cables are ordered separately, see Cables for FarSync M-Series cards
Internal/External Line Clocking Both external and card generated. The card generated clock range is from 9,600 baud to 512 Kbits/s on RS232 and X.21 type connections only. No special cables are required to use card generated clocks.