Technical Spec´s X.25 USB *

© Farsite Communication Ltd. • 2012

The FarSync Flex X.25 USB adapter has been developed to provide high performance X.25 communications for Linux and Windows systems.

Overview

The FarSync Flex X.25 adapter is a high quality X.25 solution for business, government and military applications, it has been developed to provide high performance, versatile X.25 connectivity for Linux and Windows systems.

The bus powered USB adapter will support an X.25 line at speeds of up to 2.048 Mbits/s. The highly flexible universal network connector supports RS232C, X.21, RS422, RS530, RS449 and V.35 network interfaces.

Features under Linux

The Flex adapter installs seamlessly as a plug and play device under the popular Linux 32 and 64 bit distributions. The USB adapter is supported on Linux kernel version 2.6 in 32 and 64 bit formats, including the leading distributions supplied by Redhat, SuSE, CentOS, Mandriva, Debian, Ubuntu, Fedora, Slackware and more. SMP (multi-processor) systems are supported. Configuration is by a Java based GUI.

There are APIs to the X.25 layer, a Sockets based interface and a Java API. There is also an API to the ISO Transport layers (ISO 8073 - connection oriented).

IP over X.25 support is included permitting TCP/IP operation over an X.25 network.

XOT (X.25 over TCP/IP) support is available as an option, using the same API's as X.25. XOT can operate at the same time as X.25.

Up to 254 connections are supported as standard or up to 4095 connections using the FarSync X25 High Capacity Pack.

FarSite is committed to supporting the FarSync Flex X25 on new versions of Linux and Linux kernels as they are released. The source code for the driver and the libraries for the API are supplied with the product, allowing rebuilding by the end user for use with almost any of the current or future Linux variants.

Features under Windows

The Flex adapter installs seamlessly as a plug and play device under Windows 7, Windows XP, Server 2003, Server 2008 and Vista. 32 and 64 bit Windows operating systems are supported. Multiple Flex's can be installed.

The X.25 software has a host of features including ISO Transport (classes 0 to 3), support for OpenFT FTAM, a WinSock2 compliant Sockets API, a Java API, a COM Port 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. Up to 4095 connections can be supported using the FarSync X25 High Capacity Pack or 254 as standard.

IP over X.25 support is included permitting TCP/IP operation over an X.25 network.

X.25 Developers Toolkit: A comprehensive Developers Toolkit for development using APIs to X.25 and ISO Transport is included with each product covering Linux and Windows. A multi-port Line Monitor and a Line Statistics application are also supplied.

Typical Applications

The FarSync Flex adapter is suitable for connection to all types of X.25 networks, X.25 over the ISDN D channel and leased lines. Typical 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

        • SMS message gateways

        • Billing and Mediation

        • FTAM access

        • Lottery Terminals

        • ATM connections

The adapter is compatible with all public X.25 networks, such as Datex-P, BT X.25 Direct, Eirpac, Austpac, Transpac and Itapac to name just a few.

Key Features

The intelligent FarSync Flex X.25 has been designed for easy installation and to provide high performance in a variety of environments. The Flex adapter uses an ARM processors with Flash for the on board code.

        • 254 simultaneous SVC and PVC virtual connections or 4095 per port using the High Capacity Pack

        • XOT (X.25 over TCP/IP) support available as an option on Linux

        • Over 2,000 x.25 packets per second

        • Line speeds of up to 2.048 Mbits/s

        • Network interfaces for X.21 (V.11), V.35, RS232C (V.24, X.21bis), RS449, RS530 (EIA530, RS422)

        • Line signal modes NRZ up to 2.048 Mbits/s or NRZI, FM0 and FM1 up to 512 Kbits/s

        • USB 2.0 high-speed mode (480mb/s) and 1.1 compatible

        • High efficiency, USB Bus powered, energy saving design

        • Internal and external line clocking

        • Dual bank flash for secure in field upgrades and previous system restore capability

Configuration

The X.25 line can be reconfigured and restarted without reloading the software and the Flex supports hot plug in. 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 if necessary. For both Windows and Linux configuration is by a GUI configuration application, see a samples screens below:

Windows Port Manager showing configuration of a Flex for X.25

Linux Adapter Manager showing X.25 configuration of a Flex

APIs and X.25 Developers Toolkit

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.

TCP/IP over X.25

The IP over X.25 support is included as part of the FarSync Flex X25 product and is integrated into Linux, Windows XP and Server 2003.

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

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.

FarSync XOT Extension option

For Linux the XOT extension allows applications using the same API to transmit data over XOT (X.25 over TCP/IP). TCP/IP is normally routed over Ethernet on PCs and Servers. The XOT support is compatible with FarSite's FarLinx X.25 Gateway and also other manufacturers XOT products. The XOT and X.25 interfaces can be used simultaneously.

The FarSync XOT Extension for Linux is available under product code FS9508, it should be ordered at the same time that the FarSync X25 card is purchased, although a retrofit is possible.

Notes:

There is also FarSync XOT Runtime software for Linux available that allows XOT to run over the PCs standard TCP/IP connection such as an Ethernet card.

For Windows there is FarSync XOT Runtime software for Windows available that allows XOT to run over the PCs standard TCP/IP connection such as an Ethernet card.

FarSync X.25 High Capacity Pack option

An optional high capacity pack is available for the FarSync Flex X25. The FarSync X.25 High Capacity Pack allows up to 4,095 simultaneous connections to be made, a huge increase from the standard 254. The expanded capacity applies to SVC, PVC and ISO Transport connections.

Customer applications developed to use the standard X.25 Sockets API are compatible with the FarSync X25 High Capacity Pack.

The FarSync X.25 High Capacity Pack is available under product code FS9504 for Windows and FS9505 for Linux, it should be ordered at the same time that the FarSync Flex X.25 is purchased although a retrofit upgrade is possible. One FarSync X.25 High Capacity Pack is required per Flex device.

Packaging

The X.25 software firmware, drivers, utilities and the development toolkit are all included on the CD-ROM supplied with the FarSync Flex adapter. Cables are ordered separately.

The CD-ROM supplied with the FarSync Flex X25 includes:

      • Drivers for Linux, Windows 7, Windows XP, Vista, Server 2003 and Server 2003

      • Numerous example applications with source code

      • Documentation for all the APIs in Adobe PDF format

      • Source code for Linux drivers and API Libraries

Software Technical Specifications

Operation Systems supported

Windows XP, 32 and   64 bit versions of Windows 7, Vista, Windows Server 2003, Windows Server   2008.

Linux distributions supplied by Redhat, SuSE, CentOS, Mandriva, Debian, Ubuntu, Slackware, Fedora and others with kernel version 2.6.

Linux Kernel Support

Sub versions of kernel releases from 2.6.12 onward. The products may operate successfully with earlier versions of the kernel but no specific testing has been undertaken by FarSite

SMP (Multi-Processor Systems)

Yes, the software has been designed for and tested on SMP Servers

32 and 64 bit systems

The FarSync Flex X25 can be used on 32 and 64 bit systems under Linux and Windows


X.25 Features

X.25 CCITT compliance

1980, 84 & 88

DTE/DCE operation

Both and Automatic detection and selection

Maximum SVCs (all types)

254 sessions, any mix of bothway, incoming and outgoing
4,095 sessions using the High Capacity Pack, any mix of bothway, incoming and outgoing

Maximum PVCs

254 sessions 
4,095 sessions using the High Capacity Pack

Maximum simultaneous connections

254 connections 
4095 connections with the High Capacity Pack

Data Packet size range

up to 4096 bytes

Data packets per second throughput

more than 2000 pps

X25 facilities supported

Reverse charging, Closed User Group (CUG), Network User Identifier (NUI), Fast Select, Packet and Windows size negotiation, Extended sequence numbering (128), Throughput Class Negotiation.

Types of network connection

X.25 packet switch, leased line, dial up (X.32 and dial on DTR)

Accessible via API

Yes, a number of different APIs to suit various requirements

IP over X.25

Supported, complies with RFC 1356 on Linux and Windows

X.25 switch

X.25 Switch daemon available on Linux for free download for use with the FarSync Flex X.25


XOT Option Features

XOT Specification

Complies with RFC 1613 - X.25 over TCP (XOT)

Maximum XOT connections

1,000 on Linux, 4,095 on Windows

Maximum SVCs and PVCs

1,000 on Linux, 4,095 on Windows (any mix of SVCs and PVCs)

Data packets size range

0 to 4,096 bytes

OOB (Out of Band) data

Supported for Interrupts, Resets and the D bit

X25 facilities supported

Closed User Group (CUG), Network User Identifier (NUI), Fast Select, Packet and Windows size negotiation, Throughput Class Negotiation.

Accessible via API

Two APIs, a Sockets based interface, a Java API


ISO Transport Features

Supplied   with the X.25 software

Included with both the standard product and the High Capacity Pack

Standard supported

ISO 8073 (connection oriented)

Classes supported

Classes 0, 1, 2 and 3

Negotiation between classes

Yes

Simultaneous transport connections

254 sessions,
 4,095 sessions using the High Capacity Pack

Accessible via API

Yes


Hardware Technical Specifications

General

Intelligent USB adapter with ARM processor, dedicated RAM and dual bank Flash memory,
Field upgradeable onboard firmware,
USB Bus powered, USB 2.0 (high-speed - 480Mb/s mode) and 1.1 compatible,
Network line connector: HD26 for connection of network cables
Hot plug in supported

Physical characteristics

Size: - Height 30mm, Length 126 mm, Width 62mm
Material: Anodised extruded aluminium
Weight: 190g
0.6 metre A to B type USB cable with screw in fitting into the Flex adapter

Multiple adapters

Yes, typically 8 or more Flex adapters can be   supported; the adapter limit is only dependent on the number of powered USB   ports available. The FarSync Flex X25 can also be mixed with FarSync X25 T-Series cards

Network connections supported

X.21 (V.11) - DTE 15 pin male D type,
V.35 - DTE MRAC-34 male 'brick' type,
RS232C (V.24, X.21bis) - DTE 25 pin male D type,
RS530 (RS422) - DTE 25 pin male D type,
RS449 - DTE 37 pin male D type

Line Signals Modes

NRZI, FM0 and FM1 up to 512 Kbits/s, NRZ up to 2.048 Mbits/s

Link speed range

RS232C: up to 128 Kbits/s
X.21, V.35, RS530, RS449, RS422: up to 2.048 Mbits/s

ESD protection

Yes, Littelfuse high speed ESD and over-voltage protection

LED line status indicators

1 line status

Approvals

EN55022 class B, CE, FCC class B

Operating Temperature Range

0–55°C ambient air temperature

Power requirements

USB Bus powered, < 100 mA on startup, < 500 mA on full load, < 1.6 watt

MTBF

308,000 hours - calculation based on Bellcore Method 1 Case 3, 40 deg. C ambient, 15 deg. C case temperature rise   above ambient.

Line clocking (internal/external)

Both, Adapter generated clock range 9,600 baud to 2 Mbits/s on X.21, V.35, RS232C, RS422, RS530 and RS449

Cable type compatibility

Cables are ordered separately.

Warranty

Free 5 year warranty

RoHS   Compliant

Yes

*All specifications are subject to change