X.25 Adapters general information and comparison table

FarSync X.25 Adapters Overview and Product Comparison

The FarSync X.25 product family includes a range of USB, PCI express (PCIe), Universal PCI, PMC X25 adapters and XOT software developed to provide very high performance communications for Servers, PCs and Laptops running Linux and Windows.

The FarSync X.25 range of adapters have been developed to provide very high performance X.25 connectivity for Linux and Windows

The 2 and 4 port Universal PCI and 2 and 4 port PCI Express (PCIe) adapters in the range are capable of driving each line at speeds of over 2,048 Mbits/s with support for RS232, X.21, V.35, RS449, RS530 and RS422 network interfaces.

The USB adapter can support 1 port up to 2,048 Mbits/s with network interfaces RS232, X.21, V.35, RS449, RS530 and RS422.

The PMC adapters can support 2 ports and are capable of driving each line at speeds of over 2,048 Mbits/s with support for RS232, X.21, V.35, RS449, RS530 and RS422 network interfaces.

The X.25 software has a host of features including IP over X.25, a Sockets API, and a Java API. A comprehensive development toolkit that includes many sample applications for each API is supplied as part of the product. Using the High Capacity Pack up to 4095 connections can be supported on each line. For Linux there is an option of XOT support.

A fully featured GUI multi-port Line Monitor and a Line Statistics application is included with the products.

FarSync X.25 Products Comparison Table
FarSync X.25 adapter specification product comparison overview
Features can vary between the Linux and Windows implementations
	USB	PMC		PCI / PCI-X (Universal PCI)			PCI Express (PCIe)
Product Name	FarSync Flex X25	FarSync X25 T2U-PMC-F	FarSync X25 T2U-PMC-R	FarSync X25 T2U	FarSync X25 T4U	FarSync X25 T4E+	FarSync X25 T2Ue	FarSync X25 K2Ee	FarSync X25 T2Ee	FarSync X25 T4Ue	FarSync X25 T4Ee
Product Code	FS6100	FS6280	FS6281	FS6240	FS6440	FS6446	FS6250	FS6266	FS6256	FS6450	FS6456
Hardware Features
Adapter Bus Type	USB 3.0 or 2.0	PMC (PCI mezzanine)		FarSync PCI cards comply with the Universal PCI (PCI-X compatible, PCI v2.2 compliant) specification. These bus mastering cards are suitable for systems with a PCI bus, covering single and multi-processor systems.			FarSync PCIe cards are suitable for systems with a PCIe bus, covering single and multi-processor systems. These cards are compliant with PCI Express Base specification revision 1.0a and above. The FarSync adapters are bus mastering, 1x (single lane) cards.
Max Port Count	1 port	2 ports	2 ports	2 ports	4 ports	4 ports	2 ports	2 ports	2 ports	4 ports	4 ports
Multiple adapters in a PC	8 or more	Multiple: PMC site count dependant	Multiple: PMC site count dependant	12 or more	12 or more	12 or more	12 or more	12 or more	12 or more	12 or more	12 or more
Network Interfaces	RS232, X.21, V.35, RS449, RS530, RS422.	Front and Rear I/O: RS232, X.21, V.35, RS449, RS530, RS422.	Rear I/O: RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.	RS232, X.21, V.35, RS449, RS530, RS422.
Line signal encoding	NRZ, FM0, FM1, NRZI	NRZ	NRZ	NRZ	NRZ	NRZ, FM0, FM1, Conditioned diphase, Manchester encoding	NRZ	NRZ, FM0, FM1, Conditioned diphase, Manchester encoding	NRZ, FM0, FM1, Conditioned diphase, Manchester encoding	NRZ	NRZ, NRZI, FM0, FM1, Conditioned diphase, Manchester encoding
Adapter Size	N/A	PMC card	PMC card	Half card	Half card	Half card	Half card	Low profile half card	Low profile half card	Half card	Half card
Max Line Speed	2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s	> 2,048 Mbits/s
Extra ESD Protection	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Data Packets per Second	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps	> 2000 pps
Approvals / Compliance Declarations	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH	EN55022 class B, CE, FCC class B, RoHS2, REACH
Operating Temperature range	0 to 55°C ambient air temperature	-40°C to 70°C ambient air temperature	-40°C to 70°C ambient air temperature	0 to 60°C ambient air temperature. Wider temperature version available on special order.	0 to 60°C ambient air temperature. Wider temperature version available on special order.	0 to 60°C ambient air temperature. Wider temperature version available on special order.	0 to 60°C ambient air temperature.	0 to 60°C ambient air temperature.	0 to 60°C ambient air temperature.	0 to 60°C ambient air temperature.	0 to 60°C ambient air temperature.
Internal/External Line Clocking	Both	Both	Both	Both	Both	Both (very wide range of internal clocks), Terminal Timing	Both	Both (very wide range of internal clocks), Terminal Timing	Both (very wide range of internal clocks), Terminal Timing	Both	Both (very wide range of internal clocks), Terminal Timing
Cables	Order separately, see the Products Order Information	Order separately, see the Products Order Information	not supplied	Order separately, see the Products Order Information	Order separately, see the Products Order Information	Order separately, see the Products Order Information	Order separately, see the Products Order Information	Order separately, see the Products Order Information	Order separately, see the Products Order Information	Order separately, see the Products Order Information	Order separately, see the Products Order Information
Software Features
X.25 software	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included
X.25 CCITT Compliance	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88	1980, 84 & 88
DTE/DCE Operation	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select	Both & Auto Select
Max SVCs / PVCs (all types)	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack	254 per line, 4095 per line with high capacity pack
Data Packet size range	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096	16 to 4096
X.25 Developers Toolkit	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included
On-Line API Reference Manuals	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included
C, Java and Visual Basic sample programs	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included	Included
X.25 High Capacity Pack Option - Supported	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
XOT option on Linux	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
32 and 64 bit support on Windows and Linux	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Operating Systems supported	All the adapters support Linux and Windows FarSync adapters support Linux kernel versions from 2.6.12 onwards, in 32 and 64 bit formats, including the leading distributions supplied by Red Hat, SuSE, CentOS, Ubuntu, Debian, Fedora, Slackware and more. FarSite is committed to supporting FarSync adapters on new versions of Linux and Linux kernels as they are released. The FarSync adapters install easily under Windows 11, 10, Windows Server 2025, 2022, 2019, on single or multi-core 32 and 64 bit systems. The FarSync drivers are signed by Microsoft for easy installation. For use on earlier Windows versions contact FarSite.