Access 1000 X.25-TCP/IP Gateway

Features

• Single serial port configurable for speeds up to 10Mbps
• Up to 1024 SVC and/or PVC logical channel connections on the X.25 interface
• Encapsulation method configurable on a per connection basis
• Compatible with all legacy X.25 devices
• Easy to use web configuration GUI compatible with any Internet browser (HTTP and/or HTTPS)

Software

• Gateway connectivity between X.25 and TCP/IP devices or networks
• XOT (RFC 1613 - X.25 Over TCP)
• X.25 SVC and PVC – 1024 channels / link
• Comprehensive address matching and routing table
• Telnet and SSH remote management logins
• SNMP polls and link alarms
• User-friendly web interface for easy configuration and monitoring

Hardware

• RS232/V.24, V.35, X.21, RS530, RS449/V.36 sync/async port
• Synchronous speeds 1200bps to 10Mbps, internal or external clock
• 10/100-BaseT Ethernet port, auto-detection
• USB host port for serial adapter (1, 2, 4, or 8 port), or flash drive
• -48VDC powered or from 120/240VAC power adapter
• Dimensions: 5.625” x 1.25” x 3.45” (W X H x D); 0.5 pounds
• CE and RoHS

Chassis Enclosure – Rear View

Custom Enhancements

Please contact Microtronix sales with your custom design requirements.

X.25 to TCP Conversion

The X.25 to TCP conversion Gateway interfaces or bridges between X.25 and TCP/IP devices by interconnecting X.25 logical channels to TCP sockets using one of several encapsulation methods. The Gateway connects directly to X.25 DTE devices or to X.25 packet networks (DCE).

An important function of gateway conversion is the preservation of application messages. X.25 implementations delineate messages using packet sequences and a “More-bit” to reconstruct long messages. TCP, on the other hand, delivers messages as a non-delimited byte stream, and so requires the addition of an encapsulation header on top of TCP to preserve the boundaries of the message. Supported encapsulation methods include:

• XOT (RFC1613 - X.25 over TCP)
• RFC1006 Encapsulation (ISO Transport Service on TCP)
• Cisco RBP
• Odette FTP Encapsulation on TCP (as per RFC5024)
• 2-byte length header
• X.25 M-bit and Q-bit preservation header
• RAW (when no encapsulation header is required)
• Other encapsulation methods are available by request

X.25 over TCP Encapsulation (XOT)

An XOT gateway is typically used when the X.25 network or point-to-point connection between X.25 devices is being replaced with an IP network. By tunneling the X.25 packets over TCP, transparency is maintained while providing X.25 to IP address mapping and end-to-end X.25 logical channel number translation. X.25 devices do not need to be re-configured.

XOT to TCP Conversion

When an IP host supports X.25 on top of TCP (XOT) and relies on an external X.25 gateway to convert back to X.25, a second X.25-TCP gateway would be required for conversion to a TCP/IP device. The Access 1000 Gateway goes one step further by combining XOT–X.25 de-encapsulation and X.25-TCP conversion internally, eliminating the X.25 physical interface and associated overhead or bottleneck.

Custom Enhancements

Please contact Microtronix sales with your custom design requirements.