Protocol eXchange Server
What Is It?
What Does It Do?
What Does It Include?
PXS for Current Users
PXS for Developers
Hardware Specs
Software
RedBoot Loader
LayGO® Server
Solutions
Telecom Switches
X.25 over TCP/IP
SNA
Other Applications
MAC Bridge
TCP/IP over X.25
X.25 over FR
Bi and Monosync
Other
Data Line Monitor
Related Documents
Protocol eXchange Server
PXS User's Guide
Telecom User's Guide
X.25 over TCP/IP (XOT) RFC 1613 Cisco-Cisco
X.25 PSDN replaced by TCP/IP network using Cisco XOT routers
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XOT (X.25 Over TCP/IP) RFC 1613 is a solution where all ends use X.25 equipment and the Inter/Intranet replaces an X.25 Packet Switching Data Network (PSDN) or point-to-point X.25 leased line connections. PSDNs are more expensive, slower, often charge for traffic and number of virtual circuits, and for that reason are fast disappearing. Most companies using PSDNs are already using alternative Inter- or intranet or WAN TCP/IP connections. Cisco, the major supporter of RFC 1613, addressed the need of tunneling X.25 data through a TCP/IP connection without making changes to the existing X.25 connections. Cisco routers terminate all end-points by connecting their X.25 port to the customer X.25 equipment. |
Under RFC 1613, X.25 packet level data are encapsulated into a TCP/IP stream. The second 2 bytes of a 4-byte header define the size of a following packet. There is no LAPB layer traffic, and there is no LCN0 traffic. SVCs are established via Call Request/Call Accepted packets, facilities for packet and window size are mandatory. Each VC uses one TCP/IP connection.
