Chapter 8 Configuring; Configuring X.25; Introduction - Cabletron Systems Netlink FRX4000 User Manual

Introduction

An FRX4000/6000 X.25 port can connect to an X.25 DTE or an X.25 network. This
allows the node to transmit X.25 traffic, as well as IP and IPX (encapsulated per RFC
1356), and SNA (per QLLC).
X.25 support includes:
Full compliance with CCITT Recommendation X.25
Line speeds up to 2.048 Mbps
Full X.121 addressing capability
Address translation
RFC 1356 for IP over X.25
RFC 1490 encapsulation (HDLC)
A T1 X.25 port can contain up to 24 channels, and an E1 port can contain
up to 30 channels.
The FRX4000/6000 also supports logical X.25 ports, which allow multiple legacy
protocols (SDLC, async, bisync, etc.) to be encapsulated via X.25 and transmitted
over a single physical frame relay port. An FRX4000/6000 can contain up to 56
logical ports, all on one physical port or spread over several physical ports.
Some things to know about logical ports are:
Encapsulation can be via either T1.617 Annex G or T1.617 RFC1490. You
should know the pros and cons of using each. The explanation of
Method" on page 8-17 offers some help.
Both level-2 and level-3 windows can be configured. (Configuration and oper-
ation is the same for either encapsulation method.)
Chapter 8

Configuring X.25

"Encapsulation