Ref: 99980072
Title: Communications Server/1-Token Ring
Date: 10/1/86

Copyright 3Com Corporation, 1991.  All rights reserved.

Overview

The CS/1-TR is a modular communications server that links both
IBM and non-IBM computer equipment to a Token Ring (IEEE 802.5)
network.  The server operates as a data switch, providing virtual
circuit-based connections over the ring.

With up to four SIO boards, the CS/1-TR supports up to 64
asychronous terminals, IBM 3270 terminals, printers, modems,
personal computers, and hosts, as well as synchronous devices.
These asychronous and synchronous devices can communicate with
each other through the CS/1-TR and coexist on the same network
with other Token Ring-compatible devices.

Features

*   Fully compatible with IEEE 802.5 and 802.2 Logical Link
Control (LLC) protocol specifications and the IBM Token
Ring.  In addition, it supports the use of the IBM 8228
Multistation Access Unit (MAU) and standard IBM Cabling
System components including Type 1 or Type 9 IBM Cabling
System.

*   Operates as a distribution data switch over twisted-pair
cable.  Terminals, PCs, and peripherals can be installed or
relocated with minimal effort and expense.  Up to 260 CS/1-TR
servers can be replaced 300 meters apart on a single Type 1
cable-based ring for a total of 16,640 physical connections.

*   Network management features including the collection and
display of server and network statistics, port access
control, dynamic port configuration and storage, and macro
definition and storage.

*   Interactive user interface commands allow the use of logical
names for creating multiple sessions.  Rotaries and call
queuing features allow terminal users to contend for host
ports.  These features reduce network costs.  The port access
control feature ensures network security.  Permanent virtual
circuits, macros, and a comprehensive help facility make the
CS/1-TR easy to use.

*   Users with asynchronous and IBM 3270 terminals can switch
access to asynchronous hosts, IBM hosts, and asynchronous
peripherals over the Token Ring network.  Synchronous devices
may be interconnected across the network via a synchronous
pass-through capability.

*   Provides high performance based on a multiprocessor
architecture and the Texas Instruments TMS380 Token Ring chip
set.















