Ref: 99980064
Title: Bridge SNA Product Line
Date: 6/1/86

Copyright 3Com Corporation, 1991.  All rights reserved.

Bridge offers a family of SNA products to provide communication
between asynchronous terminals or PCs and IBM mainframe
computers.  These servers also provide connection of IBM 3270
display terminals and SNA environments when used in conjunction
with the new CS/1-3270.  In addition, bisynchronous and
bitsynchronous pass-through products can support connectivity in
IBM Bisynchronous environments as well as with Bisynchronous
protocols from other vendors.

.h1;Communications Server/1-SNA

Overview

The CS/1-SNA is a high-performance, 68000-based Communications
Server that provides an interface to an IBM SNA environment.  It
allows asynchronous ASCII terminals connected to a Bridge
terminal server (CS/1, LS/1, CS/100, or CS/200 product) to access
an IBM mainframe.  In addition, an IBM PC or compatible directly
connected to Ethernet via 3Com's EtherLink card running EtherTerm
may also connect to a CS/1-SNA port and receive similar services.
An IBM3270 display may also access an IBM mainframe via the CS/1-
3270 and a CS/1-SNA.  To the IBM host, the CS/1-SNA looks like an
SNA3274 Model 51C Control Unit.

ASCII terminals connected to multiple Communications Server
products in a multivendor, multiple host environment may connect
to either ASCII or IBM hosts.  All services normally available in
the Bridge LAN environment may be used in conjunction with the CS/
1-SNA.  Sessions with multiple hosts may be established
simultaneously using the Bridge User Interface.  Terminals may
switch between a session on a non-IBM host and a session on an
IBM host or between different IBM host applications communicating
through different LU sessions.

Features

*   Full set of protocol conversion and 3270 terminal emulation
services, which allow ASCII terminals to access application
programs and data stored on an SNA network.

*   Provides IBM access for 3278 terminals connected to Bridge CS/
1-3270 servers.

*   Support for 24 ASCII printers or terminals.

*   Full 3278 Model 1, 2, and 5 screen emulation including 27-
line screen and function key mapping.

*   Up to 15 terminal emulations.

*   Hybrid asynchronous/IBM 3270 environment on a single local
area network.

*   SNA Physical Unit Type 2 (PU.T2) node emulation.

*   Support for SNA Logical Unit (LU) Types 1, 2, and 3.

*   Support for leased, switched, or direct-connect SDLC lines to
the 3705/3725 front-end at speeds up to 64K bps.

*   Network performance and CS/1-SNA utilization information
provided over the network.

*   Support for the following host application environments:

    -   Time Sharing Option (TSO)
    -   Virtual Storage Personal Computing (VSPC)
    -   Customer Information Control System (CICS)
    -   Information Management System/Data Communications (IMS/
        DC)

.h1;Communications Server/1-TCP-SNA

Overview

The CS/1-TCP-SNA is a TCP-to-SNA Gateway Server that supports one
synchronous SDLC port to an IBM communications controller with a
maximum of 24 LU-to-LU sessions.  It provides a connection
service between a wide variety of non-IBM terminals, IBM 3270
terminals, workstations, and an IBM host running SNA.  Because it
runs the DoD TCP/IP protocols, this service is accessible over
the Ethernet by a terminal, a PC on a Bridge Communications
Server with service is accessible over the Ethernet by a
terminal, a PC on a Bridge Communications Server with TCP/IP, an
IBM 3270 terminal attached to the CS/1-3270 running TC/IP, and by
a number of different workstations or host computers running the
TCP/IP (including Telnet) protocols.

SW/1-T-SNA3270 is the software that runs on the CS/1-TCP-SNA.
The CS/1-TCP-SNA has the same hardware architecture as the CS/1-
SNA described in the previous section.

Features

*   Full protocol conversion along with 3270 emulation.

*   A variety of terminal emulations.

*   Support for the SCS (String Character Stream) printer (LU
type 1), 3278 Model 1, 2, and 5 terminals (LU type 2), DSC
(Data Stream Compatible) 3270 printers (LU type 3), and 3287-
compatible printers.

*   Any asynchronous terminal or PC connected via Bridge
Communications Servers can connect to an IBM SNA host.

*   UNIX-based workstations that support TCP/IP protocols and
that are directly connected to Ethernet can connect to an IBM
host.

*   Support for IBM host access for IBM PCs running Bridge's
TCPTerm and connected directly to Ethernet via an EtherLink
controller.

*   Network Management Services such as usage statistics,
Ethernet, and server performance statistics.

*   Support for the following host application environments:

    -   Time Sharing Option (TSO)
    -   Virtual Storage Personal Computing (VSPC)
    -   Customer Information Control System (CICS)
    -   Information Management System/Data Communications (IMS/
        DC)

*   In addition to TCP and IP, the following related protocols
are implemented:

    -   User Datagram Protocol (UDP)
    -   Address Resolution Protocol (ARP)
    -   Internet Name Server Protocol (Name Server)
    -   Server Telnet









