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8-16 LOCAL AREA NETWORK CONNECTIONS
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Type of Operating Gateway PC
LAN System Software
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StarLAN, StarGROUP LAN Manager Remote Gateway
Token Ring, or Asynchronous Gateway Server
Ethernet
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Banyan PC Dial-In
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Novell Access Server
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ISN is not listed in the above table because, unlike the StarLAN, token ring, and Ethernet LANs, ISN
provides remote terminal access through its concentrator, rather than a gateway PC.
Communication with LANs That Use the StarGROUP Operating System
AT&T offers two packages that provide access to and from LANs that use the StarGROUP operating
system: the LAN Manager Remote Gateway and the Asynchronous Gateway Server. Both packages can
reside on a 6386 PC that runs UNIX. The 6386 PC acts as a gateway and is the communications link
between the communications system and the LAN. (For more details, see the AT&T StarLAN Hardware
and StarGROUP Software Solutions Marketing Guide, 315-238.)
• LAN Manager Remote Gateway — This package allows outside users to access a LAN’s hardware and
software resources through the communications system. The package consists of two pieces of
software: the remote PC client LAN Manager software and the remote gateway software. The remote
PC client software resides on the outside PC that is seeking access to the LAN. The remote PC server
software resides on the gateway PC that is a LAN node. The gateway must be a 6386 PC on which
UNIX is running.
Recommended access to the gateway PC through the communications system is via a DCP port and a
7400A or 7400B data module (an EIA port and ADU may also be used) to the network access unit
(NAU) expansion board in the gateway PC (see figure 8-7). Calls up to 19.2 kbps from the remote PC
to the gateway are supported. Outbound calls from a LAN node are not supported.
• Asynchronous Gateway Server — This package allows LAN users to access outside resources through
the communications system. The package resides on a 6386 gateway PC on which UNIX is running.
The gateway PC must be a node in the LAN and must also be connected to the communications system.
(See figure 8-8.)
Asynchronous gateway software supports only outbound communications. The gateway can maintain
communication between LAN nodes and up to 34 outside DTEs. A LAN MS-DOS node (client PC)
accesses outside DTEs through the interaction of the terminal emulation software that runs on the client
PC and asynchronous gateway software running on the gateway PC. DOS communications provides
the client PC with services necessary to access asynchronous hosts for terminal sessions and file
transfers.
Access to/from LANs That Use Other Operating Systems
The connections necessary to access these LANs through the communications system are very similar to
those needed for access to or from a LAN operating with StarGROUP software. That is, for outside
asynchronous terminal to access to the LAN, a LAN PC must be chosen as the gateway. This gateway PC
must have access to both the LAN and the communications system. In addition, the gateway must be