User`s guide

AXIS 5470e/570/670e User’s Manual Appendix B: SNA Gateways
241
Appendix B SNA Gateways
Gateway
Configuration,
3174 CU mode
Some hints specific to SNA gateways are given below.
• AXIS 5470e/570/670e appears to a gateway as a Down Stream
Physical Unit (DSPU), with eight LUs, 1 to 8 (LU 1 may not be
available).
• Only gateways that communicate with DSPUs using SNA over
LLC type 2 are supported.
• There are basically two types of gateways that the AXIS
5470e/570/670e can be attached to: pass-through gateways and
concentrator gateways, as described below.
Pass-through gateway Devices attached downstream to this type of gateway are completely
visible to the host. In other words, each DSPU will have a PU
definition on the host. Examples of pass-through gateways are IBM
3745 Communications Controller, IBM 3174 Establishment
Controller, IBM 3172 LAN Interconnect Controller, etc.
You need to set up at least one PU and LU definition for each AXIS
5470e/570/670e on the host, as described in the VTAM section.
When attaching an AXIS 5470e/570/670e to a remote pass-through
gateway, you need to set the mapping of SDLC or sub-channel address
to MAC address in the gateway.
Concentrator
gateway, general
A concentrator gateway typically behaves as a PU (or a few PUs) to the
host, even though a number of PUs may be available downstream. If it
is an SDLC or channel attached gateway, typically only one SDLC or
sub-channel address will be used. Examples of concentrator gateways
are: IBM Communications Manager/2 (OS/2), Novell NetWare for
SAA (NetWare 3.x), Microsoft SNA Server (Windows NT), etc.
When an AXIS 5470e/570/670e is attached to this type of gateway,
you can map the chosen AXIS 5470e/570/670e LU to any host LU
you like. This way, several print servers may be accessed through the
same gateway.