Appendix Bsna Gateways - Axis 570 User Manual

AXIS 570/670 User's Manual
Appendix B SNA Gateways
Gateway
Configuration, 3174
CU mode
Pass-through gateway
Concentrator
gateway, general
Some hints specific to SNA gateways are given below.
• AXIS 570/670 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 570/670
can be attached to: pass-through gateways and concentrator
gateways, as described below.
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
570/670 on the host, as described in the VTAM section.
When attaching an AXIS 570/670 to a remote pass-through gateway,
you need to set the mapping of SDLC or sub-channel address to MAC
address in the gateway.
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 570/670 is attached to this type of gateway, you can
map the chosen AXIS 570/670 LU to any host LU you like. This way,
several print servers may be accessed through the same gateway.
Pooling of LUs may not be used for AXIS 570/670.
Appendix B: SNA Gateways
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