User`s manual

Section 3: Setting Up - SNA
58 AXIS 570/670 MIO User’s Manual
SNA
Gateway Configuration, 3270 CU mode
Some hints specific to SNA gateways are given below.
• AXIS 570/670 MIO 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
MIO 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
570/670 MIO on the host, as described in the VTAM section.
When attaching an AXIS 570/670 MIO 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 570/670 MIO is attached to this type of gateway, you
can map the chosen AXIS 570/670 MIO LU to any host LU you like.
This way, several print servers may be accessed through the same
gateway.