AXIS 570/670 User’s Manual Appendix B: SNA Gateways 217IBM MainframeAppendix B SNA GatewaysGatewayConfiguration, 3174CU modeSome hints specific to SNA gateways are given below.• AXIS 570/670 appears to a gateway as a Down Stream PhysicalUnit (DSPU), with eight LUs, 1 to 8 (LU 1 may not be available).• Only gateways that communicate with DSPUs using SNA overLLC type 2 are supported.• There are basically two types of gateways that the AXIS 570/670can be attached to: pass-through gateways and concentratorgateways, as described below.Pass-through gateway Devices attached downstream to this type of gateway are completelyvisible to the host. In other words, each DSPU will have a PUdefinition on the host. Examples of pass-through gateways are IBM3745 Communications Controller, IBM 3174 EstablishmentController, IBM 3172 LAN Interconnect Controller, etc.You need to set up at least one PU and LU definition for each AXIS570/670 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 MACaddress in the gateway.Concentratorgateway, generalA concentrator gateway typically behaves as a PU (or a few PUs) to thehost, even though a number of PUs may be available downstream. If itis an SDLC or channel attached gateway, typically only one SDLC orsub-channel address will be used. Examples of concentrator gatewaysare: IBM Communications Manager/2 (OS/2), Novell NetWare forSAA (NetWare 3.x), Microsoft SNA Server (Windows NT), etc.When an AXIS 570/670 is attached to this type of gateway, you canmap 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.
