AXIS 5570e/AXIS 5670e User’s Manual Section 14: SNA Gateways 247Section 14 SNA GatewaysGatewayConfiguration,3174 CU modeSome hints specific to SNA gateways are given below.• AXIS 5570e/AXIS 5670e appears to a gateway as a Down StreamPhysical Unit (DSPU), with eight LUs, 1 to 8 (LU 1 may not beavailable).• Only gateways that communicate with DSPUs using SNA overLLC type 2 are supported.• There are basically two types of gateways that the AXIS5570e/AXIS 5670e can be attached to: pass-through gatewaysand concentrator gateways, 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 AXIS5570e/AXIS 5670e on the host, as described in the VTAM section.When attaching an AXIS 5570e/AXIS 5670e to a remote pass-through gateway, you need to set the mapping of SDLC or sub-channel address to MAC address in the gateway.
