# OTMA Server

The OTMA server accepts requests from and returns results to Substation ES IMS Interface. You can make connections to one or more clients by using a server provided in the OTMA environment.

The OTMA server, located within the IMS control region, is supplied by IBM and can accept multiple connections from individual or multiple Substation ES IMS interfaces. Though easily generalized, the OTMA implementation is specific to IMS in a z/OS Sysplex environment.

The key to message flow for OTMA is the transaction pipe, the logical connection between the OTMA server and Substation ES IMS Interface. IMS uses the concept of a logical terminal (LTERM) to ensure that responses are associated with the correct requesters. OTMA does not use an LTERM but still must maintain a connection between the client and IMS. This connection is the transaction pipe, or Tpipe. See Tpipes for more information.

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