51402573-150 is the modem interface between the HPM and UCN cable. In the PM and APM this required an IOP slot in the PM/APM chassis. This HPM UCN interface module (51402573-150) plugs into the 50 pin cable socket for slot 1 directly below the HPM Comm/Ctrl module. The 2 UCN cables connect to the front of this module.

The HPMM assemblies occupy the two left-most slot positions in the card file. The HPM UCN Interface module mounts in the connector beneath the High-Performance Comm/Control card in the first slot.

The HPMM card set consists of following assemblies:

• High-Performance Comm/Control card 51403988-150
• High-Performance I/O Link card 51309276-150
• HPM UCN Interface module Conformal Coated 51402573-250