Polycom DOC2238A manual MPI-4/8 Network Interface Module front panel

Chapter 4 - Hardware Description

The MPI-4/8 Network Interface Module

MPI is an acronym for the Multi Protocol Interface card. The MPI-8 is a serial communications interface card that uses certain protocols to communicate to endpoints, “Data Terminal Equipment” (DTE), or “Data Communications Equipment” (DCE). The protocols that it uses are RS-449, RS-530, V.35, and RS-366, which is a dialing protocol.

The MPI-4/8 Network Interface Module is connected to the DCE (supplied by the customer) via the MPI box. The front panel of the MPI-4/8 network interface contains two 160-pin connectors.

MPI-8

Connection to the

A 160-pin connector on the front panel of the MPI box

Connection to the 160-pin connector on

B the front panel of the MPI box

Figure 4-14: MPI-4/8 Network Interface Module front panel

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