3Com S26x, S27x, S24x installation manual TI Dual Port Digital PBX Interface Card, Function

	Hardware Components
TI Dual Port Digital PBX Interface Card
Introduction
	The T1 dual port digital PBX interface card supports digital voice communications,
	providing integrated network access. The T1 interface card is installed primarily in
	North America and Japan. A 2-megabyte T1 card is required for passing data and
	voice traffic.

109 8 7 6 5 4 3 2 1 N O

SW1 DIP Switch Bank

MVIP Bus Interface Connector

ISA Bus Interface

Port 49 LED Port 50 LED

Run LED SysFail LED

Port 49 Interface

Port 50 Interface

Serial Diagnostic Port (Not Supported)

Pin 8

Pin 1

	Figure 1-11. T1 Dual Port Digital PBX Interface Card
Description
	Each T1 dual port digital PBX interface card uses an Industry Standard Architecture
	(ISA) bus interface and a Multi-Vendor Integration Protocol (MVIP) bus interface.
	The MVIP bus interface provides multiplexed digital access within the PathBuilder
	S24x, 26x, and 27x switch chassis.
Function
	T1 dual port digital PBX interface cards provide the digital interfaces for
	connections to a PBX. The T1 dual port digital PBX interface cards bring PCM voice
	and channel signaling into the node. The PCM voice data and voice signaling is
	routed to a DSPM/SM card over the MVIP bus for compression and transmission to
	the remote end.

About the PathBuilder S24x, 26x, and 27x switch 1-17