ACC Utilities Reference Guide

224 Chapter11

WATCH - Mux Shutdown Feature

Overview

The Dual Interface Configurations allow two ACC interface cards to be

connected to a one mux panel/cable. In order for the interface ports to be

accessed, they must be configured as LOOPBACK from one interface

card, and as RS232, X.21 (or whatever is appropriate) from the other

interface card.

In order to pass control of a given interface port from one mux card to the

other, all of the activity on the given port must be terminated, the port

must then be put into LOOPBACK mode by the interface card that is

relinquishing control and into the appropriate (RS232, X.21, etc.) mode

by the interface card th at is tak ing over control.

In the case that the system that is currently controlling the mux panel or

cable panics, there must be a way for the distressed system to relinquish

control of the panel/cable. This is done by using the watch daemon and

by using the MONITOR protocol module. The watch daemon sends

heartbeats to the MONITOR protocol module. In the case that the

protocol module on the card no longer receives a heartbeat from the

daemon, it halts the card and places all ports into tri-state (loopback)

mode.

It is suggested t hat the watch featurealwaysbeusedwhendual

interface configurations are used.

The watch da emon logs i ts messages to the ZCOM message log. Refer to

the ACC Error Guide foritserrormessages.