ACC Installation and Configuration Guide

Chapter 1 31
ACC Overview
High Availability Features
Dual Interface Configuration
The Dual Interface options for ACC Mux cards provide the ability to
connect two Mux cards to the network in a high-availability
configuration. Such connections should be used to give one Mux card
access (but ONLY one), while the other remains in a hot-standby mode.
In the case that the “live” Mux card fails, the other card can be activated
with little or no interruption of service. It is possible to allow one
8-channel system access to some of t he Mux ports on the panel, and the
second system access to the remaining ports.
This feature requires t hat initially the standby card configures t he port
for “loopback”, while the “live” card configures the port for “RS-232”,
“RS-449”, etc. It also may require the use of the watch daemon.
Refer to Chapter 4 , “Dual Interface Configurations,” for more
information on using the Dual Interface configurations.
Refer t o the ACC Utilities Reference Guide for more information on the
watch daemon, and related configuration information.