Cisco Cisco Prisma II EDR Receiver Installation Guide

2-14 

Installation 

78-713378-01 Rev C 

The Prisma II Reverse Receiver ships from the factory configured as a "Master".  LCI, 

TNCS, or the ICIM can be used to reconfigure the module as a “Slave.”  The Prisma 

II Chassis allows for local hard-wired redundancy by using the ALARM IN and 

ALARM OUT connectors located on the chassis.  You can configure a pair of 

modules so that if the master fails, the slave will take over. 

Notes: 
• 

The ALARM RELAYS are shown in their NORMAL (non-alarmed) state. 

When a CRITICAL FAULT occurs, the relay changes to the open state. 

• 

Then ENABLE CONTROL is shown in its OFF position.  LCI, TNCS, or the 

ICIM can be used to change its position. 

For ALARMS IN/OUT pin connector reference, see Alarm I/O and Master/Slave 

Chassis Connections in Chapter 2 of Prisma II Chassis Installation and Operation Guide, 

part number 713375. 
 
 

SLAVE MODULE

MASTER MODULE

ENABLE

CONTROL

ALARM

RELAY

ALARM

RELAY

MASTER/

SLAVE

CONTROL

MASTER/

SLAVE

CONTROL

M

S

M

S

To make a module a MASTER, set the

Master/Slave control to "Master" (the default).

The state of the slave input is ignored.

To make a module a SLAVE, set the

Master/Slave control to "Slave". The slave

w ill not turn on unless the master module

is removed or has a critical fault.

NORMAL

CRITICAL FAULT

CRITICAL FAULT

NORMAL

Inter-module connections are made on

the back of the chassis using

"ALARMS IN" and "ALARMS OUT"

connectors.

ENABLE

CONTROL

A high

enables the

module

(turns on the

receiver)

A high

enables the

module (e.g.

turns on the
transmitter)

OFF

ON

OFF

ON

Part of
ALARMS IN
connector

Part of

ALARMS IN

connector

Part of
ALARMS OUT
connector

Part of

ALARMS OUT

connector