Electrical Protection: Definity Generic; With Universal Modules; Recommended Protectors - Avaya 6424D+M User Manual

8. ELECTRICAL PROTECTION: DEFINITY GENERIC 2

This chapter describes the protection scheme for DEFINITY® Communications System Generic 2
(hereafter abbreviated to DEFINITY Generic 2 or Generic 2) with universal modules. Basic protection
concepts apply to both the DEFINITY Generic 2 with universal modules, System 85, and
DEFINITY Generic 2 with traditional modules.
There are some differences in the devices used to protect the Generic 2 with universal modules, as well
as differences in the types of circuit packs and terminals these devices protect. See chapter 3, Electrical
Protection: System 85 and DEFINITY Generic 2 with Traditional Modules, for basic information on
protectors and protection schemes for System 85 and DEFINITY Generic 2 with traditional modules.
For Generic 2 with universal modules, there are six primary, three enhanced primary, and one secondary
protector that can serve the needs of in-range, out-of-building (IROB) terminal installations. The
primary protectors all provide protection in the standard analog voltage range of 220V to 300V and may
include a heat coil for sneak-current protection. The 4C3S-75 enhanced primary protector is installed in
place of the primary protector and operates at 75V. The secondary protector is used in conjunction with
primary protection and is installed on the equipment (terminal or port) side of the primary protector.

RECOMMENDED PROTECTORS

Following are recommended electrical protectors that can be used for primary, enhanced primary, and
secondary applications. With the exception of the 79A sneak-current fuses, all of the following primary
and enhanced primary protector units plug into 188 panels.
Primary Protectors
There are several primary protection devices available for circuit packs, terminals, and trunk lines of
Generic 2 with universal modules.
3BlA — carbon block device
3BlE-W — wide-gap gas tube
3C1S — solid-state device
4B1C — carbonblock device that includes a heat coil, providing primary and sneak-current
protection
4B1E-W — wide-gap gas tube that includes a heat coil, providing primary and sneak-current
protection
4C1S — solid-state device that includes a heat coil, providing primary and sneak current protection

WITH UNIVERSAL MODULES

8-1