Avaya 6424D+M User Manual page 63

3-6
ELECTRICAL PROTECTION: SYSTEM 85 AND DEFINITY GENERIC 2 WITH TRADITIONAL MODULES
Enhanced Primary Protectors
The following are enhanced primary protector units supplied by AT&T, Illinois Tool Works (ITW), and
Porta Systems:
AT&T 4C3S-75 (comcode 105581086; PEC 65543 and 65543A) — a semiconductor device and
heat-coil protector unit that offers precise clamping, superior balanced performance, fail safe
operation and no deterioration with age or number of operations. This module is used to protect:
— Multibutton electronic telephones (METs)
— SN224B (hybrid) circuit packs
— 7200 series (hybrid) terminals
— SN270B (digital) circuit packs
— 7400 series (digital) terminals
Digital terminals protected by the 4C3S-75 do not require local power if the terminals have no
adjuncts attached. The terminals require local power if adjuncts are attached.
The 4C3S-75 is the best and preferred device for protecting hybrid and digital terminals and ports in
System 85 and DEFINITY Generic 2 with traditional modules. The 4C3S-75 is less expensive than
the module protectors offered by outside vendors.
NOTE: Do not use the 4C3S-75 with analog ports and terminals.
ITW Linx LP2-100-068 (comcode 405077355; PEC 65541 and 65541A) — an avalanche-diode,
gas-tube, sneak-current fuse, protector unit. This protector unit has the same loop range for
terminals as a PDP protector (see table 3-1, Loop Ranges for Protected Hybrid Terminals, and table
3-2, Loop Ranges for Protected Digital Terminals) and is recommended for the protection of small
numbers of cabling pairs (up to 50 pairs). Although this protector may be used, it does not mount
on the standard 5-pin protector block. The separate ground connection requirement of this protector
requires more time to install and replace, increasing the chance of improper or faulty connections. It
mounts on the 66 cross-connect system and can be used to protect:
MET sets
—
— SN224B (hybrid) circuit packs
— 7200 series (hybrid) terminals
— SN270B (digital) circuit packs
— 7400 series (digital) terminals
Linx cannot be used for analog circuit packs and terminals.
Porta Systems Corp., Delta Protector (comcode 405077371; PEC 65540) — a gas-tube, avalanche-
diode, heat-coil module. See table 3-1, Loop Ranges for Protected Hybrid Terminals, and table 3-2,
Loop Ranges for Protected Digital Terminals. . The PDP recommended for the protection of more
than 50 cabling pairs. It plugs into the 188-90 protector panel and to protect:
— MET sets
— SN224B (hybrid) circuit packs
— 7200 series (hybrid) terminals