Lucent Technologies Release 6 manual Digital Out-of-Building Voice Terminals

DEFINITY Enterprise Communications Server Release 6	Issue 5
Installation and Test for Multi-Carrier Cabinets 555-230-112	May 1998
5 Install and Wire Telephones and Other Equipment
Off-Premises or Out-of-Building Stations	Page 5-34

Protector Ordering Information

Description	Comcode
3B1A (Carbon Block)	102381779
3B1E-W (Wide Gap Gas Tube)	104410147
3C1S (Solid State)	105514756
4B1C (Carbon Block with Heat Coil)	102904893
4B1E-W (Wide Gap Gas Tube w/Heat Coil)	104401856
4C1S (Solid State with Heat Coil)	104386545
SCP-110 Sneak Current Protector	406948976
220029 Fuse (sneak current protector)	407216316

Digital Out-of-Building Voice Terminals

Protection is required at both building entrances for digital out-of-building voice terminals. There are 2 different types of protectors that can be used to protect digital voice terminals and digital line circuit packs in an out-of-building environment. The 2 enhanced protectors to use are the 4C3S-75 and the ITW Linx. These units provide primary and sneak current protection. For sneak current protection, the 4C3S-75 is equipped with a heat coil and the ITW Linx is equipped with replaceable fuses.

The 4C3S-75 may only be used with Vintage 14 or newer TN754 circuit packs. The 4C3S-75 can be used on all vintages of the TN754B circuit packs. The ITW Linx may be used on all vintages of the TN754 and TN754B circuit packs. Table 5-12 lists the approved protectors.

Table 5-12. Digital Voice Circuit Protectors

	Enhanced Primary Protector
Circuit Pack	(With Sneak Current Protection)
TN754 V13 or earlier	ITW Linx Only
TN754 V14 or later	4C3S-75 or ITW Linx
TN754B all vintages	4C3S-75 or ITW Linx
TN2181 all vintages	4C3S-75 or ITW Linx
TN2224 all vintages	4C3S-75 or ITW Linx