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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Install and Wire Telephones and Other Equipment
Page 5-34Off-Premises or Out-of-Building Stations
5
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. Ta b l e
5-12 lists the approved protectors.
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
Table 5-12. Digital Voice Circuit Protectors
Circuit Pack
Enhanced Primary Protector
(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