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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Exposed Port Protection
3-2Out-of-Building Campus Stations
3
Protection is required at both entrances for digital out-of-building voice terminals.
There are two 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
4C3S-75 Enhanced Protector and the ITW Linx Enhanced Protector.
NOTE:
The 4C3S-75 Enhanced Protector may only be used on Vintage 14 or newer
TN754 Circuit Packs. The 4C3S-75 can be used on all vintages of the
TN754B Circuit Pack. The ITW Linx Enhanced Protector may be used on all
Vintages of the TN754 and TN754B Circuit Packs.
The 4C3S-75 Enhanced Protector is equipped with a heat coil for sneak current
protection and the ITW Linx Enhanced Protector is equipped with replaceable
fuses for sneak current protection.
The maximum range for out-of-building voice terminals is 3,400 feet when using
24 AWG wire and 2,200 feet when using 26 AWG wire. The range can be
extended to 5,000 feet (24 AWG) or 4,000 feet (26 AWG) with the use of a Data
Link Protector (DLP). The DLP is an isolating transformer used to remove
phantom power on the switch side and reintroduce it on the terminal side. When a
DLP is used, the voice terminal must be locally powered by an external power
supply or through the AC power cord provided with some of the 7400 series voice
terminals. The DLP is installed on the equipment side of the protection in both
buildings. In high lightning areas, the DLP may also be installed to provide the
maximum degree of protection and reliability.