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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Exposed Port Protection
3-3Recommended Protectors and IROB Protection
3
Recommended Protectors and IROB
Protection
Table 3-1 shows the recommended protectors for the DEFINITY G1, G2, and G3,
DEFINITY ECS, System 75, and System 85. Table 3-2 shows the in-range, out-of-
building (IROB) protection for DEFINITY line circuits and terminals.
!
CAUTION:
The following circuit pack and terminal arrangements are not allowed to be
installed in an exposed environment:
1. 7300 Series connected to the TN762B or ANN17 Circuit Pack
2. MET terminals connected to the TN735 Circuit Pack
3. Analog terminals connected to the TN746 Circuit Pack
Table 3-1. Recommended Protectors
Primary
Primary
(with Heat Coil) Enhanced Primary Secondary
3B1A
(carbon)
4B1C
(carbon)
4C3S-75
(solid state)
79A Fuse
3B1E-W
(wide-gap gas tube)
4B1E-W
(wide-gap gas tube)
ITW Linx
(gas tube avalanche
suppress)
SCP-1
3C1S
(solid state)
4C1S
(solid state)