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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Exposed Port Protection
3-4Recommended Protectors and IROB Protection
3
* Key to Abbreviations:
P = Primary; EP = Enhanced Primary
Notes:
1. Primary protection with heat coils for sneak protection are coded with the number 4 as the first
numeric. DEFINITY ports require sneak current protection for IROB terminal installations.
2. The TN754, V1 through V13 may be installed with either the DLP and primary protector or the
ITW Linx Enhanced Primary protector. These vintages may not be installed with the 4C3S-75
Enhanced Primary protector.
3. The 4C3S-75 Enhanced Protector may only be used on Vintage 14 or newer TN754 Circuit
Packs. The ITW Linx Enhanced Protector may be used on all Vintages of the TN754 Circuit
Pack.
4. The TN556 Circuit Pack requires Enhanced Primary protection at the port and Primary (3- or
4-type) protection at the terminal.
For more information on exposed port protection, refer to:
■
DEFINITY Communications System Generic 1 and Generic 3 Wiring
,
555-204-111
■
DEFINITY Communications System Generic 2 and System 85 Wiring
,
555-104-630
Table 3-2. IROB Protection
Circuit Packs Terminal Required Protector
*
SN224 7203,
7205,
MET
EP
SN228B,
SN229
2500 Series,
2500DMGC,
7100 Series
P
1
TN742,
TN746B,
TN769
500 Series,
2500 Series,
7100 Series
P
1
SN270 7400 Series EP
TN754 7400 Series (ITW)
2
TN754, V14 7400 Series EP
3
TN556 T. Term EP and P
4