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EXPOSED PORT PROTECTION
TABLE 2-D. IROB Protection
CIRCUIT REQUIRED SEE
PACKS
TERMINAL
PROTECTOR* NOTE
SN224 7203, EP —
7205,
MET
SN228B, 2500 Series, P 1
SN229 2500DMGC,
7100 Series
TN742, 500 Series, P 1
TN746B, 2500 Series,
TN769 7100 Series
SN270 7400 Series EP —
TN754 7400 Series (ITW) 2
TN754, V14 7400 Series EP 3
TN556 T. Term EP & P 4
*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 Vin-
tages 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
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