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ELECTRICAL PROTECTION: DEFINITY GENERIC 2 WITH UNIVERSAL MODULES
8-3
TABLE 8-1. Generic 2 with Universal Modules Protection Matrix
-
P r i m a r y Secondary
Circuit
Line Packs/
Circuit
Exposed
Circuits/
On-Off Prem
Term/
T r u n k
Sneak 5
Current
Protection
Required
Protector
Enhanced
Primary
6
PDP, ITW,
Notes
or 4C3S-75
DLP
1 T N 7 2 / 8 Yes/Both Anl Line Yes Yes
No NA 1
2a TN46/16
No/On Anl Line NA NA NA NA
2b TN746B/16 No/On
Anl Line NA NA NA NA
3 TN762B/8
No/On
730X- MFAT
NA NA NA
NA
4a
TN754/8
Yes/Both 7 4 0 x - D i g Yes Yes PDP or ITW Yes 2 , 8
4 b TN754B/8 Yes/Both
7 4 0 X - D i g Yes Yes Yes Y E 2
5 T N 4 7 / 8
Yes/Both CO Trk Yes Yes No NA 1
6 TN753/8 Yes/Both DID Trk Yes Yes No NA 1
7 TN760C/4 Yes/Both Tie Trk
Yes Yes No NA 3
8 TN763C/4
No/On Aux NA NA NA NA
9 TN735/4 No/On MET NA NA NA NA
10 TN555/1 Yes/Both ISDN PR1
Yes Yes NA NA
4
11
TN556/12 Yes/Both
750X-lSDN BRI Yes Yes 4 C 3 S - 7 5 NA 7
1 2 TN767/1 Ycs/Both DS1 Yes Yes NA NA
3
NOTES:
1.
2.
3.
4 .
5 .
6 .
7.
8 .
Gas tube may be substituted for carbon block to increase protection and lower maintenance cost.
If the DLP protector is provided, then primary protection is required on the network side of the facilities.
If the TL31M or channel service unit (CSU) is provided, then primary protection must be provided on the network side of the facilities. The
TN760C cannot be directly connected to exposed facilities.
The TN555 does not have tip and ring connections. It connects directly to the TN767 via a special "Y" cable.
AT&T 5-pin plug-in protector units and primary protetectors that begin with the number 4 are equipped with heat coils that provide sneak-
current protection.
Primary and sneak-current protection can be provided simultaneously by using carbon blocks (4BlC), wide-gap gas tubes (4BIE-W). or solid-
state protectors (4C1S). Primary protector with a "4" prefix are preferred but not required. 3B/3C protector series can be used after a thorough
site investigation that determines there is no need for sneak-current protection no chance of a power cross.
The 7500 ISDN-BRI (integrated services digital network-basic rate interface) requires a 4C3S-75 be placed on the switch and a carbon
block on the terminal end.
For TN754 circuit packs, the 4C3S-75 protector is only appropriate for vintage 15.
Table 8-2, Loop Ranges for Protected Terminals, lists the loop ranges and required protection devices
for the protected terminals for Generic 2 with universal modules.
TABLE 8-2. Loop Ranges for Protected Terminals
Terminal Type Protectors Range (ft)
24 AWG
26 AWG
7400 Primary & DLP 5000 4000
7500
4C3S-75 & 4B1C
1900
1600