Avaya CMC1 Installation Manual page 119

Table 23: Analog Line Circuit Protectors
Protectors
1
Primary
3B1A (carbon)
3B1E-W (wide gap gas
tube)
3C1S (solid state)
1 The 3-type protectors should only be used if they are already part of the existing
protection system. A sneak current protector is always required when a 3-type primary
protector is used.
The maximum range of out-of-building analog telephones (500-, 2500-, or 7100-types) connected to an
analog line circuit pack should be such that the maximum loop resistance does not exceed 1300 ohms.
The following voice terminals cannot be installed in an exposed environment:
•
7300-type voice terminals connected to TN762B Hybrid Line circuit packs
•
Analog telephones connected to TN746B Analog Line circuit packs
1
Refer to
information (comcodes).
Digital Out-of-Building Telephones
Protection is required at both building entrances for digital out-of-building voice terminals. There are 2
different types of protectors that can be used to protect digital voice terminals and digital line circuit
packs. The 2 protectors to use are the 4C3S-75 Enhanced protector and the ITW Linx Enhanced
Protector. These units provide primary and sneak current protection. The 4C3S-75 is equipped with a heat
coil for sneak current protection. The ITW Linx is equipped with replaceable fuses for sneak current
protection.
The 4C3S-75 is only used with Vintage 14 or newer TN754 circuit packs. The 4C3S-75 can be used on all
vintages of the TN754C circuit packs. The ITW Linx may be used on all vintages of the TN754 circuit
packs. Table 24
NOTE:
The TN2181 (2-Wire 16 Port Digital Line circuit pack) may not be approved for some out-
of-building uses. Contact your Avaya Inc. representative for more information.
Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
June 2004
Primary
(with heat coil)
4B1C (carbon)
4B1E-W (wide gap gas tube)
4C1S (solid state)
Table 4, Comcodes for CMC1,
lists the approved protectors.
Installing and Cabling the Cabinets
Install Off-Premises Station Wiring
Sneak
Current
1
Protectors
220029 Fuse
SCP-1
on page 26 for circuit protector ordering
119