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Installing and Cabling the Cabinets
136 Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
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 Table 4: Comcodes for CMC1
on page 31 for circuit protector ordering
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
lists the approved protectors.
Note:
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.
Table 23: Analog Line Circuit Protectors
Protectors
Primary
1
1. The 3-type protectors should only be used if they are already part of the
existing protectif on system. A sneak current protector is always required
when a 3-type primary protector is used.
Primary
(with heat coil)
Sneak Current
Protectors
1
3B1A (carbon) 4B1C (carbon) 220029 Fuse
3B1E-W (wide gap
gas tube)
4B1E-W (wide gap gas
tube)
SCP-1
3C1S (solid state) 4C1S (solid state)