Telephone Restrictions For Exposed Environments; Digital Out-Of-Building Telephone Protection - Avaya S8700 Installing

240 Installing the Avaya™ S8700 Media Server with Avaya™ MCC1 or SCC1 Media Gateway
Installing and Wiring Telephones
The multi-pair protector units and the off-premises cabling must be locally engineered.
Connected multi-pair protector units (female 25-pair connector) are recommended.
Line Circuit Protectors'' on page 240
Analog Line Circuit Protectors
Primary
3B1A (carbon)
3B1E-W
(wide gap gas tube)
3C1S
(solid state)
1. The 3-type protectors should be used only 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.
For catalogs and ordering information go to the Avaya Cable Management Systems for Service
Providers Web site (http://connectivity.avaya.com/exchangemax/) and click on Products &
Solutions.
Telephone Restrictions for Exposed
Environments
Analog telephones connected to TN746B Analog Line circuit packs cannot be installed in an
exposed environment.

Digital Out-of-Building Telephone Protection

Digital out-of-building telephones require protection at both building entrances. The 4C3S-75
Enhanced Protector and the ITW Linx Enhanced Protector can be used to protect digital
telephones and digital line circuit packs. These units provide primary and sneak current
protection. The 4C3S-75 is equipped with a heat coil for sneak current protection, and the ITW
Linx is equipped with replaceable fuses for sneak current protection.
NOTE:
The TN2181 16-port, 2-wire digital line circuit pack may not be approved for some
out-of-building uses. Contact your Avaya representative for more information.
The 4C3S-75 may be used only with TN754B circuit packs circuit packs.
Protectors'' on page 241
When possible, all new and reused wiring installations should use blocks that accept the
standard 5-pin plug-in 4C3S-75 protector. However, there are reused wiring installations where
this may not be cost effective. For these installations, the ITW Linx protector may be installed.
Primary
1
(with heat coil)
4B1C (carbon)
4B1E-W
(wide gap gas tube)
4C1S
(solid state)
lists the approved protectors.
shows the recommended protectors.
Sneak Current
Protectors
220029 Fuse
SCP-1
May 2003
''Analog
1
''Digital Voice Circuit