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

160
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 160
The protectors can be ordered from the Premises Distribution Systems Equipment and Supplies
Catalog.
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.
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 161
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.
October 2002
shows the recommended protectors.
Sneak Current
1
Protectors
220029 Fuse
SCP-1
''Analog
''Digital Voice Circuit