Off-Premises Protection Requirements; Telephone Restrictions For Exposed Environments; Digital Out-Of-Building Telephone Protection - Avaya G650 Installing

Off-premises protection requirements

Both building entrances require carbon block or equivalent protection and sneak current protection.
Protection can be provided by:
•
a 4-type protector, which is equipped with a heat coil
•
a 3-type protector plus a separate sneak current protector
The 4-type protector is the preferred device. For installations not using primary protection, 4-type
protectors should always be used. When the 3-type protector is already installed, a separate sneak current
protector is required.
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.
protectors, on page 177 shows the recommended protectors.
Table 29: Analog line circuit protectors
*
Primary
3B1A (carbon)
3B1E-W
(wide gap gas tube)
3C1S
(solid state)
* 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 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.
Installing the Avaya G650 Media Gateway
June 2004
Primary
(with heat coil)
4B1C (carbon)
4B1E-W
(wide gap gas tube)
4C1S
(solid state)
Installing and wiring telephones and trunks
Table 29, Analog line circuit
Sneak current
*
protectors
220029 Fuse
SCP-1
177