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Installing and wiring telephones and trunks
94 Installing and Connecting the MDF and Telephones
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.
Table 15: Analog line circuit protectors
shows the recommended protectors.
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:
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.
Table 15: Analog line circuit protectors
Primary
*
*. 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.
Primary
(with heat coil)
Sneak current
protectors*
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)