Avaya DEFINITY ONE Installation And Upgrades page 163

Installation and Upgrades for DEFINITY ONE and
IP600 Internet Protocol Release 10 555-233-109
1 Install and Cable the Cabinet
Install off-premises station wiring
Circuit protectors
Both building entrances require carbon block or equivalent protection and sneak
current protection. Provide this protection with a 4-type protector. The 4-type
protector is equipped with a heat coil or a 3-type protector plus a separate sneak
current protector.
The 4-type protector is the preferred device. For installations not using primary
protection, always use 4-type protectors. 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. Connectorized
multi-pair protector units (female 25-pair connector) are recommended.
Table 1-21
Table 1-21. Analog line circuit protectors
Primary
3B1A (carbon)
3B1E-W (wide-gap
gas tube)
3C1S (solid state)
1. The 3-type protectors should only be used 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.
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 TN762 Hybrid Line circuit packs
Multi-button Electronic Telephone (MET) sets connected to TN735 MET
Line circuit packs
Analog telephones connected to TN746 Analog Line circuit packs
See Table 1-3 on page 1-8
shows the recommended protectors.
Primary
1
(with heat coil)
4B1C (carbon)
4B1E-W (wide-gap gas tube)
4C1S (solid state)
for circuit protector ordering information (comcodes).
Issue 6
December 2001
1-123
Sneak current
1
protectors
220029 Fuse
SCP-1