Install and Wire Telephones
Off-Premises Connections
SI Installation and Upgrades
529
June 2004
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.
Analog Line Circuit Protectors
on page 529 shows the recommended protectors.
The protectors can be ordered from the Premises Distribution Systems Equipment and Supplies Catalog.
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Voice Terminal Restrictions for Exposed Environments
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The following voice terminals cannot be installed in an exposed environment:
•
7300-type voice terminals connected to TN762B Hybrid Line circuit packs
•
Multi-button Electronic Telephone (MET) sets connected to TN735 Multi-button Electronic
Telephone (MET) Line circuit packs
•
Analog telephones connected to TN746B Analog Line circuit packs
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Digital Out-of-Building Voice Terminal Protection
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For information about specific protectors, see
Installing the ITW Linx Enhanced Protector
on page 530
Installing the 4C3S-75 Enhanced Protector
on page 530
Installing the Data Link Protector
on page 530
Analog Line Circuit Protectors
Primary
1
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.
Primary
(with heat coil)
Sneak Current
Protectors
1
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)
