159
Installing and Wiring Telephones
October 2002
Connections to 24 Out-of-Building Telephones
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.
Figure notes
1 Locally Engineered Cables and
Equipment
2 25-Pair Connector
3 Multi-Pair Protector Units (Primary
Protectors with Heat Coils or
Equivalent with Sneak Current
Protection)
4 B25A Cable (Male to Female)
5 Concentrator Cable (WP90929 List 1)
6 356A Adapter
7 Out-of-Building Wiring
8 Out-Of-Building Analog Telephones
9 Part of Main Distribution Frame
(MDF)
10 Station Side
11 Media Gateway Side
12 White Field
13 Purple Field
14 Cross-Connect Jumpers
15 Tip and Ring Wires
crdf24o CJL 101396
8
7
1
9
10 11
12 13
14
15
16
2 2
4
4
4
4
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