Off-premises connections
Issue 3 January 2008 93

Figure 45: 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
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
crdf24oCJL 101396
8
7
1
9
10 11
12 13
14
15 16
2 2
4
4
4
4
6
6
5
3 3