Avaya CMC1 사용자 설명서

Install Off-Premises Station Wiring

Issue 10 June 2005

135

Figure 63: Connections to 24 Out-of-Building Telephones

Circuit Protectors

Carbon block, or equivalent protection is required at both building entrances. Also sneak current
protection is required. Protection can be provided by a 4-type protector or a 3-type protector
plus a separate sneak current protector. The 4-type protector is equipped with a heat coil.

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. Connectorized multi-pair protector units (female 25-pair
connector) are recommended.

Table 23

shows the recommended protectors.

Figure notes:

1. Locally engineered cables
2. Multi-pair protector units (primary

protectors with heat coils or equivalent
with sneak current protection)

3. B25A cable
4. Concentrator cable (WP90929 List 1)
5. 356A adapter
6. Out-of-building wiring

7. Out-of-building analog telephones
8. Part of MDF
9. Station side (white field)

10. System side (purple field)

11. Cross-connect jumpers

12. To TN2183, TN769, or TN746B

analog line circuit pack

crdf24o RPY 012398