Product Info

Preparations for maintenance
DN9913495 © Nokia Corporation Draft 15 (52)
Issue 3-0 en Nokia Proprietary and Confidential
Note
2.5 Removing the BTS cover
Before removing the cover for internal maintenance of the BTS, refer to the
power supply precautions and environmental restrictions presented in this
document and to the safety precautions presented in Nokia MetroSite EDGE Base
Station: Warnings and Cautions.
Removing the cover issues an alarm to the BSC. Make sure that the BSC/NMS
personnel is notified before removing the cover.
Removing the BTS cover
1. Unlock the cabinet lock at the bottom of the BTS.
Table 1. Power supply rules during maintenance procedures
Procedure Power supply rule
Replacing a power supply unit or PSU
cable
Power OFF at main disconnect device
PSU switch to Stand-by
Replacing a grounding connection Power OFF at main disconnect device
PSU switch to Stand-by
Disconnecting or connecting antenna or
diversity cables on a TRX
PSU can be switched to ON but TRX
must be blocked
Replacing a TRX PSU can be switched to ON but TRX
must be blocked
Disconnecting or connecting
transmission cables
PSU can be switched to ON but TRX
must be blocked
Replacing a transmission unit PSU switch to Stand-by
Connecting or disconnecting cables to
the interface unit (VIFA)
PSU switch to Stand-by is advised
Replacing an interface unit PSU switch to Stand-by
Replacing a fan unit Power OFF at main disconnect device
PSU switch to Stand-by