Removing The Bts Cover; Table 1. Power Supply Rules During Maintenance Procedures - Nokia MetroSite Maintenance Manual

Table 1.
Procedure
Replacing a power supply unit or PSU
cable
Replacing a grounding connection
Disconnecting or connecting antenna or
diversity cables on a TRX
Replacing a TRX
Disconnecting or connecting
transmission cables
Replacing a transmission unit
Connecting or disconnecting cables to
the interface unit (VIFA)
Replacing an interface unit
Replacing a fan unit
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.
Note
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.
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Power supply rules during maintenance procedures
Unlock the cabinet lock at the bottom of the BTS.
Preparations for maintenance
Power supply rule
Power OFF at main disconnect device
PSU switch to Stand-by
Power OFF at main disconnect device
PSU switch to Stand-by
PSU can be switched to ON but TRX
must be blocked
PSU can be switched to ON but TRX
must be blocked
PSU can be switched to ON but TRX
must be blocked
PSU switch to Stand-by
PSU switch to Stand-by is advised
PSU switch to Stand-by
Power OFF at main disconnect device
PSU switch to Stand-by
Draft
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