Product Info

Field Upgrade
14 (50) © Nokia Corporation Draft DN00187365
Nokia Proprietary and Confidential Issue 2-0 en
2.2 Checking warnings and cautions
The warnings and cautions applicable to the MetroSite BTSs are detailed in Nokia
MetroSite EDGE Base Station: Warnings and Cautions. Read these before
beginning a field upgrade.
Table 1. Power supply rules during BTS upgrade or maintenance
procedures
BTS upgrade or maintenance
procedure
Power supply rule for BTS
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 ON but TRX must
be blocked
Disconnecting or connecting
transmission cables
PSU can be switched 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
Connecting cables to the interface unit
for BTS chaining
PSU switch to Stand-by
Replacing an interface unit PSU switch to Stand-by
Replacing a fan unit • Power OFF at main disconnect
device
• PSU switch to Stand-by