User Manual

UBS Macro B T S FRU R eplacement Preview Chapter 1: Ov erview
UBS Macro BTS FRU Replacement Preview
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Passive and DC operation
Some FRUs are passive and do not have a DC input power source. Some FRUs are hot
swappable and can be removed/replaced with DC input power applied. Some FRUs require
shutdown of DC input power before FRU removal/replacement.
FRU backup
Some FRUs have a backup with fully -automatic switchover upon removal/replacement of the
primary .
Service affecting FRUs
FRUs that are service affecting require shutting down signaling to the entire BTS site before the
failed FRU can be removed/replaced.
Shutdown and restore signaling
The site shutdown and restore signaling procedure is performed by the OMC operator when
replacing certain FRUs.
Site shutdown signaling consists of the following sequence:
• Setup and turn ON Global Service Redirect Message to redirect all subscriber traffic
away from the site
• Disable or lock BTS
Site restore signaling consists of the following sequence:
• Enable or unlock BTS
• Reset and turn OFF Global Service Redirect Message
Testing/reoptimization
Some FRUs must be tested and if needed calibrated. Calibration requires that the BTS
site be shutdown/out -of -service or as an alternative In -Service Calibration procedure can be
used. The In -Service Calibration procedure does not require site outage. In some cases,
testing/reoptimization must be performed as part of the FRU replacement procedure. In other
cases, testing/reoptimization can be performed at the next maintenance window .
1 -10 68P09283A64 -3
FOA SEP 2007