User's Manual Part 2

High and Medium Stability Oscillator Module
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-7
PRELIMINARY
Introduction
The High Stability and Medium Stability Oscillator module provide a
backup reference source in the case of Global Positioning System (GPS)
failure. The HSO is capable of providing up to 24 hours, the
synchronization initially established by the GPS reference signal. The
MSO is capable of providing up to 8 hours.
There is only one HSO or MSO equipped in the Compact BTS. The
module is located in front, behind a cover, underneath the CCP2 Shelf.
The HSO or MSO slides into the top slot of the two that are present.
System Impact/Considerations
The HSO or MSO produces a 1 pulse per second (1 pps) clock output
signal to the CSA.
Front Panel Indicator
The HSO or MSO have no indicators.
Required Items
Documents
None.
Tools
None.
Replacement Units
S One HSO module (SGLA4007)
S One MSO module (SGLA4008)
Prerequisite
Coordinate this replacement with the OMC–R operator.
IMPORTANT
*
Contact the OMC–R operator before performing the replacement
procedure. Tell the operator that the HSO or MSO module will be
replaced and that alarms can be expected.
Upon completion of the replacement procedure, have the OMC–R
operator verify that old alarms are cleared and that no new ones are
reported.
9