User Manual

1X UBS Macro B T S FRU QHSO (Quartz High Stabilit y Oscillator)
QHSO (Quartz High Stability Oscillator)
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QHSO Description
The optional QHSO is located on the S SI rear panel (see Figure 1 -8 S SI rear panel details
on page 1 - 36 ).
The QHSO is an upgraded backup synchronization source for maintaining BTS system timing
established/sourced by the E -GPS or Remote GPS (RGPS) head. QHSO backup is used instead of
the internal DMI controller Motorola Stability Oscillator (MSO). The QHSO can maintain BTS
system timing for up to 24 hours, as compared to 8 hours provided by the MSO .
The QHSO contains a high stability quartz crystal oscillator .
The QHSO has a 9–pin D -connector that connects to the HSO 9 -pin connector on the S SI rear
panel. This connection allows the S SI to supply DC power to the QHSO . In addition, control/data
signals are exchanged between the DMI controller and QHSO through this connection. DC
power , control and timing information for QHSO operation is in the one connector between
the QHSO and S SI.
When the UBS Macro BTS frame is equipped with the optional Quartz High Stability Oscillator
(QHSO), the DMI controller selects the QHSO as the backup synchronization source instead of
the MSO . The QHSO can maintain system timing for up to 24 hours.
System impact/considerations
P erforming this replacement procedure should not require BTS down time or impact
call processing because BTS system timing is being sourced by E -GPS or an RGPS
head. However , QHSO down time occurs and alarms are reported.
The QHSO is backed up by the MSO on the DMI controller board. Alarms will be generated
during the QHSO replacement procedure.
Call traffic processing through the BTS frame will not be interrupted by the QHSO replacement
procedure.
The QHSO is hot swappable.
S SI DC operating power will not be shutdown and S SI cables will not be disconnected during
the QHSO replacement procedure.
68P09283A64 -3 6 -13
FOA SEP 2007