User's Manual

CSM System Time – GPS and HSO Verification – continued
3-48 1X SC 4812T Lite BTS Optimization/ATP FEB 2005
PRELIMINARY
Secondary Timing References
The BTS may be equipped with a High Stability Oscillator (HSO), or
External 10 MHz Rubidium Source that the CSM can use as a Secondary
Timing Reference. Continuous GPS Synchronization is maintained for
the HSO Secondary Timing References. The CSM monitors and
determines what reference to use at a given time..
Timing Source Fault Management
Fault Management has the capability of switching between the GPS
Synchronization Source and the HSO Back–up Source in the event of a
GPS Receiver failure. During normal operation, the CSM Card in the
CSM 1 Slot selects GPS as the Primary Timing Source (Table 3-24). The
Source Selection can also be overridden via the LMF or by the System
Software..
Front Panel LEDs
The status of the LEDs on the CSM Cards are as follows:
Table 3-22: CSM Card PWR/ALM LED States
LED State Device Status
Solid GREEN Master CSM is locked on to the GPS or
LFR while operating in INS_ACTIVE or
INS_STANDBY Mode.
– No alarm present.
Solid RED 1. Color during System Initialization.
2. Alarm (Fault) Mode
– An alarm is being reported.
Fast Flashing GREEN Standby CSM is locked on to the GPS or
LFR while in INS_STANDBY Mode.
– No alarm present.
Alternating
Slow Flashing RED/
Fast Flashing GREEN
OOS_ROM Mode
– An alarm is being reported.
Fast Flashing GREEN 1. OOS_RAM Mode
2. INS_ACTIVE Mode in DUMB
Configuration.
– No alarm present.
Alternating
Fast Flashing RED/
Fast Flashing GREEN
OOS_RAM Mode
– An alarm is being reported.
table continued on next page
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