User's Manual

CSM System Time/GPS and LFR/HSO Verification – continued
SC 4812T CDMA BTS Optimization/ATP
May 2000
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HSO Initialization/Verification
The HSO module is a full–size card that resides in the C–CCP Shelf.
This completely self contained high stability 10 MHz oscillator
interfaces with the CSM via a serial communications link. The CSM
handles the overall configuration and status monitoring functions of the
HSO. In the event of GPS failure, the HSO is capable of maintaining
synchronization initially established by the GPS reference signal for a
limited time.
The HSO is typically installed in those geographical areas not covered
by the LORAN–C system and provides the following major functions:
 Reference oscillator temperature and phase lock monitor circuitry
 Generates a highly stable 10 MHz sine wave.
 Reference divider circuitry converts 10 MHz sine wave to 10 MHz
TTL signal, which is divided to provide a 1 PPS strobe to the CSM.
Prerequisites
 The LMF is not logged into the BTS.
 The COM1 port is connected to the MMI port of the primary CSM via
a null modem board.
 The primary CSM and the HSO (if equipped) have warmed up for 15
minutes.
If the BTS is equipped with an HSO, follow the procedure in Table 3-20
to configure the HSO.
Table 3-20: HSO Initialization/Verification
Step Action
1 At the BTS, slide the HSO card into the cage.
NOTE
The LED on the HSO should light red for no longer than 15-minutes, then switch to green. The CSM
must be locked to GPS.
2 On the LMF at the CSM> prompt, enter sources <cr>.
– Observe the following typical response for systems equipped with HSO:
Num Source Name Type TO Good Status Last Phase Target Phase Valid
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
0 Local GPS Primary 4 Yes Good 0 0 Yes
1 HSO Backup 4 Yes N/A xxxxxxx –69532 Yes
2 Not used
Current reference source number: 0
When the CSM is locked to GPS, verify that the HSO “Good” field is Yes and the “Valid” field is Yes.
3 If source “1” is not configured as HSO, enter at the CSM> prompt: ss 1 12 <cr>
Check for Good in the Status field.
4 At the CSM> prompt, enter sources <cr>.
Verify the HSO valid field is Yes. If not, repeat this step until the “Valid” status of Yes is returned. The
HSO should be valid within one (1) minute, assuming the DPLL is locked and the HSO Rubidium
oscillator is fully warmed.
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