User's Manual

Download the BTS68P09255A61-4
Aug 2002
1X SC 4812T BTS Optimization/ATP Software Release 2.16.1.x
FIELD TRIAL
3-29
The BTS may be equipped with a remote GPS, LORAN-C LFR, HSO
10 MHz Rubidium source, or HSOX for expansion frames, which the
CSM can use as a secondary timing reference. In all cases, the CSM
monitors and determines what reference to use at a given time.
NOTE
- CSMs are code loaded at the factory. This data is retained
in EEPROM. The download code procedure is required in
the event it becomes necessary to code load CSMs with
updated software versions. Use the status function to
determine the current code load versions.
- For non-RGPS sites only, verify the CSM configured with
the GPS receiver “daughter board” is installed in the
CSM-1 slot before continuing.
- The CSM(s) to be enabled must have been downloaded
with code (Yellow, OOS-RAM) and data.
Follow the procedure in Table 3-15 to enable the CSMs.
Table 3-15: Enable CSMs
 Step Action
1 Verify the CSM(s) have been downloaded with code (Yellow, OOS-RAM) and data.
2
Click on the target CSM.
From the Device pull down, select Enable.
NOTE
If equipped with two CSMs, enable CSM-2 first and then CSM-1.
A status report confirms change in the device(s) status.
Click OK to close the status window.
NOTE
FAIL may be shown in the status table for enable action. If Waiting For Phase Lock is shown in
the Description field, the CSM changes to the enabled state after phase lock is achieved. CSM-1
houses the GPS receiver. The enable sequence can take up to one hour to complete.
NOTE
The GPS satellite system satellites are not in a geosynchronous orbit and are maintained and
operated by the United States Department of Defense (D.O.D.). The D.O.D. periodically alters
satellite orbits; therefore, satellite trajectories are subject to change. A GPS receiver that is INS
contains an “almanac” that is updated periodically to take these changes into account.
If an installed GPS receiver has not been updated for a number of weeks, it may take up to one
hour for the GPS receiver “almanac” to be updated.
Once updated, the GPS receiver must track at least four satellites and obtain (hold) a 3-D position
fix for a minimum of 45 seconds before the CSM will come in-service. (In some cases, the GPS
receiver needs to track only one satellite, depending on accuracy mode set during the data load.)
NOTE
If equipped with two CSMs, the LMF should display CSM-1 as bright GREEN (INS-ACT) and
CSM-2 as dark green (INS-STB). After the CSMs have been successfully enabled, the
PWR/ALM LEDs are steady green (alternating green/red indicates the card is in an alarm state).
3 If more than an hour has passed, refer to Table 3-19 and Table 3-20 to determine the cause.
3