User Manual

Download the BTS – continued

July 1999

3-27

SC 4812ET BTS Optimization/ATP – CDMA LMF

PRELIMINARY 2

Table 3-18: Enable CSMs

 Step Action

1 Click on the target CSM.

From the Device pull down, select Enable.

NOTE

If equipped with two CSMs, enable CSM–2 first

A status report is displayed confirming change in the device(s) status.

Click OK to close the status report 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 (see below).

* IMPORTANT

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 a GPS receiver has not been updated for a number of weeks, it may take up to an 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, CSM–1 should be bright green (INS–ACT) and CSM–2 should be

dark green(INS–STB)

If more than an hour has passed, refer to CSM Verification, see Figure 3-20 and Table 3-21 to

determine the cause.

NOTE

After the CSMs have been successfully enabled, observe the PWR/ALM LEDs are steady green

(alternating green/red indicates the card is in an alarm state).