User's Manual Part 2

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CSA System Time – GPS & HSO/MSO Verification – continued

6-50 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU MAY 2004

PRELIMINARY

Table 6-20: GPS Initialization/Verification

Step Action

7 If steps 1 through 6 pass, the GPS is good.

NOTE

If any of the above mentioned areas fail, verify that:

– If Initial position accuracy is “estimated”

(typical), at least 4 satellites must be tracked and

visible (1 satellite must be tracked and visible if actual lat, log, and height data for this site has

been entered into CDF file).

– If Initial position accuracy is “surveyed,”

position data must be of sufficient accuracy or

improper GPS receiver timing may occur.

– The GPS antenna is not obstructed or misaligned.

– GPS antenna connector center conductor measureS approximately +5 Vdc with respect to the

shield.

– There is no more than 15 dB of loss between the GPS antenna OSX connector and the BTS frame

GPS input.

– Any lightning protection installed between GPS antenna and BTS frame is installed correctly.

8 Enter the following commands at the CSA> prompt to verify that the CSA is warmed up and that GPS

acquisition has taken place.

debug dpllp

Observe the following typical response if the CSA is not warmed up (15 minutes from application of

power) (If warmed–up proceed to step 9)

CSA>DPLL Task Wait. 884 seconds left.

DPLL Task Wait. 882 seconds left.

DPLL Task Wait. 880 seconds left. ...........etc.

NOTE

The warm command can be issued at the MMI port used to force the CSA into warm–up, but the

reference oscillator will be unstable.

9 Observe the following typical response if the CSA is warmed up.

c:17486 off: –11, 3, 6 TK SRC:0 S0: 3 S1:–2013175,–2013175

c:17486 off: –11

, 3, 6 TK SRC:0 S0: 3 S1:–2013175,–2013175

c:17470 off: –11

, 1, 6 TK SRC:0 S0: 1 S1:–2013175,–2013175

c:17486 off: –11

, 3, 6 TK SRC:0 S0: 3 S1:–2013175,–2013175

c:17470 off: –11

, 1, 6 TK SRC:0 S0: 1 S1:–2013175,–2013175

c:17470 off: –11

, 1, 6 TK SRC:0 S0: 1 S1:–2013175,–2013175

10 Verify the following GPS information (underlined text above, from left to right):

– Lower limit offset from tracked source variable is not less than –60 (equates to 3µs limit).

– Upper limit offset from tracked source variable is not more than +60 (equates to 3µs limit).

– TK SRC: 0 is selected, where SRC 0 = GPS.

11 Enter the following commands at the CSA> prompt to exit the debug mode display.

debug dpllp