User's Manual

CSM System Time/GPS and LFR/HSO Verification68P09255A61-4
Aug 2002
1X SC 4812T BTS Optimization/ATP Software Release 2.16.1.x
FIELD TRIAL
3-39
Table 3-19: GPS Initialization/Verification
Step Action
10 Observe the following typical response if the CSM 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
11 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.
12 Enter the following commands at the CSM> prompt to exit the debug mode display.
debug dpllp
LFR Initialization/Verification
The LORAN-C LFR is a full size card that resides in the C-CCP Shelf.
The LFR is a completely self-contained unit that interfaces with the
CSM via a serial communications link. The CSM handles the overall
configuration and status monitoring functions of the LFR.
The LFR receives a 100 kHz, 35 kHz BW signal from up to 40 stations
(8 chains) simultaneously and provides the following major functions:
 Automatic antenna pre-amplifier calibration (using a second
differential pair between LFR and LFR antenna)
 A 1 second ±200 ηs strobe to the CSM
If the BTS is equipped with an LFR, follow the procedure in Table 3-20
to initialize the LFR and verify proper operation as a backup source for
the GPS.
NOTE
If CSMRefSrc2 = 2 in the CDF file, the BTS is equipped with
an LFR. If CSMRefSrc2 = 18, the BTS is equipped with an
HSO.
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