Installation Instructions

BTS Configuration – continued
PRELIMINARY
SCt300 BTS Hardware Installation, ATP and FRU Procedures
DEC 2000
7-22
Table 7-9: Verify DPLL Tracking
Step Action
10 Verify that the DPLL is “tracking” either the RGPS or HSO. The DPLL must have a Current
source set to of GPS reference or HSO reference. The DPLL must also have a
DPLL control task state of DPLL track.
11 If no additional MMI sessions are required at this time, exit the MMI session and HyperTerminal
connection by selecting File>Exit.
If you are continuing the MMI session, proceed to Table 7-10.
Location Coordinates
The BTS supplies the RGPS with default startup coordinates (latitude
and longitude) in order to assist the RGPS in tracking satellites. The
default startup coordinates can be modified and saved into non–volatile
memory to speed the tracking of satellites.
Use the procedure in Table 7-10 to verify and, if necessary, modify the
default startup coordinates. The procedure in Table 7-10 is only
applicable to sites equipped with an RGPS.
Table 7-10: Verify Default Startup Coordinates
Step Action
1 If an MMI session was established, proceed to step 6. If no MMI session is running, proceed to
step 2.
2 Connect the LMF/MMI.
3 Open an MMI Communication session.
4 Simulate an LMF connection by issuing the sndtype 0xa178 command.
5 Verify that the BTS is in OOS_RAM status by issuing the status command.
6 Issue the dpll_status command to display the current state of the DPLL. Verify that the DPLL
has a ”Current source set to” of GPS reference and a ”DPLL control task state” of DPLL
track. The DPLL must be tracking GPS in order to complete this procedure.
7
* IMPORTANT
The values for longitude and latitude in response to the gps_status command are given in units
of milli arcseconds Be careful to record the values accurately including any leading negative ( )
o
f
m
illi
–arcsecon
d
s.
B
e care
f
u
l
to recor
d
t
h
e va
l
ues accurate
l
y
i
nc
l
u
di
ng any
l
ea
di
ng negat
i
ve
(
–
)
signs. The value of Current Height is given in units of centimeters.
Enter the gps_status command.
8 Record the values displayed for Current Longitude, Current Latitude and
Current Height.
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