Installation Instructions

BTS Configuration – continued
PRELIMINARY
SCt300 BTS Hardware Installation, ATP and FRU Procedures
DEC 2000
7-18
It is imperative that the customer frequency be programmed into this
database. Failure to do so may result in the RF interference to other
RF–emitting devices in the local area whenever the site is powered up.
Table 7-7: Updating Default Channel Setting to Customer Operating Channel
Step Action
1 Connect the LMF computer terminal to the MMI/LMF connector. Refer to Figure 7-7.
2 If you have not already done so, logout of the BTS and exit the LMF. Wait 10 seconds before
proceeding.
3 Establish an MMI connection session with the BTS. Refer to Table 7-6.
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 Enter the op_param –w –50 chan# command.
–w instructs the BTS to write the values into non–volatile memory.
–50 defaults the power to –50dBm
chan# the customer operating channel (76–724)
If the command is successful, the following response will display:
PASSED: TRX EEPROM updated for power level = –50 (dBm) and channel =
chan#
7 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 7-8.
Synchronization Background
GPS
GPS is typically used as the primary timing reference for CDMA BTSs.
In applications where RGPS is used, the BTS is said to be synchronous
with CDMA system time. The RGPS provides a 1 Pulse Per Second
timing reference and Time Of Day information to allow the BTS to
synchronize to CDMA system time.
HSO
A High Stability Oscillator (HSO) within the BTS provides a backup
timing reference in the event of a GPS outage. Using only the HSO, the
BTS can maintain CDMA system time for up to 24 hours. The BTS can
also use the HSO as the primary timing reference (non–synchronous
operation). However, synchronization to CDMA system time is not
possible. The HSO provides a 1 Pulse Per Second timing reference to
allow the BTS to remain synchronized to CDMA system time in the
event of a GPS outage (synchronous operation) or to provide a stable
frequency reference (non–synchronous operation).
7