User Manual

Test Equipment Set–up – continued
PRELIMINARY 2
SC 4812ET BTS Optimization/ATP – CDMA LMF
July 1999
3-42
Equipment Warm-up
Warm-up BTS equipment for a minimum of 60 minutes
prior to performing the BTS optimization procedure. This
assures BTS site stability and contributes to optimization
accuracy. (Time spent running initial power-up,
hardware/firmware audit, and BTS download counts as
warm-up time.)
IMPORTANT
*
Null Modem Cable
A null modem cable is required. It is connected between the LMF
COM1 port and the RS232–GPIB Interface box. Figure 3-14 shows the
wiring detail for the null modem cable.
Figure 3-14: Null Modem Cable Detail
5
3
2
7
8
1
4
6
5
2
3
7
8
1
4
6
GND
RX
TX
RTS
CTS
RSD/DCD
DTR
DSR
GND
TX
RX
RTS
CTS
RSD/DCD
DTR
DSR
ON BOTH CONNECTORS:
 SHORT PINS 7 & 8;
 SHORT PINS 1, 4, & 6
9–PIN D–FEMALE 9–PIN D–FEMALE
Test Equipment
The following test equipment is required to perform the tests:
 LMF
 CDMA Communications Test Set
 Directional Coupler and Attenuator
 RF Cables and connectors
Before installing any test equipment directly to any BTS
TX OUT connector, verify there are NO CDMA BBX
channels keyed. At active sites, have the OMC-R/CBSC
place the antenna (sector) assigned to the LPA under test
OOS. Failure to do so can result in serious personal injury
and/or equipment damage.
WARNING
To prevent damage to the test equipment, all transmit (TX)
test connections must be through the 30 dB directional
coupler and, for 1.9 GHz BTS, a 20 dB in-line attenuator.
CAUTION
3