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6-23
D-620003-0-20 Rev J
CONFIDENTIAL
System Gain
6.3
System Gain
The system gain can be decreased from 15 dB to 0 dB gain in 1 dB increments and
the uplink and downlink gains of each RAU can be independently decreased by
10 dB in one step using AdminManager or OpsConsole.
a
6.3.1
System Gain (Loss) Relative to ScTP Cable Length
The recommended minimum length of ScTP cable is 10 meters (33 ft) and the recom-
mended maximum length is 100 meters (328 ft). The system should not be operated
with ScTP cable that is less than 10 meters (33 ft) in length, system performance is
greatly compromised. If the ScTP cable is longer than 100 meters (328 ft), the gain of
the system decreases, as shown in Table 6-23.
Table 6-23
System Gain (Loss) Relative to ScTP Cable Length
ScTP Cable
Length
Typical change in system gain (dB)
ScTP with CAT-5
Extender
Downlink
Uplink
800 MHz TDMA/AMPS and CDMA; 900 MHz GSM and EGSM; and iDEN
180 m
110 m / 361 ft
–1.0
–0.7
190 m
120 m / 394 ft
–3.2
–2.4
200 m
130 m / 426 ft
–5.3
–4.1
210 m
140 m / 459 ft
–7.5
–5.8
220 m
150 m / 492 ft
–9.7
–7.6
1800 MHz GSM (DCS); 1900 MHz TDMA, CDMA, and GSM
180 m
110 m / 361 ft
–1.0
–0.7
190 m
120 m / 394 ft
–4.0
–2.4
200 m
130 m / 426 ft
–6.4
–4.1
210 m
140 m / 459 ft
–8.8
–5.8
220 m
150 m / 492 ft
–11.3
–7.6
2.1 GHz UMTS
a
; 1.7/2.1 GHz AWS
a. For Japan, refer to the separate addendum:
Japan Specification Document
.
180 m
110 m / 361 ft
–1.0
–0.7
190 m
120 m / 394 ft
–3.2
–2.4
200 m
130 m / 426 ft
–5.3
–4.1
210 m
140 m / 459 ft
–7.5
–5.8
220 m
150 m / 492 ft
–9.7
–7.6
