LGC wireless InterReach Fusion SingleStar, Инструкция по установке и эксплуатации, Страница: 57 / 154

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System Gain
5.3 System Gain
The system gain of the Fusion SingleStar defaults to 0 dB or can be set up to 15 dB in
1 dB increments. In addition, uplink and downlink gains of each RAU can be inde-
pendently decreased by 10 dB in one dB steps using AdminBrowser.
5.3.1 System Gain (Loss) Relative to CATV Cable Type Length
The recommended minimum length of CATV cable is 10 meters (33 ft) and the rec-
ommended maximum lengths are as follows:
• For RG-59 cable 150 meters (492 ft).
• For RG-6 cable 200 meters (656 ft).
• For RG-6 cable 300 meters (984 ft).
If the system is operated with CATV cable less than 10 meters (33 ft) in length, sys-
tem performance will be greatly compromised.
If the CATV cable is longer than the recommended distance per cable type, the gain
of the system will decrease, as shown in Table 5-7.
Table 5-7
System Gain (Loss) Relative to CATV Cable Length
Typical change in system gain (dB)
RG-59 Downlink Uplink
800 MHz iDEN, 850 MHz GSM and CDMA; 900 MHz
GSM and EGSM, and iDEN
180 m –1.0 –0.7
190 m –3.2 –2.4
200 m –5.3 –4.1
220 m –7.5 –5.8
240 m –9.7 –7.6
1800 MHz GSM (DCS); 1900 MHz TDMA, CDMA, and
GSM
180 m –1.0 –0.7
190 m –4.0 –2.4
200 m –6.4 –4.1
220 m –8.8 –5.8
240 m –11.3 –7.6
2.1 GHz UMTS
180 m –1.0 –0.7
190 m –3.2 –2.4