User's Manual Part 2

PN 8100-40 Help Hot Line (U.S. only): 1-800-530-9960 7-27
620004-0 Rev. E
System Gain
7.3.2 System Gain (Loss) Relative to UTP/STP Cable Length
The recommended minimum length of UTP/STP cable is 20 meters (66 ft) and the
recommended maximum length is 50 meters (165 ft). If the UTP/STP cable is less
than 20 meters (66 ft), system performance may not meet specifications; the absolute
minimum cable length is 10 meters (33 ft). If the UTP/STP cable is longer than 50
meters (165 ft), the gain of the system will decrease, as shown in Table 7-23.
Only shielded Cat-5 cable (STP) should be used when running parallel Cat-5 cables
for an LGCell system.
Table 7-23 System Gain (Loss) Relative to UTP/STP Cable Length
UTP/STP Cable
Length
Typical change in system gain (dB)
Downlink Uplink
800 MHz Cellular; 800 MHz iDEN; and 900 MHz GSM
and EGSM
60 m / 198 ft –0.7 –0.3
70 m / 231 ft –2.9 –2.1
80 m / 264 ft –5.1 –3.9
90 m / 297 ft –7.3 –5.7
100 m / 330 ft –9.5 –7.5
1800 MHz DCS (GSM)
60 m / 198 ft –1.2 –0.3
70 m / 231 ft –3.9 –2.1
80 m / 264 ft –6.6 –3.9
90 m / 297 ft –9.3 –5.7
100 m / 330 ft –12 –7.5
1900 MHz PCS
60 m / 198 ft –1.0 –0.3
70 m / 231 ft –3.5 –2.1
80 m / 264 ft –6.0 –3.9
90 m / 297 ft –8.5 –5.7
100 m / 330 ft –11 –7.5