User's Manual Part 1

Designing an LGCell Solution

7-26 LGCell 4.0 Installation, Operation, and Reference Manual PN 8100-40

620004-0 Rev. E

7.3.1 System Gain (Loss) Relative to MMF Cable Length

If the length of MMF cable is less than 1 km (3300 ft), the system gain will increase.

If the cable length is between 1 km (3300 ft) and 2 km (6600 ft), the system gain will

decrease as the cable length increases. Use the following formula for determining the

nominal gain (or loss) of the LGCell. The length of the MMF cable is denoted by L:

The optical power budget between the Main Hub and Expansion Hub, both downlink

and uplink, is 3 dB optical. If fiber distribution panels are used, confirm that the total

optical loss of fiber cable, from the Main Hub through distribution panels and patch

cords to the Expansion Hub, does not exceed 3 dB optical.

MMF Cable Length System Gain (dB)

1 m / 3.3 ft +3

500 m / 1650 ft +1.5

1000 m / 3300 ft 0

1500 m / 4950 ft –1.5

2000 m / 6600 ft –3

MMF cable length greater than 2 km (6600 ft) is not rec-

ommended.

gain (dB) = 3*(1 – )

1000