User's Manual

WiMax Optical Fiber Repeater 10W Installation and Operation Manual
Document No. 913011900 Rev. 1.1 Proprietary Document
3-6
3.3.1 System Setup Instructions
General.
The set-up of Host and Remote units FWD gains are based on maximum power considerations.
This means that whenever the BTS transmits at maximum power, the Remote unit will also
transmit at maximum power.
The set-up of the Host and Remote units RVS gains is based on known noise level introduction
into the BTS
Make sure that you have a documented test results of the optical fiber link loss. Otherwise,
measure it and record the results.
Make sure that the fiber termination type is FC/APC.
Use the following guidelines to set-up the Host and Remote units:
Host Unit:
• Determine the absolute maximum input power to the Host unit input connector
(under the heaviest traffic conditions); let this be P
inmax
[dBm].
• Set the Host unit FWD gain to 0- P
inmax
[dB]. (This is in order to enter the fiber at 0
dBm).
• If symmetrical link is requested, set the RVS gain to the same value as the FWD
gain.
• If permitted, set the RVS gain 3 dB less than the FWD gain.
Remote Unit:
• Set the Remote unit FWD gain to the numerical value of the maximum output
power of the unit in dBm, plus the absolute value of the RF loss of the fiber (in dB).
• Set the RVS gain to the same value as the FWD gain.
NOTE: If reduced coverage is required, reduce the gains respectively.
3.3.2 Remote Unit FWD Gain Optimization
NOTE:
The RVS gain must be approximately equal to the FWD gain of
the Remote unit.