Receive Signal Level Is Too Low - Trango Systems TrangoLINK GigaPlus User Manual

6-40 ghz split architecture high capacity point-to-point microwave backhaul system

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NOTE: MSE= -32 dB or lower is typical for 256 QAM, -29 is a worse number and is not

typical

1) Is the transmitter power set too high for the current modulation being used.

Consult the license information to verify that the power level is no higher than the

maximum allowed for the highest modulation that will be used.

2) Target RSSI setup may be incorrect. It is best to set the target RSSI as high as

possible without overdriving the receiver for the most robust operation. Setting the

target RSSI too close to the RX sensitivity threshold will compromise the link

integrity.

3) Are both GigaPlus ODUs mounted on the same polarization? ODUs must be

mounted with matching polarizations at each end of the link. If one side is mounted

on the antenna differently than the other side, the link will not lock or the signal

level will be 30 or more dB lower than expected.

4) Is the ODU installed properly on the remote mount (remote mount applications

only)? The ODU will only operate in a single orientation on the remote mount.

Follow the directions on the remote mount to ensure correct installation. The Arrow

on the remote mount must line up with the "V" on the ODU.

5) Presence of microwave transmitters on same frequency (uncommon): To check for

possible interference from other licensees, turn off the opposite end transmitter and

run the rssi command. The signal level should be -90 or lower. The level should be

steady within a dB or so.

Receive Signal Level is too low

1) Target RSSI setup may be set incorrectly (when using ATPC only). It is best to set the

target RSSI as high as possible without overdriving the receiver for the most robust

operation. Setting the target RSSI too low will result in a signal level lower than

what is expected if ATPC is enabled .

2) Reported RSSI more than 3 dB off the expected RSSI: There may be an alignment

problem with one or both antennas, especially if both sides of the link show the

Trango Systems, Inc.

GigaPlus User Manual Rev 3.1

134

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