User manual

DTS Broadcast PDH Microwave Digital Radio User Manual
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If resistance is unmeasurable:
• Cable is open circuit
• Check the cable thoroughly over whole length and at both ends for damage or reasons that
would cause an open circuit condition (e.g. connector not terminated correctly and/or badly corroded or
cable cut)
• If in doubt re-terminate both ends of cable with new connectors.
Re-measure cable resistance (with it disconnected at both ends), resistance should be unmeasurable or
open circuit.
• If cable resistance is unchanged; replace cable, terminating with new connectors.
• If cable is cut, replace entire cable run, terminating with new connectors.
Transmit power
Alarm condition indicates low power output from final stage of microwave power amplifier.
If this alarm occurs, please confirm transmit power is on first, and then replace the ODU if the
alarm is not dispeared.
TX PLL
Alarm condition indicates the transmitter phase-locked-loop has lost lock.
If this alarm occurs on its own, replace the ODU.
If this alarm occurs in conjunction with the RX PLL and RF PLL, replace the IDU (reference
source failure).
Receive PLL
Alarm condition indicates the receiver phase-locked-loop has lost lock.
If this alarm occurs on its own, replace the ODU.
If this alarm occurs in conjunction with the TX PLL and RF PLL, replace the IDU (reference
source failure).
RF PLL
Alarm condition indicates the receiver phase-locked-loop has lost lock.
If this alarm occurs on its own, replace the ODU.
If this alarm occurs in conjunction with the TX PLL and RX PLL, replace the IDU (reference
source failure).