WaveRider LMS4000, Руководство пользователя

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12 Troubleshooting
APCD-LM043-4.0 145
12.2 CCU Troubleshooting
CCU troubleshooting can be broken down into several areas, based on the working history of
the CCU, the nature of the reported problem, and the extent of the reported problem. For the
purpose of this troubleshooting section, it is assumed that the CCU has been installed
according to the guidelines provided by WaveRider and EUMs have been successfully
deployed and operated. Subsequent problems can then be divided into the following
categories:
• Unable to add new EUMs
• New EUMs cannot get service
• Adding new EUMs causes degraded performance to existing EUMs
• Complaints of degraded performance
• Customer complaints of slow throughput
• Service outages
• All customers have no service
• Some customers have no service
• Key Statistics (refer to Monitoring the Network on page 127) indicate an increase in
retransmitted and/or lost packets
The possible causes for these problems can be identified as follows:
• Configuration error at CCU
• System congestion
• Impacts EUMs depending on their assigned GOS level
• Presence of an interferer
• Impacting the CCU
• Impacting all or most EUMs in the sector
• Hardware failure of the CCU system (CCU, power, antenna, etc.)
• Impacts all EUMs in the sector
Regardless of the extent of the reported problem, there exist remote and local tests that can
be used to isolate the cause.
Since there are so many possible entry levels to a troubleshooting procedure, the following
troubleshooting guides are intended to provide suggested tests that can be carried out as part
of the troubleshooting process. Some tests may not be required in all scenarios and good
judgement should be used when carrying out the tests.
The remote CCU tests outlined in Table 34 on page 146 are generally useful as a starting point
for all CCU troubleshooting. These tests should be carried out prior to performing the local
tests outlined in
Table 35 on page 147 , keeping in mind the remote tests can be carried out
locally using the serial port to access the CLI command set.