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COM 3000Troubleshooting
Date: Jan 2024 Version 1
4.5 QAM OUTPUT STRENGTH / QUALITY
Use a test TV and field strength meter to evaluate picture quality directly from the COM3000 QAM output.
Signal from the QAM will need to be attenuated to correct level to input to a TV (-5-+10dBmV).
A known good setback box is a good troubleshooting tool to verify picture quality.
BCM_Rfmicro Error
If the COM51 syslog contains multiple BCM_Rfmicro errors, then there is not enough attenuation between the
COM51 and SWiM. Attenuation should be added between the SWiM and the COM51. The error indicates that the
COM51 did not receive the expected SWiM protocol messages from the SWiM. This may cause SWiM registration
errors. DIRECTV recommends a DRE pass through tap.
4.6 QAM LOG
Each time the qamLog is read, several capital 'C' characters are appended to the end of the log. To determine if
the QAM4 is functioning properly click the qamLog button a few times with several seconds between presses.
Ideally the qamLog will show 'CCCCCCCCC' at the end of the log as shown below.
EdgeQAM Modulator
Getting log
OK
OKtemp=45 temp=46 temp=45 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCtemp=46 temp=45 CCCCCCCCCCCCCtemp=46 PM
T00 P00 CCCc00 PAT PMT01 P01 c01 PAT CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
CCC
A lower case 'c' followed by two numbers indicates a continuity counter error which indicates missing packets.
Add one to the first number to determine the QAM carrier.
Add one to the second number to determine the program number.
For example, 'c12' indicates that the second QAM carrier, third program has missing packets.
A 'P##' indicates a PCR time continuity with the two numbers meaning the same as above. Many errors often
indicate that two different video sources are being sent to the same UDP port.
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