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Internet no longer works when splitter is connected

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hey,  I have my cable modem set up in my office along with a tv.  For a year my set up has worked perfectly.  For some reason,  my cable modem can no longer sync if the "Comcast Supplied" splitter is being used, so I can no longer watch tv and use the internet.  Any ideas,  with the coax plugged directly into the modem I get 37dB SNR.  WIth the splitter attached it will not even sync.  Any ideas?? FYI,  I have a motorola surfboard sb6121 DOCSIS 3.0 modem.

 

More Info:: splitter not connected...

 

Channel ID 84 81 82 83
Frequency 627000000 Hz 609000000 Hz 615000000 Hz 621000000 Hz
Signal to Noise Ratio 37 dB 37 dB 37 dB 37 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
-3 dBmV -3 dBmV -2 dBmV -3 dBmV

Channel ID 4 5 6
Frequency 21000000 Hz 27900000 Hz 34800000 Hz
Ranging Service ID 813 813 813
Symbol Rate 5.120 Msym/sec 5.120 Msym/sec 5.120 Msym/sec
Power Level 51 dBmV 49 dBmV 47 dBmV
Upstream Modulation [3] QPSK
[3] 16QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM

Ranging Status Success Success Success

Channel ID 84 81 82 83
Total Unerrored Codewords 27163423837 14278522057 14278521933 14278521734
Total Correctable Codewords 63 20 81 221
Total Uncorrectable Codewords 686 618 688 749


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