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Forum Discussion

Amanda19's avatar
Amanda19
Aspirant
May 21, 2019

CM 500 sync timing failure

My modem keeps giving me the same error of: SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing. My cable provider says that its an issue with the modem itself but this t...
FURRYe38's avatar
FURRYe38
Guru - Experienced User
May 21, 2019

Check the RG6 cabling from the modem out to the ISP box maybe on the side of the house. Make sure there is not cable line splitters between the ISP service box and the modem. If the modem worked at old home and not new home. Means possible cabling issue between modem and ISP service box. 

  • Amanda19's avatar
    Amanda19
    Aspirant
    May 21, 2019
    There's splitters out there and I made sure they were tight at least. There's no box outside. It's a cable straight from the main line to my house.
    • FURRYe38's avatar
      FURRYe38
      Guru - Experienced User
      May 21, 2019

      Remove all splitters temporarily and try again. Possible these splitters are causing problems.