I just upgraded to the 1 Gig internet service and my download speeds have topped out at about 550 Mbps. I have tried connecting 2 different pc's via wired ethernet (Cat 6a) both with internal nics connecting at 1 Gbps directly to my modem (an Arris SB 8200) (and rebooted the modem both times) and don't get any more speed then that. My modem status page shows the below for the OFDM channel -
200 Locked Other 261000000 Hz -0.9 dBmV 36.8 dB 2647855 25
Also getting this error in the modem event log
Critical(3) "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=XX;XX:XX:XX CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1
Is it possible that the OFDM channel was never turned on at the node? See this thread - https://www.dslreports.com/forum/r31242822-Arris-SB8200?search=sb8200%20
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