mrhcarlin
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Joined 6 years ago
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Occasional spikes in latency. Getting pre RS errors on ALL downstream channels.
Hello! I'm not sure how long this has been an issue, but probably only a few days at most. I've been away since Thursday and I don't recall having issues earlier last week, but yesterday evening while gaming online I noticed (and felt) that my in game latency was spiking. Afterwards I performed a lengthy ping test and would see spikes up to and around 300ms for a few seconds. For example: Reply from 1.1.1.1: bytes=32 time=17ms TTL=56 Reply from 1.1.1.1: bytes=32 time=20ms TTL=56 Reply from 1.1.1.1: bytes=32 time=17ms TTL=56 Reply from 1.1.1.1: bytes=32 time=248ms TTL=56 Reply from 1.1.1.1: bytes=32 time=233ms TTL=56 Reply from 1.1.1.1: bytes=32 time=312ms TTL=56 Reply from 1.1.1.1: bytes=32 time=298ms TTL=56 Reply from 1.1.1.1: bytes=32 time=22ms TTL=56 Reply from 1.1.1.1: bytes=32 time=18ms TTL=56 Reply from 1.1.1.1: bytes=32 time=17ms TTL=56 So I'd get these high spikes every now and then, maybe every minute or so but sometimes in more frequent succession, and then it would settle back down. I logged into my Hub5 (I'm on Gig1) and noticed that ALL 31 channels under 3.0 Downstream were seeing Pre RS Errors - some quite significant by the looks of it (18 and 19). Channel 12 is also seeing Post RS Errors. Below is my output at time of writing. Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors 1 Locked 40 46 0 2 Locked 40 7 0 3 Locked 40 7 0 4 Locked 40 5 0 5 Locked 40 5 0 6 Locked 40 8 0 7 Locked 40 12 0 8 Locked 40 8 0 9 Locked 40 12 0 10 Locked 40 19 0 11 Locked 40 26 0 12 Locked 40 119 110 13 Locked 38 27 0 14 Locked 40 30 0 15 Locked 40 29 0 16 Locked 40 18 0 17 Locked 40 31 0 18 Locked 40 173179 0 19 Locked 39 1211972 0 20 Locked 40 77 0 21 Locked 40 49 0 22 Locked 40 49 0 23 Locked 40 58 0 24 Locked 40 39 0 25 Locked 40 52 0 26 Locked 40 53 0 27 Locked 40 55 0 28 Locked 40 76 0 29 Locked 40 69 0 30 Locked 40 53 0 31 Locked 40 133 0 Downstream power and SNR looks normal though, but correct me if I'm wrong. Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID 1 331000000 -2.3 40 QAM 256 25 2 155000000 2.1 40 QAM 256 3 3 163000000 1.7 40 QAM 256 4 4 171000000 1.1 40 QAM 256 5 5 179000000 0.9 40 QAM 256 6 6 187000000 0.5 40 QAM 256 7 7 195000000 0.2 40 QAM 256 8 8 203000000 0.2 40 QAM 256 9 9 211000000 0.4 40 QAM 256 10 10 219000000 -1 40 QAM 256 11 11 227000000 -1.1 40 QAM 256 12 12 235000000 -1.2 40 QAM 256 13 13 243000000 -1.6 38 QAM 256 14 14 251000000 -1.8 40 QAM 256 15 15 259000000 -1.9 40 QAM 256 16 16 267000000 -2.1 40 QAM 256 17 17 275000000 -2.6 40 QAM 256 18 18 283000000 -2.8 40 QAM 256 19 19 291000000 -3 39 QAM 256 20 20 299000000 -2.8 40 QAM 256 21 21 307000000 -2.2 40 QAM 256 22 22 315000000 -2.1 40 QAM 256 23 23 323000000 -2.4 40 QAM 256 24 24 339000000 -2 40 QAM 256 26 25 347000000 -2 40 QAM 256 27 26 355000000 -2 40 QAM 256 28 27 363000000 -1.9 40 QAM 256 29 28 371000000 -2.3 40 QAM 256 30 29 379000000 -2.3 40 QAM 256 31 30 387000000 -2.3 40 QAM 256 32 31 395000000 -2.7 40 QAM 256 34 Not entirely sure what the other two downstream tables are showing, but here's their outputs as well. 3.1 Downstream channels Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz) 33 94 4K 1840 QAM 4096 1108 3.1 Downstream channels Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile) 33 Locked 38 -10.1 1256043283 8 Not sure if those "corrected" and "uncorrectable" errors are anything to be concerned about. Upstream page as well: 3.0 Upstream channels Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID 0 49600000 48.3 5120 QAM 64 1 1 43100000 48.3 5120 QAM 64 2 2 36600000 48 5120 QAM 64 3 3 30100000 47.5 5120 QAM 64 4 4 23600000 47 5120 QAM 64 5 3.0 Upstream channels Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts 0 ATDMA 0 0 0 0 1 ATDMA 0 0 0 0 2 ATDMA 0 0 0 0 3 ATDMA 0 0 0 0 4 ATDMA 0 0 0 0 3.1 Upstream channels Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation 6 10.4 44.2 2K QAM 256 3.1 Upstream channels Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts 6 OFDMA 208 74000000 0 0 ... So looks like something might be off about the downstream. The Hub has been restarted and the issue persists. If someone could kindly help that'd be much appreciated. Thanks.336Views0likes2Comments