Can someone help me find what's wrong with my internet?
Can someone help me find what's wrong with my internet?
Hello, looking for some assistance in figuring out what could be causing some internet issues as i'm not a big networking guy. Roughly a week ago, I noticed a severe drop in download speeds (from roughly 800mbps to 30mbps) as well as extremely varied packet latency (jumping between 20ms to 170ms all over the place) and started doing some troubleshooting. I did the usual of checking the PC connections, power cycling the modem, re-seating the connectors on the modem, and changing IPs/using a VPN to check for throttling. Of all the steps, power cycling seemed to recover some download speed but would quickly dip back to around 30mbps after 10-20 minutes. I called my ISP(Cox) to try and see if it was on their end potentially, and was told that my modem was throwing errors and that they'd send a new one. While i've been waiting on that new modem, I did a bit of digging into both the modem's control panel, as well as the coax lines, at the behest of a friend that knows a little bit about networking. I discovered two potential problems; the modem is showing a lot of Uncorrectable Codewords in its CM Error Codeword table as well as showing some very confusing data under its Downstream Channel Value table. The second potential problem is that the coax line runs outside to a splitter (more than likely to provide a coax out port to the upper floors of our house) and it's exposed to a lot of sea air and looks fairly crusted. Below are the tables for those that can better help me interpret this. Downstream Channel Bonding Value Index 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 23 24 25 26 27 28 29 30 31 32 160 159 160 Lock Status Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Not locked Locked Locked Locked Not locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Locked Frequency 237 MHz 117 MHz 123 MHz 129 MHz 135 MHz 141 MHz 147 MHz 153 MHz 159 MHz 165 MHz 171 MHz 177 MHz 183 MHz 189 MHz 195 MHz 201 MHz 207 MHz 213 MHz 219 MHz 225 MHz 231 MHz 243 MHz 249 MHz 255 MHz 735 MHz 741 MHz 747 MHz 753 MHz 759 MHz 765 MHz 771 MHz 777 MHz 918 MHz 300000000 918000000 SNR 38.8 dB 0.0 dB 30.7 dB 33.3 dB 33.8 dB 34.0 dB 32.6 dB 32.7 dB 35.5 dB 35.2 dB 35.8 dB 0.0 dB 0.0 dB 0.0 dB 33.4 dB 0.0 dB 35.5 dB 36.9 dB 37.7 dB 37.9 dB 38.5 dB 38.7 dB 38.9 dB 39.2 dB 41.3 dB 41.6 dB 42.1 dB 41.5 dB 41.9 dB 40.8 dB 42.2 dB 42.3 dB 41.8 dB 40.5 dB 41.8 dB Power Level -14.0 dBmV -18.4 dBmV -17.9 dBmV -17.5 dBmV -17.1 dBmV -17.1 dBmV -17.5 dBmV -17.7 dBmV -16.8 dBmV -16.4 dBmV -16.6 dBmV -16.6 dBmV -17.2 dBmV -16.8 dBmV -15.8 dBmV -15.3 dBmV -15.5 dBmV -14.9 dBmV -14.8 dBmV -14.7 dBmV -14.3 dBmV -14.1 dBmV -14.0 dBmV -13.3 dBmV -6.7 dBmV -6.8 dBmV -6.5 dBmV -6.4 dBmV -6.1 dBmV -6.4 dBmV -6.5 dBmV -6.1 dBmV -4.2 dBmV -11.4 dBmV -4.2 dBmV Modulation 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM Unknown 256 QAM 256 QAM 256 QAM Unknown 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM OFDM OFDM OFDM Upstream Channel Bonding Value Index 1 2 3 4 5 Lock Status Locked Locked Locked Locked Locked Frequency 17 MHz 23 MHz 30 MHz 36 MHz 36 MHz Symbol Rate 5120 5120 5120 5120 0 Power Level 54.5 dBmV 54.5 dBmV 54.5 dBmV 54.0 dBmV 48.0 dBmV Modulation QAM QAM QAM QAM OFDMA Channel Type ATDMA ATDMA ATDMA ATDMA TDMA CM Error Codewords Index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Unerrored Codewords 1972479251 2431437560 3063165197 3373375786 3374150541 3300587745 3326035817 3114249000 3020065804 3199949306 3171533606 0 3166815406 3045590408 3211027557 0 3366325277 3379482952 3379417352 3268271843 3061524235 3382717320 3382751716 3383096845 3383146262 3383150816 3383153370 3383160725 3383165227 3383166349 3383168212 3383172088 2101973990 1972479251 Correctable Codewords 1451921227 602293515 251834055 2813908 3050364 2042664 3272381 31232213 1342312 1620779 1523833 0 670441 561525 498908 0 369798 321577 299296 241593 182756 124929 133435 30807 300 282 277 242 231 218 215 284 2029660604 1451921227 Uncorrectable Codewords 9076 243631633 54874447 3508315 3522370 3038371 3461326 3763517 3035532 3518963 3070905 0 1627686 1440926 1324243 0 1077284 1007733 927575 734210 497447 287997 250828 13596 1 0 0 0 0 0 0 272 18989 9076 I've been power cycling the modem every 24 hours and checking these charts every 24 hour period and its been consistently like this for at least 3 days. My question is what is the most probable cause? A bad modem, corroded cabling, or a fault directly with the ISP? And, what steps should I take to resolve these issues? Thank you for taking the time to look at this, i'd appreciate any help in getting some answers.
Signal levels are not working well. The problem might start where the signal goes in, so check those first, but it could also be happening along the way too. Sometimes a little bit of water gets into one connection and makes everything else act up. It sounds like this is more about cables than anything else, though you can try checking the wires inside your house before giving the internet company a call.
Don't let Cox act too lazy. Make sure someone from the company goes over to your home.