CQM Graphs: Difference between revisions

(Not an ADSL Fault.) The example above show a line with occasional short uploads causing spikes in peak latency, and then a sustained upload starting at around 6pm and causing high latency (queue in the router). At 8pm there was more upload filling the link causing higher latency still and some loss (normal when the link is full). This is normal. Also see: [[Packet Loss]]

(Probably not an ADSL Fault.) If a line is dropping during the day, and maybe just Monday to Friday, then it's probably not going to be an upstream problem. This could be caused by interference of bad wing on site. Check things like the phone line and extensions. Put the router in master socket and to unplug all other phones. Maybe change filter.

(Not an ADSL Fault.) This latency and loss was caused by a fault Netgear switch on the LAN side of a Vigor router! The switch had failed to the point where it wouldn't talk gigabit but would talk 100M unreliably. Guess it was maxing router CPU perhaps. It's unknown how this affected the Vigor, but perhaps the switch was faulty enough to upset the Vigor causing it to delaying or not replying to the LCP echos. In this case unplugging the LAN side of the router would show a normal looking graph, indicating the fault is somehow caused by something on the LAN.