They don't mean much without data to match them up with.
Type 192.168.0.1 into your browser URL bar and press enter. When the page appears DO NOT LOG IN but click ‘Check Router Status’. Copy and paste the contents of each tab onto here, a Guru will be along soon to decipher the info.
No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
I can certainly tell you what the messages actually mean if you like, but it's not uncommon to get a couple of these periodically, it's only an issue if they are occurring very frequently (many times a day) and/or you are having issues with your internet connection. The DOCSIS (cable internet) technology is actually designed to be very tolerant of faults and intermittent partial drops - although the hub logs when an error occurs, it doesn't subsequently log all of the succeeding successful connections, so just looking through the Hub logs can easily make you think that something is critically wrong when actually it was just a momentary blip.
For example, your last error message regarding the T3 timeout. The cable modem in the VH hub requires constant tiny adjustments to timing and slight changes to channel frequencies etc. This is referred to as 'ranging' and every 20-30 seconds or so the Hub sends out a ranging request message back to VM's infrastructure (the CMTS). The DOCSIS specs say that it should receive a response back within a quarter of a second and if it doesn't (momentary interference, the CMTS was just a bit too busy etc), it logs a T3 error - literally no ranging response (RNG-RSP) received. It then resets its timer and tries again at the next ranging interval. Only if it misses 16 consecutive responses does it realize that something has gone wrong and it may well have lost a channel and needs to reconfigure itself.
The important thing is that see a scary looking error message but don't see the fact that after that one it was fine for days afterwards!
Just for completion, because of the way that digital information is encoded into the signal being sent down the cable, that it is vitally important that the VM hub and the CMTS remain in sync time-wise and to that end there are periodic timing signals sent to keep everything locked together. Sync Timing Synchronization failure is just that, it's (temporarily) lost its timing lock.
The hub will have been told (for example) that it should have 24 downstream channels at 256 QAM and 4 upstream at 64 QAM - sometimes because of a bit of noise, bad connection, faulty hub, it can lose a channel or have to downgrade one or more of the upstream channels to 32 or 16 QAM in an attempt to at least keep the connection up albeit with reduced performance. RCS (Receive Channel Set) partial service, as the name suggests!
Like I said, what you don't see is the hub picking itself up afterwards and working properly - so don't get too hung up on see these from time to time.
Now, of course if you have a lot of them and/or a real internet connectivity issue, then that's another matter!
Thank You for the very detailed reply I am only asking as I have recently increased our broadband to 200mb and am not really seeing any benefit. I have 5 bars from a BT extender so strong signal but on Speedtest.Net only getting between 10 to 20 mb download speed on a two year old laptop. I appreciate that there are other factors involved with wirless connections but am only sitting approximately 15 feet from router . By the way I only have one bar from router itself. Again thanks for the reply.