Quote:
Originally Posted by Sephiroth
Is an attenuator fitted?
As has been pointed out, 51 is the upper upstream power limit and the system will continue to work until/unless the VM can't read what is sent at 51. In that case, after a number of retries, the modem will soft reset. This would show in the logs as a succession of T3 error followed by a T4 event, which is the reset. I'm assuming that the firmware still reports this stuff.
Your short outages are events caused by downstream issues. If the Post-RS error rate is rising from hour to hour (or indeed minute to minute), then you have data corruption coming into the modem. As this is sporadic, it's unlikely to be the modem itself. It could be anywhere (like a tired laser at the optical node in the street). The key to finding out more is to ask your neighbours if it's happening to them. If so, then it's an area fault; if not then it may be anything from the local cabinet tap point to the drop point at your home.
So thr ate at which Post-RS errors are occurring is the next diagnostic needed.
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Thanks Seph. They only increment up when the issue is occurring, otherwise they stay the same. For example I copy and pasted that table yesterday and the numbers were the same this morning following no issues. TBB graph completely clean normally and I get full speed, so most of the time I forget about the power levels etc.
Over the past few months I havent kept a close eye on it so will keep looking but am reluctant to spend too much time on it if I can't get through to a VM engineer at a suitable level to have a sensible discussion on the phone and they understand basic networking concepts.
Will chat with one of our neighbours and report back. Really appreciate your advice by the way!
EDIT: No attenuator fitted