Originally Posted by spiderplant

The power level is the signal strength from the cable into the hub. It should be between -6 and +10 when it is installed. (This does include some margin for signals varying over time, so your signals might drift outside this range but not actually cause a problem).

RS is Reed-Solomon forward error correction. Some extra check bits are appended to each data packet that's transmitted so that if the packet is slightly corrupted by noise on the network, the errors can be corrected (that's known as a correctable error). If the corruption is more severe, it won't be possible to correct the errors, but the receiver will still know that the data was incorrect, so it can discard the packet entirely (an uncorrectable error).

When an uncorrectable error happens on broadband, the high-level protocols generally detect that a packet has been lost, and requests its retranmission, but this takes time so slows down your data transfer. If an uncorrectable error happens on broadcast TV, there is no way to request retransmission, so parts of the picture are simply missed - usually it pixellates.

Originally Posted by General Maximus

In your downstream table you have got pre-rs errors and post-rs errors. The pre errors are the bits of dats that arrive to you corrupted before they have had a chance to be fixed. The post errors are the one that have tried and cannot be fixed and these are the ones you need to worry about because it is lost data. Traditionally when there is problem with a particular channel you'll see 0 post rs errors down the list and then a few hundred or thousand on one channel but you have got a ridiculous amount across the board which just doesn't happen unless there was a major problem higher up the network and if that was the case VM would have picked up on it by now. That is why I believe the problem is more your end.