Between Saturday 26 June and Sunday 27 June I carried out the following test: I moved the cable modem to the cellar and plugged it directly in to Eltrona's coaxial splitter, with a piece of coax with plugs fixed by Eltrona at the time when the first installation was made. (The WiFI function of the cable modem is useless in the cellar, that' why I wanted it to be installed in my office on the 1st floor.)
The logic behind this exercise of evidence based decision making was as follows: If there are no interruptions while the modem is in the cellar, the problem is either my 75 ohm RG-6U cable or the connectors I had screwed to the two ends of the cable. If, however, interruptions still appeared while the modem was in the cellar, then changing the cable and fittings would be of no use.
After the installation, the signal levels looked even better than upstairs in a stable situation. The downstream signal was amplified by 5 dBmV, and 42 dBmV was the sufficient signal level to communicate upstream. On the other hand, in the stable functioning of the connection, the +/-0 dBmVa and 46 dBmV seem to be sufficient. Signal to noise ration did not improve from 34/35 dB.
After checking the logs in the next morning, the same old T3's were there: From 1.30 to 1.40 Luxembourgish time, the service was down again.
* Saturday - Sunday 26/27 June 2010
The conclusion is that changing the cable and connectors will not solve the problems. Either the disturbances come from the cable modem (which I doubt) or they come from Eltrona's side of the network.
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