@nugpot I would install downstream attenuators at the modem. What that will do is keep the signal levels high until it hits the attenuators. After the attenuators, the downstream signal level will drop to a normal level, near 0 dBmV. Installing them at the modem will ensure that any noise that is picked up, inside the house, will drop before it hits the modem. The cable shield will normally shunt any noise to ground, but, in cases of high noise levels imparted to the cable, along its path to the modem, the center copper conductor can be subjected to external noise. So, dropping that noise by 9 dB, just before the modem would be the preferred action to take.
You could try calling tech support to see if they can arrange for a tech to drop off a couple of attenuators. I think that would be hit and miss. I've seen reports of downstream attenuators installed by Rogers techs, but, I don't know if that means a contact tech, or a real Rogers tech or if it means that the tech actually had the correct Forward Path Attenuators on hand. If you happen to come across a Rogers tech during your daily travels, stop and ask him or her if they have a 6 dB and 3 dB Forward Path Attenuator in the van. You need both attenuators to drop the downstream signal level. You never know, you might be lucky and receive both attenuators. Nothing ventured, nothing gained as they say.
I would still discount the use of an splitter to accomplish the same objective as it would push the upstream signal levels near the modem's failure point.
Yup, there are a small amount of Uncorrectable Codewords present. They're a very small percentage compared to the Unerrored Codewords. The problem here is that Rogers has been completely silent on the data split between the QAM channels (1 to 32) and the OFDM channel (33) which runs thousands of data sub-carriers. There is a chance that the QAM data is completely irrelevant, both in terms of the Unerrored Codewords and the Uncorrectable Codewords. If we had a good idea of that data split, we'd be able to tell you if the QAM channels were really relevant the modem's operation.
The only people who have access to the internal OFDM channel data are the moderators, the Level II techs and the field techs, although I'm not convinced that the contract techs have access to that data or know what to do with it.
The specific attenuators that I pointed out can't be purchased in Canada. There might be a Taiwanese version around these days, but I haven't looked recently. Rogers uses, for the most part, Sub Split Docsis, which means that the upstream channels are running in the 5 to 42 Mhz range, and the upstream is running in the 108 (?) to 1002 Mhz range. The lower 108 Mhz might be set to somewhere around 200 Mhz. The next increase in Docsis frequencies is Mid-Split, which runs the upstream channels in the 5 to 85 Mhz range, and runs the downstream in the 200 or 300 Mhz range up to 1218 Mhz.
The attenuators that pointed out are rated to run the upstream channels in the 5 to 85 Mhz range and the downstream in the 300 to 1218 Mhz range. So, they're ready to support the next generation mid-spit channel ranges.
I've seen posts indicating that Rogers has already employed mid-split channel configurations in some locations, so Rogers is more than ready to switch to that configuration. I suspect that it will take a while to accomplish this due to the changes in equipment that will be necessary to run mid-split configurations.
The typical attenuator that you buy these days only runs 5 to 42 Mhz for the upstream channels and 200/300 Mhz to 1002 Mhz for the downstream channels. So, if you do buy attenuators that fit this description, at some point in time you'll cut off part of the upstream channel range, and potentially the upper 1002 to 1218 frequency band for the downstream channels.
Buying a typical set of Forward Path Attenuators would probably suffice today, but, at some point in the future, they will cause problems due to the frequency mismatch between the Attenuator and Operational frequencies. If you go down this path, this is something that you will have to keep in mind. I'm simply advising buying a set of attenuators that will be suitable for today and sometime tomorrow.
I would hope that the attenuators that Rogers techs might have on hand are designed for mid-split operations. I believe that the Antronix splitters that Rogers uses these days are suitable for mid-split ops, so, it would make some sense that the Forward Path Attenuators are as well.
Good morning @RetSgtFlegg!
When you lose connection, does the light pattern on your modem change? How long are you losing connection for? Are you losing connection on both WiFi and Ethernet simultaneously?
If you have any test results from tests that you've run that show this issue happening, please paste them here so we can review them.
Regards,
RogersCorey
-
51180 views
-
21 Likes
-
-
