
OFDM | Cox Community
Do you mean upstream OFDMA or downstream OFDM? I thought most areas had at least 1 downstream OFDM channel to be compatible with DOCSIS 3.1 and 940Mbps (AKA Go Super Fast) speed tier.
Weird issue with OFDM channel causing disconnects
From what I understand, you want to see a lot of correctable errors on the OFDM channel because that means it's running at its maximum possible speed. When you start seeing uncorrectable errors, that's when you should worry. I think the messages you're seeing are just the modem shuffling around OFDM profiles for maximum performance.
List of all CM-STATUS event type codes with explanations
The Next Codeword Pointer (NCP) is a portion of the downstream OFDM channel which is dedicated to carry information about the mapping of FEC codewords to subcarriers within a symbol. NCP is generally considered a part of the Downstream Convergence Layer. [DOCSIS PHYv3.1] includes a detailed description of the NCP.
OFDM PLC errors on MB8600. on Firmware 8600-19.3.15.
Only Channel 33 is an issue which is OFDM PLC. All other channels have no correctable or uncorrectable errors in the last 24 hours. There are about 43 0million correctable errors on Channel 33 in the last 36 hours, no uncorrectable errors. They climb at an astonishing rate. As you may be able to tell, signal is 10.8 dBmV, SNR is 45.1.
Upstream OFDM is coming | Cox Community - Cox Support Forums
Basically upstream OFDM is being enabled in some areas along with a extra downstream OFDM channel. No new upstream speeds have been announced but I predict they are coming. Seems if you have 8 upstream channels you are close to an upgrade.
OFDM Channel not locked - Downstream light consistently …
dave9 would be the best source but I think the OFDM(A) channels are your overall circuits. These circuits are then divided into separate channels: 32 and 4. Therefore the overall circuits wouldn't be individually locked. I could be wrong and sure I am.
Solved Consider an OFDM system. Assume that the total number
Question: Consider an OFDM system. Assume that the total number of samples for DFT and IDFT is 2. The total number of sub carriers is 2. One sample of cyclic prefix is added to each OFDM symbol. Each packet consists of one OFDM symbol for channel estimation followed by one or more OFDM symbols for data transmission.
Continuous event code 16 OFDM Profile Failure | Cox Community
2024年6月19日 · But event log shows continuous type 16 FEC errors with around 1 - 2 min intervals. OFDM/OFDMA Profile ID ...
OFDM channels required for Gigablast? | Cox Community
I just signed up for Gigablast and I was checking speeds. I checked my modem page on my CM1000 and I'm not seeing any OFDM channels locked. I'm seeing ~340 mbps max download speeds when doing a controlled test from my laptop wired directly into the modem. On averaging it's usually about about 300 mbps-310mbps.
More info about CM-STATUS messages in log | Cox Community
If you're seeing CM-STATUS Event Type Code 16 messages in your modem logs, based on the paper I've linked below it looks like those messages indicate noise on the OFDM channel. When you see CM-STATUS Event Type Code 24, that means the noise has cleared up.