By subdividing the channel, parallel transmissions of small frames to multiple users happen simultaneously. OFDMA subdivides a channel into smaller frequency allocations called resource units (RUs). ; The first 2 checked wiring etc which is a fine. Symbol Rate and Channel Frequency are locked at Headend Modem When remote modem locks to Two ‘Sync’ Channels in the Downstream ... Downstream and Upstream Carriers Locked at Headend ... All OFDMA carriers are transmitted at the same level from remote (i.e. Online gaming is becoming unplayable. Upstream OFDMA Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked 0 0 0 Hz 0 dBmV 2 Not Locked 0 0 0 Hz 0 dBmV-----Time Priority Description Sun Oct 25 16:36:19 2020 Notice (6) CM-STATUS message sent. Helpful thread! out of my modem's 32 channels?!? I've had 3 engineers out over the last 6 months. Since I only have internet service this is probably my issue as well. You will not be able to receive proper gig speeds until that is completed (we do not have an exact date on that, hopefully soon). My internet works fine, and my speed matches my tier (250 Mbps). I'm seeing ~340 mbps max download speeds when doing a controlled test from my laptop wired directly into the modem. Downstream Channels. I just signed up for Gigablast and I was checking speeds. The current levels provided by Comcast are 38 - 42 across the 4-upstream channels. Mine shows all 32 downstream channels being used now. Call Spectrum and request a technician for signal issues. 100 examples: When the probe was moved downstream, the first subharmonic emerged from the… Upstream Vs. An upstream V is formed by an obstruction in the water that creates a V that points upstream. Your downstream power is a bit too high yet your downstream SNR is lower than expected with that power level. This means your modem found the frequency with which to receive information from the internet. However, I am having an issue with downstream channel bonding. I was told the Docsis 3.1 frequencies are above 677Mhz. Great infromation, thanks! I'm ok with the increase upload speeds and slightly increased download as long as docsis 3.1 is in the works. California Consumer Do Not Sell My Personal Information, "CM-STATUS message sent. Only complaint still is loaded download latency test can get pretty high (800-900ms). A loss of FEC lock on one of the assigned downstream OFDM profiles of a channel. Event Type Code: 1; Chan ID: 33 ; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A. Here's the original images posted on google drive: https://drive.google.com/open?id=1R5laC1mY75xh2smkRolkDtv2DbeJAdss, https://drive.google.com/open?id=1Roewa-j2xNcV-sDae2YC0rVip0eoMImd. Generating in-channel and out-of-channel upstream and downstream DOCSIS 3.1 signals. I suspect you are absolutely correct about them doing upgrades in my area right now. I would expect to see SNR of 43-45dB with a 9-10dB power level. I have the Netgear CM1150v Docsis 3.1 cable modem telephony and am curious about the downstream channels. Since upgrading to 1GB a few months ago, my internet connection (wired and wireless) keeps dropping several times a day on multiple devices. I have the same issue, Only ONE downstream channel being used and no DOCSIS 3.1 on upstream. Move CM’s service flows back to original BG. Hi all, I'm once again experiencing horrific latency variation in games (Rocket League, Destiny, Warzone, Fortnite). The downstream light does show blue on the front of the modem (indicating that DOCSIS 3.1 is being used for downstream). When I lost DOCSIS 3.1, dl speeds decreased 30-40%. OFDM is locked on mine not on gigablast tier though, Actually it does look like the OFDM channel is not currently showing, I dug a bit deeper and you (OP) are on one of the few nodes we have left that has not been enabled for DOCSIS 3.1. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 . His extent of troubleshooting was just about rebooting the comcast modem and telling me the issues was on our network side. The modem used to bond to all 4 channels, now it only bonds to 2 channels. I would definitely call them. Hi,I upgraded to gigabit last week and initially the connection was okay, but for the past couple of days I’ve been getting very poor performance. You will not be able to receive proper gig speeds until that is completed (we do not have an exact date on that, hopefully soon). Once the water had receded, the extent of the damage became clear. Acquire Downstream Channel: This should say "Locked", "OK" or similar. Pretty sure OP should have OFDM channel locked. Yep. I checked my modem page on my CM1000 and I'm not seeing any OFDM channels locked. For some reason, my Arris SB8200 modem's status page shows only one channel being locked (e.g. used?) FEC lock recovery. Need The Option to Unmark Accepted Answers If Solutions Don't Work. Can you see it on your(Cox) side? 16. I did notice downstream light went to green (no DOCSIS 3.1 anymore) last night after my last post. This system uses an injection‐locking technique to enhance the usable bandwidth by making stable channel states. Also, I've got a … DS OFDM profile failure. If the user wants to utilize non-best effort flows, it is recommended to bond the OFDMA channel with one or more ATDMA channels. Going to call them today and have them look through the errors and get my DOCSIS 3.1 blue light back. Tried it today though and got 101ms on fast.com. So basically I have a "24x4" modem router. used?) Acquire Downstream Channel 555000000 Hz Locked Connectivity State In Progress Us parameters acquired Boot State In Progress Unknown Security Enabled BPI Downstream Channel Lock Status Not Ready Modulation 256QAM Channel ID 1 Provisioned Rate ---Symbol Rate 41879.195 Ksym/sec Downstream Power -1.0 dBmV SNR 39.0 dB Upstream Channel But with a Netgear CM1100. If you want to get involved, click one of these buttons! Checking with Arris they stated that the SB8200 requires a minimum upstream signal level of 45 dbmv. Download speed and upload speed are important factors when choosing the right cable modem for your needs. 4G is the fourth generation of broadband cellular network technology, succeeding 3G, and preceding 5G.A 4G system must provide capabilities defined by ITU in IMT Advanced.Potential and current applications include amended mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing, and 3D television.. Interestingly, upstream light is green (indicating DOCSIS 3.0 for upstream/send)? The first-release Long Term … Actually it does look like the OFDM channel is not currently showing, I dug a bit deeper and you (OP) are on one of the few nodes we have left that has not been enabled for DOCSIS 3.1. Below is the status page from my modem. Interestingly, upstream light is green (indicating DOCSIS 3.0 for upstream/send)? 1 Locked 0, 255 159 690000000 Hz 6.5 dBmV 39.5 dB 1366 ~ 2729 1192634081 903871793 0 2 Not Locked 0, 255 0 0 Hz 4.9 dBmV 0.0 dB 0 ~ 4095 0 0 0 Upstream OFDMA Channels NCP profile failure. The other half (5-8) won't lock. • DOCSIS 3.0 Data rate up to 320 Mbps with 8 upstream channel bonding • DOCSIS 3.1 Modulation: Multi-carrier OFDMA BPSK to 4096QAM • DOCSIS 3.1 Data rate Up to 700Mbps with 1 OFDMA 80MHz upstream channels • Frequency: 5-85 MHz • Upstream transmit Signal Level: +11 to 65 dBmV • Output return loss: >6dB DS OFDM Profile Manager will handle this event and take action. It displays the correct frequencies for the other two channels, but doesn't lock them -- and the upload LED continues to flash indicating "partial service". Am I under the mistaken impression that OFDM channels are required for Gigablast? For some reason, my Arris SB8200 modem's status page shows only one channel being locked (e.g. Upload speeds of 35mbps seem fairly consistent. 3 Agenda . NCP) indicates to the DOCSIS 3.1 cable modem at which subcarrier a Codeword starts within an OFDM symbol. The modem indicates 3.1 / blue on the downstream but the upstream is showing 3.0 / green. 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