My internet works fine, and my speed matches my tier Solved! Support tech on the phone said there are only 2 channels on the entire Comcast network, and both channels are bi-directional, upstream and downstream. Enjoy Internet + Mobile Plus save data with millions of secure Xfinity WiFi hotspots nationwide. Picture of connection details For background we're in a townhouse connected directly to the line pole, there's one Comcast installed splitter in the basement immediately where the line comes in, that's run up through the house to the modem in the … A user forum on DSLReports shows increased activity in the last month around upstream channel bonding in several Comcast (Nasdaq: CMCSA) markets.While downstream channel bonding for higher download speeds has been a Comcast priority for years now, upstream bonding has remained largely on the back burner. Re: CM500 Only Displaying One Upstream Channel Besure there are not coax cable line splitters between the modem and ISP service box. Only DOCSIS 2 modems support 64QAM (modulation). All 32 downstream seem fine. In the Upstream Bonded Channels section, identify the number of Channels, Type, Symbolic Rate to find verify Upstream Power levels are within the acceptable range for each upstream channel. With two, your max upload capability would be around 60Mbps (rounding down), which probably far exceeds your tier. I noticed that it only has four of the 8 upstream channels bonded. To illustrate, D3 spectrum spans 108 MHz – 1.002 GHz downstream and 5 MHz – 85 MHz upstream while D2 ranges between 88 MHz – 860 MHz down and 5 MHz to 42 MHz up. The upstream power is too high / out of spec on channel 1. I have the same issue, Only ONE downstream channel being used and no DOCSIS 3.1 on upstream. The other half (5-8) won't lock. The upstream channels, however, only half of them lock (channels 1-4). Only 1 upstream channel - and power out of spec but "all fine on our end, no engineer for you" ‎24-04-2020 17:51 - edited ‎24-04-2020 17:55 Just got off the phone with the call center, factory reset Super Hub and still only the one upstream channel, and 20 Mbps up instead of … I have been having a terrible problem of upstream connection going off everyday numerous times. The header in Column-3 of your log reads 64QAM. Helpful thread! I believe these problems to be related to my 51-55 dBmv and my only one locked bonded upstream channel. Comcast in my area had some issues last month that seemed to be fixed. I'm getting a green light for up and blue light for down on the modem. The upstream throughput possible is 30.72 Mbit/s per 6.4 MHz channel (approximately 27 Mbit/s after overhead), or 10.24 Mbit/s per 3.2 MHz channel (approximately 9 Mbit/s after overhead). Upstream speed is only around 50KBps-70KBps. Channel three dropped from 50 dB to 47 dB and has stayed there. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the unbonding of the multiple bonded Use … I'm experiencing extremely slow upstream speed from my local server (using Comcast business class internet) to server in either Montreal, Canada or Terre Haute, Indiana. Comcast Founded: 1983 Headquarters: One Comcast Center, Philadelphia, PA 19103 Employees: 10,000+ Customer Service: 1 (800) 934-6489 Website: Go to Website Wikipedia: Go to Wikipedia Facebook: Go to Facebook DOCSIS 3.0 or 3.1 cable modems have the ability to support more channels, therefore offering the best opportunity for high-speed Internet bandwidth speeds. News: For some time, DOCSIS 3.0 cable broadband tiers have been a little topheavy, with downstream speeds that far out-weigh their upstream counterparts. Find your channel lineup using your address here. Speeds seem to be normal. Does Comcast use Docsis 3.1 for upstream? Learn more about upstream and downstream channels here. I'm having some ongoing issues with my modem requiring frequent resets. Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked QAM256 28 537000000 Hz 3.0 dBmV 39.1 dB 3152131365 0 0 If it's just 1 channel that says that, you're probably fine. After upgrading to the DPC3008, I have only 1 downstream channel and 1 upstream channel. Download speed and upload speed are important factors when choosing the right cable modem for your needs. Is the number of channels available dependent on my This has to be a firmware issue as it only happens in version 2.02 But with a Netgear CM1100. Forum discussion: Hello all, After recent issues I upgraded from a SB6141 to a MB8600. My upstream bandwidth supposed to be 7Mbps. CM500 only one upstream channel and frequent disconnects My internet connection has been having frequent outages for a while now. In a theorhetical sense, each upstream channel is capable of providing around 30Mbps. In my case, Comcast is running four upstream QAM channels (no upstream OFDM) at frequencies of 173MHz, 273MHz, 303MHz, and 367MHz. If you’re a tech geek, you’d be interested to know that D3 supports quadrature amplitude modulation ( QAM )128 for upstream traffic; D2 supports only QAM 64. Since I only have internet service this is probably my issue as well. And it is not his job to do so. My ISP is comcast. I wouldn't worry about performance with only two bonded channels. So not only are they asking the CM1150V do do something it was never designed to do, they are blatantly violating the DOCSIS 3.1 … The Netgear can bond up to 4 upstream channels, but many Comcast areas are only enabling 3. I believe this is a line problem, and not a -55 As capacity increases, the 4th one might come online. Checking the signals i found that I'm getting 16 down but only 1 up channel. 1. As a comparison, DOCSIS 3.x modems support 128QAM upstream Are you Comcast NBCUniversal creates incredible technology and entertainment that connects millions of people to the moments and experiences that matter most. Today I noticed that I no longer have 4 upstream channels but only 1. When i run a spees test I'm seeing 120d/6u. Pay only $15/mo for 1 GB of shared data with our By the Gig data option. DOCSIS 3.1 supports a downstream throughput with 4096-QAM and 25 kHz subcarrier spacing of up to 1.89 Gbit/s per 192 MHz OFDM channel. However, there is only one Engineer there that knows how to escalate this issue to to get the problem resolved. Upstream channel 1 dropped by 1 dB from 51 to 50, but it is now back to 51. Acceptable Upstream Power: This can't be true. This site uses cookies to enable your digital experience. Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 5 549000000 Hz 4.8 dBmV 41.3 dB 0 0 2 Locked QAM256 2 531000000 Hz 4.5 dBmV 41.1 dB 0 0 3 Only 4 channels are bonded as seen below on SB8200, getting slower upload speeds during the day. Performance sometimes improves after modem reboot, though typically no more than one upstream channel locks. My modem supports 24X8 channels. Hi, so i recently upgraded my router to make better use of the blast package i have. I know there is one solution on the Comcast forums. I noticed the upstream light on my modem was solid amber and after looking at how to fix that I saw recommendations to look at the cable connection and event logs of the modem. There's no way Comcast would cut legacy upstream bandwidth in half on sub splits systems just to have an OFDMA. You're only supposed to have 1 channel per stream. Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables UnCorrectables 1 Locked QAM 256 33 357000000 Hz 2.7 dBmV 38.9 dB 9 25 2 Locked QAM 256 34 363000000 Hz 2.7 dBmV 40.3 dB 15 Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB) 1 693000000 256QAM 4.700 47 40.946 2 363000000 256QAM 1.200 10 40.946 3 369000000 256QAM 1.500 11 40.946 4 375000000 So basically I have a "24x4" modem router. Want to know which Comcast channels are available where you live? 192 MHz OFDM channel log reads 64QAM to 4 upstream channels, however, there only. Issue as well log reads 64QAM a spees test i 'm having some ongoing issues with modem! You 're probably fine dB to 47 dB and has stayed there modem for your needs enable digital!, there is only one locked bonded upstream channel to do so capability be! Have an OFDMA pay only $ 15/mo for 1 GB of shared with... 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