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. Performance sometimes improves after modem reboot, though typically no more than one upstream channel locks. This can't be true. I'm having some ongoing issues with my modem requiring frequent resets. 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. Learn more about upstream and downstream channels here. In a theorhetical sense, each upstream channel is capable of providing around 30Mbps. My upstream bandwidth supposed to be 7Mbps. Acceptable Upstream Power: 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. Speeds seem to be normal. I noticed that it only has four of the 8 upstream channels bonded. I have been having a terrible problem of upstream connection going off everyday numerous times. In my case, Comcast is running four upstream QAM channels (no upstream OFDM) at frequencies of 173MHz, 273MHz, 303MHz, and 367MHz. My ISP is comcast. I believe this is a line problem, and not a -55 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. 1. I believe these problems to be related to my 51-55 dBmv and my only one locked bonded upstream channel. As a comparison, DOCSIS 3.x modems support 128QAM upstream If it's just 1 channel that says that, you're probably fine. Only 4 channels are bonded as seen below on SB8200, getting slower upload speeds during the day. Checking the signals i found that I'm getting 16 down but only 1 up channel. I know there is one solution on the Comcast forums. 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. The upstream power is too high / out of spec on channel 1. 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 Upstream speed is only around 50KBps-70KBps. Want to know which Comcast channels are available where you live? The header in Column-3 of your log reads 64QAM. Are you Comcast in my area had some issues last month that seemed to be fixed. There's no way Comcast would cut legacy upstream bandwidth in half on sub splits systems just to have an OFDMA. After upgrading to the DPC3008, I have only 1 downstream channel and 1 upstream channel. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the unbonding of the multiple bonded 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 Does Comcast use Docsis 3.1 for upstream? You're only supposed to have 1 channel per stream. 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. Helpful thread! This has to be a firmware issue as it only happens in version 2.02 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). Download speed and upload speed are important factors when choosing the right cable modem for your needs. Since I only have internet service this is probably my issue as well. As capacity increases, the 4th one might come online. With two, your max upload capability would be around 60Mbps (rounding down), which probably far exceeds your tier. I wouldn't worry about performance with only two bonded channels. Find your channel lineup using your address here. My internet works fine, and my speed matches my tier Solved! Use … 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. All 32 downstream seem fine. Upstream channel 1 dropped by 1 dB from 51 to 50, but it is now back to 51. 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 … My modem supports 24X8 channels. This site uses cookies to enable your digital experience. Pay only $15/mo for 1 GB of shared data with our By the Gig data option. When i run a spees test I'm seeing 120d/6u. Hi, so i recently upgraded my router to make better use of the blast package i have. However, there is only one Engineer there that knows how to escalate this issue to to get the problem resolved. Channel three dropped from 50 dB to 47 dB and has stayed there. 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. 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 CM500 only one upstream channel and frequent disconnects My internet connection has been having frequent outages for a while now. Is the number of channels available dependent on my 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 … 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. Comcast NBCUniversal creates incredible technology and entertainment that connects millions of people to the moments and experiences that matter most. Re: CM500 Only Displaying One Upstream Channel Besure there are not coax cable line splitters between the modem and ISP service box. I have the same issue, Only ONE downstream channel being used and no DOCSIS 3.1 on upstream. So basically I have a "24x4" modem router. 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. Today I noticed that I no longer have 4 upstream channels but only 1. 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 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. But with a Netgear CM1100. And it is not his job to do so. 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 Forum discussion: Hello all, After recent issues I upgraded from a SB6141 to a MB8600. The other half (5-8) won't lock. The upstream channels, however, only half of them lock (channels 1-4). Only DOCSIS 2 modems support 64QAM (modulation). Enjoy Internet + Mobile Plus save data with millions of secure Xfinity WiFi hotspots nationwide. ( channels 1-4 ) speed are important factors when choosing the right cable for... Some issues last month that seemed to be related to my 51-55 dBmv and my matches. Systems just to have an OFDMA but it is now back to 51 4th one might come online by! That knows how to escalate this issue to to get the problem resolved n't worry about performance only! 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