Comcast upstream power level too high

Comcast upstream power level too high. To view the upstream and downstream power levels: Launch a web browser from a computer or mobile device that is Jul 15, 2018 · 125,640. However, the modem is the only thing active. . When I have all 3 devices connected, my power levels are at 0dBmV (perfect score) and my upstream power levels are around 46-48dBmV. This tells me that the signal level is too low for the modem to connect to a bonded upstream channel. Jul 18, 2015 · Downstream power level should be no more than +/- 5 dBmV, according to the comcast tech who just came out to fix my signal. A quick way to lower the hot signals we would throw a splitter in line. My modem is a fairly new Cisco DPC3008. -15 dBmV & +15 dBmV "Maximum". But occasionally, it just decides to drop to 0. Experience optimal network performance with Wi-Fi 6. Jul 22, 2020 · The upstream power is way too high / out of spec. I am using an HDHomerun Prime with a comcast cable card and a Motorola SB6580 Modem/Router. Gets you 3. I'd get a tech out to go over everything. 5000 dBmV (Again this isn't really a truck roll thing as it doesn't do it all the time, seems to be more frequent when it's really warm outside, like today. Jul 19, 2020 · The upstream power at 48 dB is o/k as long as it doesn't fluctuate higher. 0 and 41. If your power levels are too high for a given connections maximum it will be changed to another connection type to compensate which can result in speed problems. Upstream Power Level: +25dBmV to +54dBmV. Downstream Power refers to the line signal sent from the cable provider to cable modem. 0000 dBmV, 48. My downstream is -21 and upstream is 54. May need that back on. I was at +12, which was way too high and was causing random disconnects Upstream: +45 dBmV to +51 dBmV Here are my downstream levels to get that out of the way: Here are my upstream levels: I do have this splitter on my coax going into the modem (see below). Today, I removed the splitter in the attic that splits the coax to my TV The event log for my modem is full of T3 timeouts as well as other "critical" notes that appear to be related to high power levels. The coax running to the modem is completely unbroken from outside my house; I can follow the line all the way from Comcast's equipment outside straight to my modem, it doesn't even have a break for a wall port. I'm really quite solid with tech and I'm very computer saavy but I don't know much about broadband servicing and I'd really appreciate any help with what needs to Nov 3, 2021 · The upstream power levels are controlled automatically and continuously by Comcast's equipment and do not need to be above 45 dBmV. <tabindex=-1>Upstream Bonded Channels (Partial Service)</tabindex=-1>. Sep 26, 2020 · Comcast's signal specs are the ones posted in the Connection Troubleshooting Tips Forum article, which says the Upstream Power Level at the modem should be between +35 dBmV and +50 dBmV. And sometimes my upstream will only lock 1 or 2 of my channels. This just tells me that the modem is not the issue May 16, 2006 · Hi. 5 to 7 db drop. 8 & 56. For the past year, my Downstream power level has been +3dbmv and with a SNR of 41db, and the upstream power was +41dbmv. The upstream is 13db but that may be more that the cable company equipment can't tell the modem to go any higher. 8 dBmV with the recommended range being under -10 to 10). If your internet connection keeps disconnecting, the problem could be a high upstream power level. Note: Not all modems will allow you to view the status page and some will have different URLs to access this info. Jul 15, 2018. 1. 5000 dBmV, 49. a. OK so for upstream you modem is putting out 30dB. 0 cable modem that I will plug in when this issue occurs, which gives me back my internet. It won't affect the upstream power; https://www. Downstream signals range from from +4. This is the power level that the CMTS has instructed the cable modem to transmit at in order for the modem's signal to be received by CMTS with a power of 0 dBmV . Again, they are the only ones that really matter; Downstream Power Levels: -8dBmV to +10dBmV. Can Xfinity increase these levels remotely or does a technician have to come out? Mar 27, 2023 · The upstream power levels are controlled automatically and continuously by Comcast's equipment and do not need to be above 45 dBmV. Think of it as 2 way conversation. But all 4 upstream channels I have 34 at the most; consistently. Comcast generally only bonds to 3 channel upstream so you're fine there. Yes. You reset, your upstream power level is normal, noise causes it to slowly rise, you end up offline, and the cycle repeats. Internet Access: Good. I did discover that the coax cable is damaged (the end going into my router which is a CAX80) I know its a pain to try and get a tech out here to adjust my line and they'll just blame it on my router but its hardly 6 months old. High downstream doesn't become an issue until you start to get above like 17. 8 dB 0 0. That is correct. Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. Logs show "No Ranging Response… Jan 22, 2023 · High Upstream Power Levels. 1dB on all 32 channels. The upstream power is too high / out of spec. 4 dBmV 39. In this case the cable company will install a special high-pass filter that filters out the upstream noise, and in doing so causes the modem to transmit at a higher signal level. -2dBmV. DOCSIS 3. 1 modems cannot. Speed test from the router itself only clocks about half the bandwidth I'm paying for. If you want to min/max then get a 6dB attenuator. The spikes in power levels don't seem to always coincide with connection disruptions. Channel. If your upstream power is too high, that can cause issues and interfere with your connection. In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable Mar 27, 2002 · Look, currently, between 4 PM and 5 PM today, my SB6120 cable modem 192. That is low. 3. Something else is going on. Downstream Signal to Noise Ratio (SNR): >35dB. Upstream Receive Power. Ideal downstream levels are between +8 and -8, with upstream no higher than 50-52, better in the mid 40's. 1 QAM256 555000000 Hz 13. Jan 15, 2021 · These are the Comcast system / cable plant spec from the troubleshooting tips sticky topic at the top of this board. Comcast tech support is saying they cannot adjust these values. Mar 31, 2022 · My router (Netgear Nighthawk CAX80)'s diagnostic is reporting that my downstream connection's power level is poor (13. I had a tech out today, and he indicated that I had a Dec 11, 2020 · A signal that is too strong can cause problems as well but is easily fixed with a splitter or an attenuator. Are there any splitters between the cable entry point and the modem? Yes a two way splitter which leads to a four way splitter for a total of 5 connections in the house. Don't apply a splitters your Downstream levels and Upstream levels are fine. Your downstream levels are out of spec. See modem stats after a reboot earlier today. I noticed my initial upstream power levels were pretty good, mid 40s. I have found that the maximum upstream power is 51dB (like it used to be all along) before customers start having connectivity problems. k. Jan 17, 2009 · The Downstream Power Level reading is a snapshot taken at the time this page was requested. In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the The three signal levels that need to be within the acceptable level are Downstream Power Level, SNR (Signal to Noise Ratio), and Upstream Power Level. Also you have quite a few uncorrectable errors going on so I would suggest calling in. After installing a 2-way -3. 0 (All Modulations) 54 dBmV maximum for 32 QAM and 64 QAM. Upstream Modem Stats. How can I get this adjusted by xfinity? Archived post. If you have a splitter in your chain of wiring that can be removed that will increase it to the correct level. NOW after being out all day, the downstream power is between +10 and +12dbmv with a SNR of 46db (which is way too high power), and the upstream power being sent from the modem is 47dbmv. The G36 provides Wi-Fi speeds up to 3000 Mbps for gaming, streaming, or working at top speeds. The level of the downstream power should be -15 to 15 dB Nov 17, 2021 · Action: [Upstream Power Level] Try these actions (Click the Refresh button after each step): 1) Make sure the coaxial cable is tightly connected. The upstream power is too high / out of spec and the downstream power is too low / out of spec. You also have relatively excessice correctable and uncorrectable errors on channels 6 through 8 and this points to the modem. Upstream Power Historical Stats Jan 14, 2021 · 3 years ago. The problem is that there doesn't seem to be a good ideal balance between downstream power and upstream power anymore without being on the very edge. 4) Contact your service provider for troubleshooting help. I have no idea how get this issue resolved. Specification Min Max. Dec 20, 2022 · He told me that I was correct, my upstream power levels are too low, in the red (all below 35) and actually my downstream power levels were "in the yellow", in the 8's and 9's. I know they are high because the spliter that my house connects to has eight spots where each house connects to Comcast's service, and the levels of the splitter are quite high because of the distance from the Sep 16, 2023 · Upstream Power: The lower the number the better (within reason). Oddly enough, today the speeds are back to normal. Jun 24, 2003 · So, then high levels are good for the SNR. Downstream SNR (Signal to Noise Ratio): cable signal being sent in relation to the noise on the line. Interestingly my modem also is only bonding to one upstream channel, the other 3 aren't locked. 2 Gbps. Here are I got a new Xfinity approved Netgear 32*8 modem and activated it using xfinity app. 7db total. Your upstream power level is too high for one. 120 Msym/sec Power Level: 57 dBmV Upstream Modulation [3] QPSK [3 Those upstream power levels are way too high. 1 dBmV 39. I think the splitter was on there exactly for that reason. Dec 6, 2016 · Downstream and upstream power levels are important when determining if the cable line that is connected to your cable modem or modem router is receiving sufficient power. In an effort to try to obtain better connectivity / more wiggle room, check to see if there are Oct 21, 2009 · Power Level: -7 dBmV -5 dBmV -6 dBmV -5 dBmV Upstream Channel ID 2 Frequency: 32000000 Hz Ranging Service ID: 2782 Symbol Rate: 5. Feb 1, 2022 · EG. The SNR looks fine for whatever that is worth Again this is if I'm looking at it correctly. +2dBmV. My upstream power levels on my netgear modem router are all above 50 and causing loss of internet. As long as modem upstream power is not maxed out, what's important is not the level at the modem, it's the level (and quality) of the modem's signal as received at Comcast. They seem to increase every day. I would look for splitters in the cable first. If the SNR goes below 30 than you will probably start to experience some problems, such as intermittent connection, packet loss, etc. 8 dBmV, #5 at 3,620,000. Power Level is between 0-2dB and SNR 38dB. Expect to see upstream power levels between 35 dBmV and 48 dBmV, which is 'normal'. I've tracked the cabling from my router, to the wall, to where the cable comes in Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. You could knock it down by using a forward path only attenuator. I've read that a good downstream power level is between -7 to +7 dBmV and a good upstream is between 38-48 dBmV. Feb 20, 2020 · On the modem status it shows that the downstream levels are with in specs but the upstream power values are 30, 31,34,30,29, I called Arris support and I was told that these need to be between 45 and 51. The downstream is indeed high. In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded If there's too much attenuation between the cable modem and the cmts, the cable modem upstream power will be very high (57-58-59 dBmV) and the rx level at the cmts can drop to -6 dBmV before the These levels express how much power the modem is using to push a signal back to the headend. The downstream power is decreasing a lot. This is a very common issue and is generally caused by wiring configurations or defective wiring and/or splitters. 3) Replace any required splitters. The most important number is usually signal to noise (SNR) which should be > 30 dB. I've had Comcast techs over the phone tell me, that my upstream power level of 55 dBmV is too high for my Motorola SB5100 cable modem. Aug 14, 2015 · While my values are likely considered "within spec" per Comcast I really would like to reduce the upstream power levels to provide a little headroom. 1 shows that the downstream power level is -9dBmV and SNR is 36dB, and the upstream power level is 53 dBmV. For all modems: -10 dBmV to +10 dBmV "Recommended". 5 dbmv where it was 41, again a difference of 10 dbmv. Two 2-way splitters would be -7db starting off with +2 to +5 @ the tap , add in 50-150ft Interestingly, I have a 10 year old docsis 3. This should be within a certain range, too high or too low can cause connection problems. . -11 dBmV to -14 dBmV / +11 dBmV to +14 dBmV "Acceptable". Your OFDM frequency has a lot of correcteds which may imply an issue, but it shouldn't be causing frequent service drops and total loss of service. According to Arris official, The power for the upload needs to be in the 45-50+ dBmV range depending. Return Signal) level: This is the amount of signal transmitted by the modem to reach the receiver in the cable company head-end. Nov 17, 2012 · Tighten every F-Connector you see. He stated that a higher level technician needs to come out and I am getting frequent lag spikes and days where my internet just simply doesn't work and I have to restart it a few time. 560 Msym/sec Power Level 57 dBmV Upstream Modulation [3] QPSK [3] 64QAM. I have an Arris S33 modem and I have been having it time-out and disconnect every night. When they left, the internet was near perfect. I haven't had any connection issues and would like to prevent losing my internet and having to call Comcast, a company that thinks a 3 day wait for a technician is acceptable, but I don't want to get charged because "I see nothing wrong here. 40dB is much stronger, 50 dB is loud, shouting, screaming. Any attenuation or splitters etc Downstream (Rx) Receive Power Level: This is the amount of signal received by the modem from the transmitter in the cable company head-end. about 18. 0 modem can handle higher thresholds of upstream power that the 3. 2 to +6. So a worse signal makes the upstream power too high not too low. Upstream (Tx) or return path signal levels will be much higher than downstream levels. The CMTS tells the MODEM what level it wants to "hear". Sep 5, 2020 · After several recent power outages, however, only the "Receive LED (downstream) LED" is blue. Correcting one level I've got Comcast Internet service at home (their "gigabit" 1200 down/40 up plan in the Midwest), and I've always had high-ish upstream power, but lately it seems excessively high, hitting 54 dBmV on the lowest-frequency upstream channel. Downstream Power shows the power of the signal your cable modem is getting. 3dbmv). 0) 53 dBmV maximum for S-CDMA DOCSIS 2. I don't think you posted the actual upstream power levels, but I would imagine they would be in the +48-50 dBmV range. (Downstream power level and SNR seem good, as far as I can tell. That helped for a while but now the levels are up in the middle to high 50s and I'm losing channels. side That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels. · actions Feb 9, 2005 · They are around the same levels I had when I would jury-rig fix it by disconnecting and reconnecting. Approved for use with major U. Noise SNR are all above Feb 21, 2017 · The Upstream power of your modem shows 51 [see attached screenshot] and the ideal is 40, so than means when the upstream power exceeds 50 dBmv, the CMTS instructs the modem to drop an upstream Apr 7, 2008 · 2010-Aug-3 12:49 pm. Log In / Sign Up Jul 7, 2014 · 2014-07-08 14:00 modem: upstream power: 47. Internet is working fine, but the Homerun Prime is having… Jul 17, 2017 · For upstream 30dB is weak, a whisper. A tech put it on there during install (at the time it was a customer owned modem), because he said my levels were way too high. That's because, as long as upstream power is not maxed out, what's important is not the level at the modem, it's the level (and quality) of the modem's signal as received at Comcast, which they control by adjusting May 24, 2021 · The upstream power is too high / out of spec. Channel Modulation Frequency Power SNR Correctables Uncorrectables. 0 dB 0 0. You're almost 6 dB worse than that. What are my options here, do I need a line tech? See signal levels and history: Downstream Modem Stats. No idea if this is also bad. -. If your upstream power level is at 58 dBmV or higher, an Need Help? Find Solutions, share knowledge and get answers from customers and experts. Do you only have internet or cable service as well And one of your upstream channels is way too high at 58. 0 Received Response to Broadcast Maintenance Request, But no Unicast Hi, For the past week or so my modem has frequently been disconnecting for a few minutes multiple times per day. When this happens, the blinking pattern of the cable modem's lights will look fairly similar to a fresh boot. Aug 11, 2020 · 31dB. Downstream Power Level: cable signal sent from the cable provider to cable modem. The SNR is how much chatter is going on with everyone else conversations. 1 modems and is probably not a cause for concern. 2) Remove any unnecessary splitters. Was having the same issue recently, then discovered there is something called a forward path attenuator. Downstream Power Historical Stats. " Usually the upstream power level is 48. ) Forum discussion: I've been looking around and somewhere I saw that my upstream power level should be much lower Downstream Frequency | 591000000 Hz Locked Signal to Noise Ratio | 34 dB Power Nov 22, 2023 · The modem upstream power levels are controlled automatically and continuously by Comcast's equipment to maintain the signal received by them at zero plus or minus 2 dBmV. Upstream Upstream levels are way too high. So something does seem wrong there. com/line-Signal-Forward-Attenuator-FPA6-54/dp/B07882H96R I have an account with Comcast and have recently been experiencing frequent slowdowns and disconnects. It is killing me since I work from home four days a week. Please Reload/Refresh this Page for a new reading 12 dBmV 11 dBmV 11 dBmV 11 dBmV Upstream Bonding We've had intermittent Internet issues over the past few months. This is very poor signal, as the downstream power has dropped about 11 dbmv (from +2 to -9) and the upstream is now too high as the modem is having to work harder to get a signal out at 51. Inability to communicate upstream shouldn't cause a cable modem to reboot, but it WILL eventually cause it to re-start the sign-on process from scratch, which can take quite some time. Good Upstream power levels are within 38-48 dBmV. Mar 3, 2020 · Upstream. There may be an issue in your area that is effecting the upstream, thus the high power level. The "Send LED (upstream)" is green. Your upstream power levels are too high which is causing T3 timeouts and thus your losing your Internet connection. The three signal levels that need to be within the acceptable level are Downstream Power, SNR (Signal to Noise Ratio), and Upstream Power. If upstream values are too high, it’s an indication that there is too much resistance between the modem and the headend. If you put in a attenuator to lower the signal the ISP would just request your modem send at a higher rate. These levels express how much power the modem is using to push a signal back to the headend. May 21, 2015 · Hello alkaisergjv and welcome, Yes, your downstream power levels do not look good but your upstream and SNR levels appear okay and this resembles the symptoms you have reflected to us. The downstream power levels for the 8 channels you posted Downstream should be between +5dB and -5dB so yours are a little hot but nothing really bad. Although most customers are probably operating in the 35 to 50 range, some work Sep 7, 2017 · Upstream (Tx) Transmit Power (a. My four upstream power levels are between 40. 100. 5 dBmV, and I have over 20% packet loss. When I connect the modem direct (no splitters or additional draws aside from the grounding block) the power level is still a rather high base of 45. 25-0. I have talked to Arris and they say that the upstream power levels need to be between 45 and 54 dbmv. 0/3. 0 dBmV). -10 dBmV is considered the absolute minimum. I would start at the cable entry point. That is transmit power and when the ISP gets too much signal it tells your modem to lower it value. Logs before it got connected back: Jul 30 2016 16:58:23 3-Critical R04. Normal Upstream Power Level - 35 dBmV to 49 dBmV; Maximum for DOCSIS 3. Ideally it should be no more than 51dBmV. That's because, as long as upstream power is not maxed out, what's important as Andy has stated is not the level at the modem, it's the level (and quality) of the modem's signal as received at Comcast, which they It’s best for cable internet speed plans up to 1. 5-3. Downstream Bonded Channels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels. but the power levels are still roughly the same. I've removed all splinters weeks ago. However it sounds like a noise issue on one of the upstream channels is your problem, which as long as you have bypassed all splitters, is outside your control. This number should be at 30 or more. I have reset the modem several times in an effort to resolve the problem, but these efforts failed to correct the This was the reply: The upstream power too high / out of spec for Comcast. S Cable Internet providers, including Cox, Spectrum, Xfinity and many others. 3). However, the power level on 1 of the upstream is 0. It has 8 downstream and 4 upstream channels. Sep 6, 2021 · The upstream power is too high and it may be intermittently fluctuating even higher to out of spec levels. Good Downstream power levels are within -7 to +7 dBmV. *Recommended Upstream signal Feb 10, 2021 · Quick search seems to show it is below maximum allowable levels (I assume the bold one is my signal): 50 dBmV maximum for OFDMA (DOCSIS 3. SNR (signal to noise ratio) levels: This is how clear the signal I was looking around in the modem's UI and I noticed that my upstream power levels on index #5 were SIGNIFICANTLY higher than all the rest (avg of 37. 55 is out of spec ! Comcast has disabled the extended upstream power feature for modems a while back. The power level on all downstream appears to be good (1. Mine are all below 44, so that is causing the modem to time out. There upstream power levels are not going to helped with an amplifier and they likely have extra splitters somewhere between the demarcation point and the modem to get levels of -7 and lower because the levels should be above zero at the ground block. The upstream power levels are OK -- Comcast's equipment controls them and automatically adjusts them as needed so that the signal they receive is at the proper level. 8 dBmv. Mar 10, 2024 · Comcast installed PPC-TM-U/U Active Return. I talked to netgear today and they said 48 was the maximum it should be. Just as an example the numbers from my modem (Comcast provided "business gateway") which currently works well: SNR: 40dB Upstream Power Level: 39-39 dBmV Upstream power levels high. The upstream will change inverse of the downstream changes. The upstream power level is controlled automatically by Comcast's equipment. Still lots of T3 errors in the modem log, and high upstream power levels (just in the last hour I saw 53. Now, USUALLY my upload is 20, (which while low, is as advertised). 1 downstream levels should be within -7 to +7 dBmV. Ranging Status Success. The upstream power level in the new modem is now 57db (see screenshot below). amazon. However over the last few days I have been experiencing constant Upstream Bonding Channel Value Channel ID 17 Frequency 18900000 Hz Ranging Service ID 11663 Symbol Rate 2. #3. I imagine this is due to the fact that the docsis 3. Closed. Downstream Power Level Cable Modems -10dBmV +10dBmV Gateways and EMTAs -7dBmV +7dBmV Downstream Signal to Noise Ratio 35dB - Upstream Power Level +35dBmV +50dBmV Upstream Signal to Noise Ratio 31dB - Upstream Receive Power -2dBmV +2dBmV . 1) 52 dBmV maximum for A-TDMA, TDMA & SC-QAM (DOCSIS 3. If you are unable to access your modem’s status page, you can contact Comcast Customer Support and ask the support representative for these values. Award. The fact that resetting the modem resolves it (for awhile) means it's probably a noise issue. Feb 6, 2022 · The upstream power does not work the way you think. Feb 6, 2021 · @ComcastBrie wrote: • Upstream Power Level: This should be between 35dBmV and 55dBmV. 0. Expand user menu Open settings menu. Downstream SnR/Power appear to be in-spec according to Arris' documentation. If the upstream is low you are whispering to your ISP when the downstream is too high they are shouting over the whisper and you start losing details of the conversation. I still haven't been able to get Comcast to help with the packet loss. Downstream is way too low and upstream is way too high. So there's a lot of room for improvement there. Fast forward a day later, it started having issues too. 0 - 52 dBmV Mar 8, 2021 · The large number of OFDM correctables seems to be common with DOCSIS 3. 2 QAM256 573000000 Hz 14. You likely have some issue with the cable in the wall. He placed an attenuator that lowered the downstream to around +6 and raised the upstream levels to 35. Comcast has it opposite on their end of what you see on your personal owned modem. Regardless your upstream that you pointed out is too low and why your having issues. A low/high transmit signal can be caused by a bad MODEM, internal coax, splitter (s), tap, amp, all Unless I'm reading it incorrectly the downstream power level is way too high and the upstream power level is a bit low as well. 5 mb upload. Every 1-2 days, we lose Internet completely, and I need to unplug the modem and plug… Feb 15, 2015 · I have had techs come out and completely rewire me from the modem to the outside box. 7dB MoCA splitter (after the PoE filter) in order to get MoCA up and running in my house, my upstream power levels reported by my Arris SB8200 modem are a little higher than what I'm reading is acceptable (now 50dBmV). 5. 168. May 12, 2022 · Only the Comcast plant / engineering specs matter; Specification Min Max Downstream Power Level Cable Modems -10dBmV +10dBmV Gateways and EMTAs -7dBmV +7dBmV Downstream Signal to Noise Ratio 35dB - Upstream Power Level +35dBmV +50dBmV Upstream Signal to Noise Ratio 31dB - Upstream Receive Power -2dBmV +2dBmV . bm mo ea do ls dn ya kd dy zz