Xfinity upstream power level. 3 dBmV - Upstream Channel 2: 51.

Xfinity upstream power level 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 Dec 11, 2020 · 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 Downstream Power Level: 10 dBmV Jan 3, 2025 · Hello mart. Downstream SNR Level: Good. Current Time: Mon Dec 02 19 Oct 11, 2024 · Hello Xfinity Support, I am experiencing intermittent internet connectivity issues. Startup Procedure Acquire Downstream Channel: 405000000 Hz Locked Connectivity State: OK Operational Boot State: OK Operational Security: Enabled BPI+ Aug 23, 2022 · @amd7674 just to point out, your post is the first posted evidence that Rogers is starting to use mid-split for the upstream channels. When I spoke to someone at Arris, they informed me that my upstream power Aug 13, 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. Once I brought it down to . Dec 3, 2024 · The Comcast Tech came to the apartment today and did a few things. I have removed the amplifier, and the downstream power levels are back to around 0dB but the upstream power levels climb back up to about 50dB. Jul 18, 2023 · 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: Dec 5, 2024 · He didn't specify anything about the maintenance other than a brief mention though. 3dBmV). Current time: Sun Mar 17 08:51:59 2024. 9dBmV). This was Nov 13, 2024 · Locate the "Upstream" section and find the listed power level. The XB8's status page under under Gateway > Connection > XFINITY Network is missing stats for Downstream, Upstream, & Codewords tables, it displays zeros or blank columns. 5 dBmV My Downs Oct 2, 2022 · Downstream Power Level: Good. Sep 2, 2021 · Xfinity upgraded me to an 800 Mps plan last April 2021, about the same time I started experiencing frequent internet outages. Upstream Power Level: Poor Upstream power is poor (51. 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 Jan 14, 2021 · The upstream power is too high / out of spec. 3) Replace any May 20, 2022 · The downstream power is on the low weak side and it may be intermittently fluctuating even lower to out of spec levels. Aug 13, 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, which will require more power (and will consequently have lower dBmV levels than QAM channels, but May 22, 2024 · Prior to doing so the power levels on the upstream bonded channels were OUT OF RANGE (EVEN THOUGH COMCAST SAYS IT'S GOOD IT DOESN'T MEAN IT IS). My XB7 has an Upstream Power Levels:Index 1-4 Power Level51. 1dBmV). That's because, as long as upstream power is not maxed out, what's Feb 23, 2025 · I should have said before: Arris' statement that your provider could "fix this from the office" is not correct. Forum security processing considers them "personal information" and may prevent the event log from posting if these are present. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, Sep 17, 2024 · Xfinity claims that Upstream Power Levels should be +35 to +50 dBmV. * Internet performance did not change after this, but noticed the firmware version did change. Current Time: Sat Jun 03 13 Nov 24, 2024 · Downstream Power Level: Good. 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. Power levels look good (downstream running 0-4dbmv). Rarely one or Jul 18, 2022 · The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. Downstream QAM Jan 27, 2025 · Upstream Power Level: Good. Partial Service: Poor Cable modem is in partial service mode. Startup Procedure Acquire Downstream Channel: 543000000 Hz Locked Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. Power Level. CM Status: Downstream Status: Upstream Status: Refresh Save Cable Diagnostic Info Jul 19, 2024 · Upstream power levels should be below 50 dBmV, ideally below 45. According to Kanishya N: "We would recommend you contact your ISP and ask them to adjust the cable signal level for upstream power level between 45-51. Dec 19, 2024 · If the levels they are sending are within those ranges, this will indicate a possible issue with a faulty cable splitter or a coaxial cable line in your area in need of maintenance. The T25 crashes and requires power cycling once or twice a week. The Transmit Upstream Power Level sometimes isn't Mar 30, 2024 · Perhaps there is noise ingress into the line(s) / an upstream channel / return path impairment somewhere. The gateway adjusts the power automatically, until it can't anymore, then it will reboot to save itself. · actions · Apr 9, 2020 · Several months ago I was experienceing upstream power levels at 56+. 4 of the 5 upstream channel power levels are too high / out of spec as well. 1) he took of my -10db attenuator, saying while it brought down the downstream, it also increased the upstream power to over the limit he Sep 7, 2024 · Downstream Power Level: Poor Downstream power is poor (12. Instead, type "Xfinity Support" there. Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. Arris says it should be 45 to 51, no exceptions. 5dBmV. Pretty radical change on the Downstream Power Levels, less impactful on 2 of the 3 upstream channels. There are other signal stat values that can't be read by the modem. Feb 20, 2020 · I contacted Arris, sent them my settings, they tell me my upstream power level is too low, and I have to contact Xfinity to have them adjust it up. May 27, 2020 · The implication is that either Xfinity or Arris is incorrectly measuring upstream power level. The change in the upstream level is likely to be purely cosmetic. Feb 23, 2021 · Perhaps there is noise ingress into the line(s) / an upstream channel-return path impairment somewhere. What's bothering me is the pwr level of the OFDM PLC channel which is outside of recommended -10 ~ 10 dBmv range. Aug 8, 2020 · I bought an Arris T25 based on the fact that Xfinity approves it for use in their system. Startup Procedure Acquire Downstream Channel: 543 MHz Locked @EG thanks for the response, funny enough a day or so after this post I received an email from Xfinity saying “your issue was resolved. Startup Procedure Acquire Downstream Channel: 639 MHz Locked Connectivity State: OK Operational May 18, 2020 · After a lot of reading-up on modem signal levels, I am questioning my downstream OFDM SNR - its 30-31 db. The S33 wants Upstream Power Levels to be +45 to +51 dBmV. Current time: Sun Oct 02 13:06:18 2022. The Comcast log was showing 49, but my CM1150V's upstream was b/t 50-53 on the same coax line. May 6, 2021 · 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. Dec 12, 2022 · A couple of months ago I was experiencing some packet loss and a technician was sent and diagnosed low upstream power as the cause. Jan 1, 2025 · Upstream Power Level: Good. But the upstream power levels have been creeping up for the last week till they are way over the high limit now. That's because, as long as upstream power is not maxed out, what's Jan 17, 2021 · It is a DOCSIS 3. Jul 19, 2020 · I'd suggest that anyone who is currently renting a Comcast modem and is planning on switching to a CM1150V check their upstream/downstream power levels in their logs before switching. Oct 2, 2022 · I was having connection issues all day Saturday 10/1, and today my combo modem/router is still diagnosing my cable connection as "Poor," specifically my Upstream Power Level as "Poor" at 51. A *forward path only* attenuator will only lower the downstream power levels and have no effect on the upstream power levels. I contacted Xfinity, they tell me they are sending me the correct power levels. Upstream Signal to Noise Ratio (uSNR): >31dB . It just dawned on me this morning that, based on your table, the Arris T25 acceptable upstream power level can exceed the Xfinity spec. . There are other signal stat figures that can't be read by the modem. Just remember that higher Apr 10, 2020 · I just wanted to know what the ideal signal levels should be for Downstream and Upstream SNR, Power Level. Current time: Thu May 04 10:33:36 2023. That extends the upstream bandwidth from 5 to 42 Mhz up to 5 to 85 Mhz. Jul 31, 2023 · I have a CM1000 and have a 800/20 plan. Startup Procedure • Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. If that's running higher than spec, you are trying to shove signal out past something -- another bad connector, cable, splitter indication perhaps. Jun 30, 2023 · @user_b7010f Take a look at downstream upstream power too. Current time: Wed Feb 05 11:38:15 2025. @EG is a very helpful expert of the Xfinity Forum community, and I trust his recommendations. I should mention that throughout all of this, only the upstream had been Oct 27, 2020 · Xfinity Community Forum. Here are my specs. It just doesn't work that way. The work that was done appears to have crippled your connection to Comcast's network. He said they need to be between 45-51 and mine are as low as 37. My upstream power level is 41 to 42 dBmV. 0dBmV and 35. Mattheww5 +2 more. " (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency May 24, 2021 · The upstream power is too high / out of spec. 3) Replace any required splitters. Good Upstream power levels are within 38-48 dBmV. Mar 21, 2024 · Upstream Power Level: Good. so that problem seems to be solved so far. That said. I somewhat corrected this by introducing more splitters and that moved my power levels to around 50. Seshan R (5/25/2020, 1:15:13 PM): The recommended power levels are the same for almost all Arris devices. Select "Xfinity Support" from that list. The recommended level is between -10dBmV to 10dBmV. ( 35m 51s ) Seshan R: Its Cable signal level issue. Current Time: Tue Nov 28 15:24:18 2023. Startup Procedure Acquire Downstream Channel: 435000000 Hz Locked Connectivity State: OK May 10, 2020 · Arris began saying the upstream should be in the 45-51 dBmV range more than a year ago. This is often due to poor coax connections or Jan 22, 2023 · I have added one forward path filter to get the downstream power levels to around 0dBmV to stop the hundreds of thousands of Uncorrectable Codewords I had been getting everyday. Seshan R: Your downstream power has a lot of difference and the Upstream power level is very low. Beyond that, power level adjustments require "boots in the field". ” so I checked the logs, the power was just a tad too high now. Expect to see upstream power levels between 35 dBmV and 48 dBmV, which is 'normal'. 9dBmV Upstream Power Levels and they aren’t getting Gigabit performance. 0 channels : Signal level: 36 to 40 dBmV (You might have three or four upstream channels) Note that the Hitron CODA-4582 typically runs in a Jan 21, 2025 · Thanks for coming to our Xfinity Community Forum with your signal level concerns. 5dBmV). These are as equally important in diagnosing connectivity issues as are the modem's stats. Current time: Sun Feb 26 11:42:03 2023. Startup Procedure Acquire Downstream Channel: 543000000 Hz Locked The most unfortunate part in all of this is that Comcast has done everything in their power to stamp out competition, and May 25, 2024 · Upstream Power Level: Good. If the upstream power is above 55 dB, it needs to be lowered. Upstream Status: Bad. The power level on all downstream appears to be good (1. Signal to Noise Ratio (SNR) is not listed on the upstream channels because it is measured at the CMTS. Be sure the ISP provisions the modem correctly. I'll be calling Xfinity to see if they can raise the power levels. Current time: Fri Sep 06 18:06:10 2024. Begin Quote----- These are the Comcast system / cable plant spec from the troubleshooting tips sticky topic at the top of this board. I'm told it's bad if the modem had upstream channels with power levels above 54. Correcting one level can impact another level and have you going in circles trying to figure it out. XFINITY sets their own power level standards and TYPICALLY you guys are WAY under what most modem manufacturers call for. Downstream Power refers to the line signal sent from the cable provider to cable modem. When I talked to Xfinity tech support, they ran diagnostics on my connection with them. Internet. ) What would cause upstream power levels that normally live Nov 17, 2021 · Upstream power signal level is currently running between 27. Current time: Sun Jan 26 20:03:10 2025. Jul 31, 2020 · The upstream power levels that your SB200 is reporting are the levels of electronic power that the SB200 needs to push out in order for Comcast to "hear" it clearly. Refresh the page at least twice to identify variations in SNR, Downstream Power, and Upstream Power. Your service provider might be under maintenance. It is leaving us with a half-working connection. Upstream Status: Poor. I checked all the other levels and they seem to be normal based on what the Arris representative told me. attenuator - if it's going to put more resistance in the downstream direction like splitters, I believe they'll also push up upstream power Nov 17, 2021 · Downstream Power Level: Good. In a self troubleshooting Feb 27, 2023 · The upstream power levels are controlled automatically and continuously by Comcast's equipment and do not need to be above 45 dBmV. Feb 6, 2025 · Netgear support said that I should contact my ISP to have my Upstream channel power levels lowered to a range of 38 to 48 dBmV. I would expect a first-party device (XB8 in this case) to provide the best support, hence provide the most stats, including "Upstream Signal to Noise Ratio" and "Upstream Receive Power". " (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Sep 16, 2024 · Inserting a splitter in line with the modem will cause the CMTS to tell the modem to increase the upstream power level. This resulted in a work order to have an amp placed up the street from my house to boost the signals. 8 dBmV - Upstream Channel 4: 52. I have great WiFi speeds. Mar 10, 2024 · @jdlail With the events mostly being random and more during the day it would be beneficial to set up a repair visit. I've been observing the issue this entire week and have noticed on a single day alone Monday, Jan 8, 2023 that the internet was completely out more than 22 times in a 27 hour time period. Let's go through a few more clarifying questions to get on the same page. 5 dBmV52. 5-3. we are trying to isolate this down to being either a WiFi-only Dec 23, 2005 · Upstream power level is regulated through commands sent by the CMTS to the cable modem, based on the strength of signal received by the CMTS. Feb 17, 2025 · with the upstream power levels being too low. 1 netgear modem. However, the power level on 1 of the upstream is 0. Being that my upstream power fluctuates between 50-51. level requirements. Startup Procedure Acquire Downstream Channel: 513000000 Hz Locked Had a Xfinity Tech come out last week and he removed an old amplifier that was installed in the attic claiming it was the source of the issue. 3 dBmV52. For SNR downstream it should be greater than 33 db. The way this works is the central system at Comcast waits for the SB200 to send data to it, and when it gets the data it ackowledges receipt back to the SB200. Do you think if it's a problem? Reg. Arris points at the upstream power level of about 40dBmV as the problem, and says that's beyond Arris' control. 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 attempt to keep as Dec 19, 2023 · Hi, @user_1dhux1!Thanks for taking the time to visit our forums page for help with those low upstream power levels. 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. 0. Jun 24, 2024 · Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post. 1 to handle the new speeds. Startup Procedure Acquire Downstream Channel: 405 MHz Locked • Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list • Type your message in the text area near Jul 10, 2023 · [Downstream Power Level/Upstream Power Level] Try these actions (Click the Refresh button after each step): 1) Make sure the coaxial cable is tightly connected. Sep 17, 2023 · @XfinityVictor At the time of making the post, I had used a signal boost amplifier that caused the downstream power levels increase drastically. Sep 5, 2020 · Arris says the issue is that my Upstream Bonded Channels Power Level is too low, below 45 dBmV (Mine are around 41-43 for the 4 channels I have). Current Time: Thu May 09 14:25:35 2024. My Arris T25 reports upstream power in the 40dBmV ballpark. 5 dbmV, is Sep 26, 2020 · If your Internet service is working well, don't sweat the upstream power numbers. Xfinity says upstream power levels are fine. Before purchasing the attenuator, we could run through some troubleshooting/signal testing as well to rule out anything signal wise from the area equipment Sep 6, 2021 · The downstream power is good / in spec. For example speaking to Arris support on this SB8200, they Nov 14, 2019 · The upstream section lists the channels you are connect to your ISP with. NoNoBadPuppy May 6, 2020 · Xfinity, please fix your upstream equipment. The recommended level is from 30 to 50dBmV. May 27, 2020 · I have a similar complaint. Downstream Power Level Upstream Power Level +35dBmV +50dBmV Upstream Signal to Noise Ratio 31dB - Upstream Receive Power -2dBmV +2dBmV . Feb 19, 2011 · The increased upstream power is necessary for the much wider OFDMA channels introduced in 3. Good Downstream power levels are within -7 to +7 dBmV. Upstream Power Level: Good. DarrenM May 4, 2023 · Downstream Power Level: Bad Downstream power is poor (-23. All other downstream channels are 35-39 SNR. Upstream Power Level: Poor Upstream power is poor (29. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels. Most of the time it won't affect your traffic and will automatically clear when work is complete. Values above 50 mean there is too much attenuation between the modem or gateway and Comcast's equipment. You've come to the right place! Between our helpful community members and Digital Care Team, we've got your back :) And we're awesome to work with 2 days ago · I have an account with Comcast and have recently been experiencing frequent slowdowns and disconnects. The diagnostics sho Oct 13, 2024 · My modem's configuration is showing full utilization of the downstream channels, however the upstream is being limited to only 4x SCQAM bonded channels. The splitter will also lower the downstream level by the same amount. Feb 23, 2023 · A Comcast technician was here two days ago and wasn't able to identify root cause and resolve the issue. Is unsupported bad? Meh, it can work. Mar 11, 2022 · The upstream power levels are controlled automatically and continuously by Comcast's equipment and do not need to be above 45 dBmV. Startup Procedure Acquire Downstream Channel: 669 MHz Locked Connectivity State: OK Operational Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. Specification Min Max. The "Xfinity Support" graphic replaces the "To:" line Jun 11, 2024 · @user_srzp4c an attenuator is a great way to help with power level output for modems. NOTE: If either of the signal levels is outside of the acceptable range, power cycle or factory reset the modem. Current time: Wed Nov 17 13:17:35 2021. 4. - As you are typing a drop-down list appears. 5 adapters to my network so I can utilize 3 unused coax cable jacks in a few rooms of the house to provide ethernet-like Oct 19, 2022 · The upstream power levels are controlled automatically and continuously by Comcast's equipment and do not need to be above 45 dBmV. Performing a Factory reset will erase any configuration changes and revert the custom admin password to the default password (password). Current Time: Tue Nov 21 15:34:25 2023. 3 dBmV - Upstream Channel 2: 51. Before purchasing the attenuator, we could run through some troubleshooting/signal testing as well to rule out anything signal wise from the area equipment 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 . Currently , my power levels are shown below. Startup Procedure Acquire Downstream Channel: 447 MHz Locked Connectivity State: OK Operational Mar 8, 2021 · 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. Comcast's systems automatically control modem upstream power to keep the level they receive at 0 dBmV (AKA 1 millivolt). Current Time: Mon Sep 23 22:14:59 2024. Uncorrectables are very small. 0dBmV). The downstream power is on the weak side as well. 0 dBmV and indicates some noise Feb 23, 2023 · Downstream Power Level: Poor Downstream power is poor (12. Expectation. 5 dBmV - Upstream Channel 3: 51. Upstream Power Level: Bad Upstream power is poor (59. The internet keeps cutting out entirely making it impossible to work, stream, and game. This is a measure of how much power is in the upstream channels. 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 (). I have your direct messages and will continue our conversation there going forward. Nov 28, 2022 · upstream: power levels; event log, if available (Be sure to remove or blot out any MAC addresses. An *overall* attenuator will also lower the downstream power but it will also raise the upstream power by an equal amount of dB's. Disconnect the modem's power, wait five seconds and reconnect it. Here are the details: - Upstream Channel 1: 51. Jul 31, 2023 · On a side note, I've read on the Xfinity forums that the specific tolerance range for upstream power is: Upstream Power Level: +25dBmV to +54dBmV. So, that might require a higher output level for the channels that run from 42 to 85 Mhz, as your OFDMA channel does. When I connect the modem direct (no splitters or additional draws aside from Jul 26, 2024 · [Upstream Power Level] Try these actions (Click the Refresh button after each step): 1) Make sure the coaxial cable is tightly connected. 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. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch. The three signal levels that need to be within the acceptable level are Downstream Power, SNR (Signal to Noise Ratio), and Upstream Power. 1 modem, and I bought it because it is recommended for xfinity and is more stable than my older DOCSIS 3. 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 Jun 23, 2024 · The upstream power is too high to being completely out of spec. " (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). Support online suggested that the power levels are also a bit low for my upstream (averaging 40-41 dBmV) and should be at least 45 to 51-60 dBmV (range depending on number of channels). side That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels. Yesterday I installed GoCoax MoCA 2. Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Apr 9, 2022 · The "To:" line prompts you to "Type the name of a person". Feb 5, 2025 · Downstream Power Level: Poor Downstream power is poor (10. Upstream Transmit Power Level: Channel: Jan 13, 2024 · The issue. 5 dBmV Feb 1, 2022 · The upstream power is too high / out of spec and the downstream power is too low / out of spec. U. The amp worked fine for about a week but then started malfunctioning in the manner I am attempting to describe Jun 11, 2024 · @user_srzp4c an attenuator is a great way to help with power level output for modems. Startup Procedure Acquire Downstream Channel: 507 MHz Locked Connectivity State: OK Operational Apr 10, 2020 · Signal level: 0 dBmV. Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers. I contacted Xfinity support to request the Upstream Channel power levels be lowered, but unfortunately when submitting my request via Chat support I kept getting re-routed to a new Chat support agent. Thank you for following the community guidelines and making a public post. 2dBmV). the upstream power levels are way out of spec in the second posting ! You should get the Nov 22, 2023 · Downstream Power Level: Good. You may read other sources that cite different numbers, but these are the specs for Comcast: Comcast modem level specs. Sep 24, 2024 · Downstream Power Level: Good. Current time: Sun May 26 19:13:45 2024. 0sBmV. The downstream power levels for the 8 channels you Nov 2, 2020 · They said the power levels are out of line and provided below recommendation : For Downstream Channel the accepted power level is -15 to +15 dbmv. Startup Procedure Acquire Downstream Channel: 447 MHz Locked Connectivity State: OK Operational Jun 4, 2024 · Downstream Power Level: Good. Also, +51 dBmV upstream is borderline Oct 7, 2024 · I was able to remove one splitter, no longer necessary since the cable now only feeds my router (no longer receiving TV from Comcast). Jan 1, 2025 · Upstream Power: The lower the number the better (within reason). Mar 31, 2022 · Downstream Power Level: Poor Downstream power is poor (14. I Dec 20, 2022 · I have a brand new Arris G36, the top router recommended by Xfinity. Startup Procedure Acquire Downstream Channel: 579 MHz Locked Connectivity State: OK Operational Boot State: OK Nov 13, 2024 · The target, for most (v)CMTS units, is that the upstream power levels received by the (v)CMTS is (around) 0dBmV, and the CMTS will direct the CM to set the power levels appropriately. Downstream SNR: Good. your upstream power should always be between +45 and +51 Seshan R (5/25/2020, 1:15:22 PM): By having the values in less than that, your device will have interrupted connection, slow or no connection at all. I noticed there was a single downstream channel (25) that had an incredibly low power level at -60 and an SNR of 14, which sometimes goes to 7, and the modulation says UNSUPPORTED. Comcast's signal specs are the ones posted in the Connection Troubleshooting Tips Forum  · Aug 11, 2020 · The downstream power is on the low / weak side and it may be intermittently fluctuating even lower to out of spec levels. My upstream power levels are consistently above 51 dBmV on all channels. nb, thank you for reaching out to our Forum and for being so detailed in your post, it really helps. That can cause random disconnects, 2 days ago · Typically, cable modems show the Downstream SNR, the Upsteram SNR can only be calculated at the remote end of the coax (usually at the node). 46, my modem has been working flawlessly. 4) Contact your service provider for troubleshooting help. After his visit the T3 timeouts and "Dynamic Range Window violations" were no longer present and my power levels are within spec again, but I was still seeing issues with the upstream. Sep 27, 2024 · Summary. - An "Xfinity Support" graphic replaces the "To:" Jan 24, 2023 · I'm not actually worrying about correctable errors. The "Xfinity Support" graphic replaces the "To:" line Jan 14, 2025 · What would cause upstream power levels that normally live in the lower 40s dBmV to periodically shoot up to the 50s. Signal to Noise Ratio: 36 to 40 dBmV (??) Upstream DOCSIS 3. Check the levels again after it powers up to see if levels have improved. I should also note I live in an shared apartment building. Acceptable levels are usually between 30 dB and 55 dB. Arris quotes maximum upstream powers from 51 to 61 dBmV depending on number of channels and symbol rate. For upstream channel the accepted range for power level is +45 to +51 dbmv. It has 8 downstream and 4 upstream channels. The recommended level is from 30 to 55dBmV. and the *Upstream Power Level* numbers and paste them into your next post. If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. Arris sent me the following table from their cable signal. Current Time: Wed Jan 01 18:38:51 2025. The technician can check the signals along with the lines and any splitters that may be connected and the main outside connection. Removing that AMP did improve the connection, but as shown in the This was the reply: The upstream power too high / out of spec for Comcast. Your upstream power level should be between 25 and 54 dBmV, so it sounds like that may not be an immediate concern. 6dBmV). Current time: Thu Mar 31 06:35:51 2022. As someone who has been in your shoes before, I understand the frustration that is caused by experiencing slow upstream issues. Sometimes just one or two channels, but other times all five. These were displaying correctly, up until 2024/09/24 after it rebooted itself. Sep 10, 2023 · Many downstream channels have out of spec power levels and SNR (too low), and all of the upstream power levels are also out of spec (too high). 4dBmV). Startup Procedure Acquire Downstream Channel: 543000000 Hz Locked Connectivity State: OK Operational Boot State: OK Operational Security: Enabled BPI+ Sep 20, 2024 · However I am not seeing such stats available for Xfinity's provided Cable Gateway XB8. A lot of Xfinity customers have +35 to +44. When I connect the modem direct (no splitters or additional draws aside from Jan 15, 2021 · What do the upstream power levels look like ? 0. ) If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally May 9, 2024 · Downstream Power Level: Poor Downstream power is poor (10. 3). When we upgraded, the tech that installed the new tv boxes and modem (TG4482A) replaced some cables and splitters as well, so Jan 30, 2025 · Hello, @sipslg01 we can assist with adjusting you upstream power. And the downstream power is on the low / weak side. That may or may not cause problems, depending on where the downstream power levels are now. The other day I upgraded my xfinity plan and needed to upgrade my current modem to a Docsis 3. Feb 10, 2021 · @EG Found this thread as I am waiting for maintenance to correct signal issues from the pole. I don't know why, because it's nonsense. Startup Procedure Acquire Downstream Channel: 579 MHz Locked Connectivity State: OK Operational Jun 3, 2023 · Downstream Power Level: Good. Startup Procedure: Procedure: Status: Comment: Acquire Downstream Channel: 525000000 Hz: Locked: Connectivity State: OK: Operational: Boot State: I have an open Netgear support case and they are telling me Xfinity needs to re-provision the the modem and something most likely went wrong when it was originally Mar 17, 2024 · Downstream Power Level: Good. 0 dBmV51. 2) Remove any unnecessary splitters. ( 36m 7s ) Seshan R: In your case, your coaxial cable is sending poor signal, and is affecting the Nov 22, 2023 · Downstream Power Level: Good. It is normal to have less upstream channels than downstream. This article gave me some ideas but I figure I rather ask the Have the ISP check the signal and line quality UP to the modem. Nov 24, 2020 · 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: Nov 28, 2023 · Upstream Power Level: Bad Upstream power is poor (59. His hypothesis was occasional signal strength or connectivity issues, but reported while here our signal strength looks good. Extended upstream transmit power is enabled and I cannot toggle that setting. My modem is a fairly new Cisco DPC3008. Jun 2, 2022 · There are other signal stat values that can't be read by the modem. Be sure there are no coax cable line splitters in the between the modem and Jan 14, 2025 · What does Xfinity consider acceptable upstream power levels? (I have an Xfinity TG1682G gateway if that matters. Dec 11, 2023 · There are a bunch of borked downstream channels (not locked, out-of-spec SNR's, and a large number of uncorrected bit errors. Upstream Status: Good. itjb bjr qgjjafr bzguysmt soqwx nmzu ulqf dckxo egffew btxnsj lnjjwl vkbwukd qkxt jtzgsi xmuyd