What causes low upstream power levels. 1 modems and is probably not a cause for concern.

What causes low upstream power levels After all is said and done I noticed the levels in almost all the categories are now different. Mar 11, 2020 · The upstream level is controlled by the central equipment. We only have had problems with the download speed. Upstream can sometimes be a nightmare to troubleshoot. 1, which will require more power (and will consequently have lower dBmV levels than QAM channels, but Feb 19, 2011 · The increased upstream power is necessary for the much wider OFDMA channels introduced in 3. If I remove the splitter then up is around 37 n down is closer to 0. Have a low number I can't see is a problem. The recommended level is from 30 to 55dBmV. Is it all the time? I had an issue where there was a kink in the line and if too many people were on the downstream/upstream would to go hell. When it comes to that all you can do is call your ISP and they should be able to locate the problem. Oct 2, 2024 · Low downstream power means that the power level which is reaching your modem is too low. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the unbonding of the multiple bonded upstream channels (you only have one ). Dec 10, 2017 · A low upstream power number generally means the cable company equipment is receiving good signal levels from you. Your downstream levels are fine so don't add an amplifier and adding a splitter will increase your upstream levels. If it is having trouble hearing your modem it tells it to transmit at a higher level. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels. Downstream SNR: Good. I've read that a good downstream power level is between -7 to +7 dBmV and a good upstream is between 38-48 dBmV. 3). Check the levels again after it powers up to see if levels have improved. I have an account with Comcast and have recently been experiencing frequent slowdowns and disconnects. This is causing the modem to reboot. Screenshot of Downstream\Upstream Jul 31, 2023 · Evaluate the power levels. My downstream is -21 and upstream is 54. You can only see how much power you put into the wire not how much is coming out. Ideally, it should be as close to zero as possible. Loose connections can sometimes impair low-frequency carriers without impairing higher frequencies very much. 1, which will require more power (and will consequently have lower dBmV levels than QAM channels, but Feb 20, 2020 · Thank you for your response. The 4th is definitely high but locked (go figure). Feb 19, 2011 · The increased upstream power is necessary for the much wider OFDMA channels introduced in 3. Thanks for the reply, I understand some fluctuation is normal, but I have tremendous changes, sometimes the power levels are are about 10 dbmv apart, and when it hits 54 or higher the modem resets, according to my modems page 54 is the limit so that makes sense, I have a Motorola 7700, it also suggests a recommended power range of 37-48 dbmv which mine are very often in the high 40's, low 50's. 5-3. Tighten every F-Connector you see. If you add more cable (or a splitter) the modem has to 'try harder' (use more power) to get a good upstream connection. Mar 8, 2021 · The large number of OFDM correctables seems to be common with DOCSIS 3. And your upstream levels are a just a bit below the recommended, which is 37-48 for four channel modems. . Jun 19, 2020 · The upstream power is too high / out of spec on channel 1. If you put, say, a 12dB attenuator to get the upstream power level from 36->48dBmV, great! Now the upstream is in spec. Once your upstream power value increases past 48 dBmV, it means that your modem is having to work harder to output adequate upstream power Feb 6, 2022 · In addition you actually DO want to lower the upstream levels. What is causing us to have a low downstream power level? I have spectrum if that helps. 0dBmV. My modem is a fairly new Cisco DPC3008. Believe it or not low transmit levels do occur just not nearly Jul 19, 2020 · This lady tried telling me that my downstream power levels should be at least 35, and my upstream issues were caused by my modem. Also, if you're using 2+ splitters that'll cause an issue. However, the power level on 1 of the upstream is 0. I didnt think to ask, til they left but Im wondering if these levels are all good? I thought I read somewhere that ideally you want power level for downstream to be as close to 0 as possible. 1 modems and is probably not a cause for concern. Our power level for the upstream is normal and we have never had a problem with upload speeds or ping. The Cable Signal Levels are the information your device is getting from the coaxial cable, unfortunately we can not adjust them. This tells me that the signal level is too low for the modem to connect to a bonded upstream channel. Mar 11, 2020 · In general if you have a cable issue you see low power levels in the download side and high levels in the upload side. The "Send LED (upstream)" is green. Nov 17, 2012 · My cable modem has been pushing the limits of the allowable upstream power levels (getting between 55-58 dBmV). You can not actually see the real upstream levels. Sep 26, 2020 · As mentioned in the troubleshooting guide you'd be asking for the Upstream Signal to Noise Ratio (should be +31dB or more), Upstream Receive Power (should be between -2 dBmV and +2 dBmV), and ICFR (should be 2 dB or less). Downstream is way too low and upstream is way too high. 35DbmV is not a super low upstream TX. It has 8 downstream and 4 upstream channels. Is this Standard HFC or RFoG (or even a Trunk node)? It sounds like you took an existing node, and split the forward into a separate DSG, and this is not Jul 18, 2015 · technically low transmit levels (upstream power) can cause connectivity problems too. You can see how many errors you are getting, uncorrected errors means Jul 31, 2023 · One of the most common causes of upstream power problems is splitters. Upstream Status: Poor. If they were receiving poor signal levels the equipment would Here's the rule: Attenuators will increase upstream power levels and decrease downstream power levels. Three of your upstream channels are not locked but not out of signal level range (on the higher level). Your upstream power should always be between +45dBmV to +51dBmV and your upstream power levels at the moment are between 42. Upstream Power Level: Poor Upstream power is poor (27. Your downstream power levels are pretty high. In general if you have a cable issue you see low power levels in the download side and high levels in the upload side. I'll attach an image of the power level of our downstream on the modem, if anyone can help it would be Generally the upstream is supposed to be in the low-to-mid 40s AFAIK. If possible, your cable modem for your internet should be on the first splitter attached to the line that comes in from your house. Each one has separate power levels and SNR listed for it. But the modem reboots even more often. Disconnect the modem's power, wait five seconds and reconnect it. After calling her out on her nonsense, she abruptly told me “your do sis connection is great,” scheduled another tech to my house tomorrow, and got off the phone. Low downstream power is caused by too many splitters or attenuators or too long of a cable run. So something does seem wrong there. What a low number on upstream means is the ISP is seeing too big a numberjust like your are. Ideally you want upstream around 40db. 0dBmV). You'll have some downstream channels and also some upstream channels. Acceptable levels are usually between 30 dB and 55 dB. The power level on all downstream appears to be good (1. These are classified into two types, upstream and downstream. Not too high where I think it’d cause major problems, but the level wanted is between +7 to -7. Had to have them fix it to resolve it. 75BmV and 40. The flatness of the DS signal levels are strange. The modem starts low and then uses higher and higher power until it makes a good connection to the headend. If your noise floor is low enough I have modems in the mid-high 20's with 40+ Upstream SNR. Nov 17, 2012 · If your downstream levels are decent (above -10dBmV or so), this could be due to a loose connection. Sep 5, 2020 · After several recent power outages, however, only the "Receive LED (downstream) LED" is blue. Jul 31, 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: 31dB-Upstream Receive Power-2dBmV +2dBmV I now have all the available upstream channels locked. And sometimes my upstream will only lock 1 or 2 of my channels. Feb 1, 2022 · The upstream power is too high / out of spec and the downstream power is too low / out of spec. Nov 17, 2021 · Downstream Power Level: Good. If the upstream power is above 55 dB, it needs to be lowered. Startup Procedure Acquire Downstream Channel: 549 MHz Locked Connectivity State: OK Operational Boot State: OK Operational Sep 29, 2022 · Any power levels outside of the above ranges should be noted, particularly excessive upstream power values. This is the level that the ISP is seeing you modem at. I've worked with their supervisor who advised me to put a splitter on cause I was getting too much power, that brought my upstream power levels to just under the minimum recommended while my Down stream dropped to -11 in some areas. You can mitigate low downstream power levels with a coax amplifier. Contrary to what instinct might tell you, high upstream power values indicate low power levels. So splitters decrease downstream and increase upstream signal levels. Downstream power levels should be between -10 dBmV and 10 dBmV. Is there something I can do to reduce the upstream power level? I'm not entirely sure what causes this - could the number of things plugged into that surge protector affect it? Locate the "Upstream" section and find the listed power level. 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. One major cable company spec is 31 min 53 max. 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