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Forum Discussion
+9dB downstream not good enough?
Connection troubleshooting states "Good Downstream power levels are within -7 to +7 dBmV". However, even at +9dB, my CM1150V was not providing a solid link, my router was frequently loosing connectiv...
Most decent quality ones should be fine. Its not always the splitter. It could be the end connector that it doesn't have caps on it, not being tight enough, etc.
I used to run around that same 13-14dbmv and it worked fine. Then I started to get errors so I used to just use a 4x way splitter for a while but then it started having errors. so I just picked up a signal attenuator and connected that in line. Has been working fine for around 6-8 months. They're not to expensive. I think I picked up a 3,6,9 dbmv attenuator so I could play around with the signal levels.
Thank you plemans. The 3-way splitter was a brand new one installed by Xfinity. And they did also install, I believe it was an attenuator outside the house. All of the cabling was new, all the way out to the pole. I will try to find the best 3 or 4 way splitter I can, and see if that one works. I was just looking at this Amphenol splitter on Amazon (https://www.amazon.com/AMPHENOL-IPGH3M4-VF-Infinity-Premise-Splitter/dp/B07CQTHL33/ref=sr_1_3?crid=1QFSC6DT9ANJF&keywords=coaxial+3+way+splitter&qid=1691683904&sprefix=coaxial+3+%2Caps%2C94&sr=8-3) that has one -4dB hybrid output, 2x -7.5dB hybrid outputs, as well as 4 -12dB MoCA outputs. If it's truely Amphenol, I believe it should be of good quality. I like that it allows for three different levels of dB reduction and would allow MoCA use in the future.
UPDATE 19AUG2023: I received and installed the Amphenol IPGH3M4-VF splitter. I can achieve a solid internet connection using the -4dB H1 port which yields downstream channel power ranges of 10.1-11.2dBmV. I tried one of the -7.5dB ports which yields downstream channel power ranges of 6.8-8.3dBmV however the internet connection is then very poor. It was also poor using the -5dB port on the new 3-way splitter Xfinity had installed. It is confusing to me that the modem is supposed to prefer -7dBmV to +7dBmV, but my particular modem performs poorly below +10dBmV. Does that indicate my modem is faulty? Thanks all... AL
I was experiencing poor connectivity using a 1yr old, 3-way splitter installed by Xfinity. It worked fine using their modem but using my CM1150V my connection was poor despite downstream channel power levels of 8.2-9.8dBmV and SNR of 42-43dB.
I tried it using no splitter and the connection was then fine, but power levels were up to 13-14dBmV and forum members suggested that it too high as -7 to +7dBmV is suggested.
One on here suggested it could be the 3-way splitter. So I installed a new Amphenol IPGH3M4-VF splitter. I can achieve a solid internet connection using the -4dB H1 port which yields downstream channel power ranges of 10.1-11.2dBmV. I tried one of the -7.5dB ports which yields downstream channel power ranges of 6.8-8.3dBmV however the internet connection is then very poor. It was also poor using the -5dB port on the 3-way splitter Xfinity had installed. It is confusing to me that the modem is supposed to prefer -7dBmV to +7dBmV, but my particular modem performs poorly below +10dBmV. Does that indicate my modem is faulty? Thanks all... AL
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-routerFYI:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
