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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...
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
Are you using the proper termination caps on the unused splitter connections?
Link from Amazon: https://a.co/d/eClKMrs
it could just be using the splitter as well and not a signal attenuator.
That splitter is a bit fancy and not your typical splitter. Could be doing some filtering thats causing issues.
Hi Plemans. Thank you for your feedback. My CM1150V was also not working well at all with the more basic 3-way splitter Xfinity had installed (which was brand new). And it also does not work well using a -7.5dB port of the Amphenol splitter, but it's been working fine with the -4dB port on the same Amphenol splitter. I did order and received 10 of the port terminations recommended (ty Kitsap for that recommendation). So I am going to install seven of those tomorrow and can try one of the -7.5dB ports again, after terminating all of the others. I will also work to get those log files etc.. I am off tomorrow so will have more time to work on this then. Thanks again to all, I really appreciate the support!... AL
