ungrounded HUM/static sound with new router
gearblok:
i got the same noise when i first hooked up--it was the phone.
Everton:
Quote from: gearblok on January 29, 2012, 06:12:05 pm
i got the same noise when i first hooked up--it was the phone.
I'm not sure I understand you clearly, given your abbreviated way of writing. Are you saying you have isolated the problem and that the source of the hum/noise was the corded phone itself? If so, why was it not a problem when the previous $20 router was in use?
Stephen:
Sorry, the last post was not clear. The phone being used is solid, high quality - 18 years old and the best audio of any phone I've ever used. The phone is not the problem.
When going back to the old/$20 router, I get crystal clear audio over the Obi - nearly as good as my previous landline. This high quality remains even with the new router being turned on (though not connected to the internet, it is still broadcasting).
The hum problem only exists when connecting the Obi to the new router.
Having a cell phone nearby or not, has no impact on this hum problem.
Status->SP1 SP2 - I'm not sure what this refers to. Is this on my router, on the Obi somewhere?
lk96:
Quote from: Stephen on January 29, 2012, 08:13:51 pm
Status->SP1 SP2 - I'm not sure what this refers to. Is this on my router, on the Obi somewhere?
It's from the Obi management page. You can access it by pointing your browser to
the IP address of your Obi. One way to find it by dialing ***1 from the attached phone.
The part that is puzzling is that routers don't/can''t alter in any way audio quality:
they merely transport it in IP packets. By accessing the stats page I mentioned in the previous msg
i wanted to see if somehow you face packet losses.
BTW, does the other side also hear the noise? or it's only on your side ?
L.
Stewart:
Quote from: Stephen on January 29, 2012, 08:13:51 pm
Sorry, the last post was not clear. The phone being used is solid, high quality - 18 years old and the best audio of any phone I've ever used. The phone is not the problem.
IMO, that's not obvious. Some phones are sensitive to common-mode AC voltage on the line; the new router may have more leakage, which is being conducted over the Ethernet cable.
If this is the case, you will hear the hum, even when there is no VoIP. Pick up the phone, hear dial tone and press one digit to stop the dial tone. Do you hear hum? If so, does it get louder if you grasp the coiled handset cord with your hand? If so, that's likely the problem.
If the above is your issue, possible fixes: If the power plug for the new router is not polarized and does not have a ground pin, try plugging it in "upside down" (with the plug blades swapped). If no luck, try connecting the old router behind the new (OBi to LAN port on old router, WAN port of old router to LAN port of new router, WAN port of new router to modem). The old router must be set for DHCP addressing. Or, if you have an old Ethernet switch or hub, try connecting it between OBi and new router. If none of this helps, please post make and model of both routers.
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