ungrounded HUM/static sound with new router
Stephen:
Hi,
My Obitalk has worked great with a clear sound for about a month now.
But, the wireless part of my $20 router is going out, so I needed to switch to a new one.
The new, $120, router has QoS that is supposed to make VOIP even better. However, I get a HUM on the line that sounds like analog hum of an line that is not properly grounded.
I don't see how the router could induce an analog hum sound since the connection to the Obi is ethernet/digital.
Any thoughts on what may be happening here?
Thank you,
Stephen
Stephen:
forgot to note: Turning off the QoS feature improves a little.
Another sound analogy - it's very similar to the sound that would occassionally arise on a landline ("I think we got a bad connection, let's hang up and call back")
lk96:
Are you using cordless phones? if so, try to connect a corded-only phone to the PHONE port
and see if you have the same noise.
If you are not using cordless phones, try to move your phone handset further away from the router/antennas or
try to turn off the wireless interface of your router as a test.
Also, you may want to change the channel/band that the wireless part of you router is using
just in case it interferes with a cordless phone.
Some routers allow you also to adjust the transmitted power: that will depend on the range you
want to cover, walls/obstacles (ie walls, etc).
BTW as a side comment on Qos: that will help if you mark traffic coming off the Obi with
the appropriate DHCP/TOS marking. You can set to your liking the DSCP value for each
ITSP. But you will have to make sure that lower priority traffic in your network doesn't
use same value, and that your router is configured accordingly on how to handle that DSCP value.
L.
Stephen:
L - thank you for the great guidance.
1) I am using a cord-only phone.
2) The router does not have a means to turn off wireless. However, i plugged my old router back in to test for the 'clear' quality - still there. And, while doing this test, the new router was still turned on and transmitting (eg, my wireless gear was all still connected to it, though it was not currently connected to the internet).
3) my handset has a 20' cord and i moved closer and further away from the antenna - no affect - the hum stayed the same.
Is this type of hum common on some routers?
The QoS note is appreciated - though I'll have to do a lot of research to understand what means :)
Thank you!
Stephen
lk96:
Quote from: Stephen on January 29, 2012, 03:40:39 pm
2) The router does not have a means to turn off wireless. However, i plugged my old router back in to test for the 'clear' quality - still there. And, while doing this test, the new router was still turned on and transmitting (eg, my wireless gear was all still connected to it, though it was not currently connected to the internet).
when you say "still there" you mean that the good quality was still there ? so you are saying
that with both routers present/powered but with your old router handling the network traffic, you
don't get the hum ?
Which interface are you using? SP1, SP2? what services they have on them?
What do the statistics of SP1 and SP2 look like ?
Status-> SP1 & SP2 stats
can you cut/paste the data? do you see any abnormal stats when you use the new router ?
Quote
Is this type of hum common on some routers?
No. Your experience sound a bit strange.
so that the source of the issue is isolated, make sure you don't have any cellphone
near the phone handset.
L..
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