obi100 won't ring phone on incoming calls
ianobi:
Quote
So if I can find some ordinary cabled phones with 2 wires perhaps I won't need the Maplin adapters?
Yes, the Maplin adapters I suggested are only needed for the older style 3-wire phones, although they will do the job of adapting US to UK plug styles for 2 or 3-wire phones.
If you only have two wire devices plugged into your home phone wiring, then you might want to consider removing the third wire as shown here:
http://www.filesaveas.com/jarviser/bellwirenutshell.html
The OBi and your dect phone base are two wire devices.
The third wire is unbalanced being only one half of a twisted pair, so it can pick up "noise" from other sources and slow down adsl. If you go down that road you need to remove it from each of your home phone sockets.
Geoffster:
Ianobi,
Thanks again. I've just received the Maplin adapters and both my phones will ring now. Great.
You've saved me a lot of time wading through websites and not quite finding what I want!
From your last post I see there's a little more to this VOIP phone lark than just buying a VOIP box. I'll read the article you mention. If I can't make sense of it I know where to come for expert help :-)
Cheers
Geoff
Geoffster:
Ianobi,
I'm planning to set up a small office with two quite separate numbers using VOIP phones.
I'd like to site the VOIP boxes near the router (my preference, keep the techie gear in one place) but I have noticed background noise on the line when a longer run to the phone is used. Do you think this noise might be 'induction on the third wire' that you mention?
If I site the VOIP boxes at the desk (and ethernet extends to the OBi100 from the router) the line is then satisfactorily quiet, it's only the captive cable attached to the phone between the phone and OBi100.
I realise I'm shamelessly asking you for info :-) Don't worry if you've got a lot of ironing to do!
Geoff
ianobi:
Quote
but I have noticed background noise on the line when a longer run to the phone is used. Do you think this noise might be 'induction on the third wire' that you mention?
If you are using the existing house phone wiring, then the most likely cause of induced noise is the third wire problem. This does not just affect voip. It can induce noise into normal corded phone extensions and can slow down adsl performance. Extra-techie explanation is here:
http://www.filesaveas.com/jarviser/broadbandspeed.html
Some people have reported a doubling in their broadband speed after disconnecting the third wire. The increase in speed may take up to two days to happen as the modem in the BT exchange takes time to sample and "retrain" up to maximum speed.
Geoffster:
Ianobi,
Thanks a lot for your continued attention. Much appreciated.
Our house is wired throughout using Cat6/7 ethernet cable. The cable has an overall shield and each of the 4 pairs is also separately shielded. These cables are in a 'star' configuration. At the heart of the 'star' is a data cabinet which contains a BT hub, a gigabit switch, NAS drive, and a Satellite TV/Freeview/FM distribution amp. The BT telephone line arrives here and an adsl filter is also sited here so that the telephone landline may be distributed freely round the house without any individual filters in the rooms being needed.
The cable is terminated in suitably shielded ethernet sockets at both ends. It's this cable infrastructure that is used to distribute ethernet, telephone lines and even analogue audio.
If I site a VOIP box in this cabinet then I can distribute it's phone output using the star ethernet infrastructure to whichever room I want. An ethernet to BT socket adapter in the destination room provides the socket for the phone to plug into. It's this setup that puts noise on the line. There's kit in the data cabinet that will probably be radiating stuff. I wonder if that's the problem? So I have been siting the VOIP boxes in the rooms away from the data cabinet. That removes the background noise.
I haven't got round to troubleshooting by switching off gear in the data cabinet yet.....
Any comments welcome!!
Cheers
Geoff
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