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On Thursday 29 January 2004 11:33 pm, Daniel Palmer wrote:
It's also possible to use the spair pairs in a Cat 5 cable for a telephone or another network connection :).
It depends exactly upon what equipment is connected to the network cable. iirc telephone's use 50v (whether this is just for the ring I'm not sure) -
It's 50VDC with 100VAC ringing. The reason for using such a high voltage is that there may well be a few kilometres of thin, antique cable, with lots of joins in it, between the phone and the exchange.
imagine what that would do to you network switch or even worse your laptop. I'd not advise trying.
Regular ethernet uses 2 pairs one for TX and one for RX. Typically the orange and green pairs. The other pairs will not be connected to anything, in some cases the connectors for them are absent in the sockets.
A far greater risk is in mixing between ISDN2 (on the S-BUS side) and ethernet. Since these use the same connectors...
But there again of course you can use a network cable for telephones - it's called voip and it works :) also it's pretty cheap to setup: Assuming a single pots line: Asterisk server - I used a spare K6 500 box fxo card - £50 ata-286 to connect up your normal phone - £50
If all you want to do is to connect up a single telephone line then it's a rather expensive option.
Quite a few IP phones support POE, which uses the two pairs not used for ethernet to supply power.
get a free account with voiptalk.org and/or fwd.pulver.com and you can talk free to anyone on their networks.
I do like the line "IAX (Inter-Asterisk Exchange) is the proprietary protocol used by the open-source IP PBX application called Asterisk (www.asterisk.org)." :)
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