-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Stroller wrote: > > On 24 Apr 2009, at 19:38, Michael Higgins wrote: > >> On Thu, 23 Apr 2009 19:08:48 +0100 >> Stroller <strol...@stellar.eclipse.co.uk> wrote: >> >> [...] >>> If you want Asterisk to answer your conventional POTS phone line >>> then you can use an X100P card which you can buy for c £17. AIUI this >>> is basically a modem based on a certain chipset that Digium have >>> written drivers for. >> >> They have unequivocally dropped support for these cheap cards. They >> suck anyway, but this isn't to say you can't play with one.... I still >> do, after all. >> ... >> This may be true, but I believe it's more because the cards, as every >> one will tell you straight up (unless they are selling you the card, >> of course) are of poor quality and design. >> Yep. There are driver issues, voltage/signalling problems... and in >> the end, even if working, they won't sound good. There's a reason they >> are, like, $10 on Ebay. >> >> Basically, they are decent winmodems (if such a thing is possible)... >> that they can be used for telephony is a fluke. >> ... >> My time figuring out the first glitch between my card and the (sort >> of) supporting driver would have been saved/paid for by buying a real >> FXO/FXS card initially. > > Hi Michael, > > Many thanks for your comments. How much is one looking at for a "real" > FXO/FXS card? > > I'm not sure the difference between FXO & FXS - just want something to > "convert" my home phone line for use with Asterisk or similar. Don't > bother giving me model numbers or anything like that - I can do my own > research & I'm sure the situation will have changed by the time I get > around to deploying. Just interested in a labb-park figure, as the > little Irish girl said.
You seem to want to know the difference, FXO vs FXS. If I got this wrong, just delete it. FXS is meant to interface to a telephone set, so it gives talk battery and (as needed) ringing current. FXO is meant to interface to a line from a telco switch, so it accepts battery (if the circuit it's hooked up to doesn't give talk battery, you have no circuit) and expects to be rung into, so it detects ringing battery. Most of the time, both FXO's and FXS's offer options to operate in loop start (regular POTS) or ground start mode. Write me if you need more on that last. Options like reverse battery aren't usually offered in FXO/FXS cards. You usually have to give a FXS card your own source of ringing battery, not FXO, because an FXO is expecting to have ringing battery sent to it (from the telco switch it's connected to) to begin with. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAknyJcMACgkQz62J6PPcoOkDCQCgkZDtKOBXKvU+QT0Byyg4UWCN YvMAnRwS2MKrVjpGV23kscQzbWfQwMPV =n5oK -----END PGP SIGNATURE-----
