Reformatted top-posting... On Fri, May 06, 2005 at 08:30:52AM -0600, Andres Paglayan said: > Walt Reed wrote: > >On Fri, May 06, 2005 at 10:25:24PM +1000, Joerg Wleklik said: > >>On Fri, 6 May 2005 22:10, Eric Wieling aka ManxPower wrote: > >>>Joerg Wleklik wrote: > >>> > >>>>Does anybody have experiences with plugging 3 TDM400P cards in one PC?? > >>>> > >>>If you need 12 ports then you should use a T-1 card and a Channel Bank. > >>> > >>That would be easy, but...... > >> > >>I have 8 analogue lines incoming right now and changing the phone number > >>is not an option (costs for advertising). This lines go right now into an > >>analogue PBX. A new building will get IP-Phones connected to an asterisk > >>box. > >>The idea is to take the incoming calls in the asterisk, route to the new > >>building via IP and serve the old PBX with 4 analogue lines. > > > >That's what the channel bank does. > > > >The other reason you want to use a T1 card over multiple TDM400 cards is > >that the 3 TDM cards will generate 3 times the number of interrups, and > >likely have interrupt sharing problems. Good channel banks also are > >going to be much less prone to have echo problems. You also will have > >room for expansion. > > > >BTW, if you went with a new T1/PRI to the telco, you can probably have > >your old numbers forwareded / migrated.
> Why the channel bank if he will be routing extensions to ip phones? > The T-1 card should suffice if he isn't serving analog extensions. > Thats $600 (t1) instead of ~ $1000.(3 x 3?? tdm400p) > line cost wise 12 channels on a t1 should be cheaper than 8 pots. Because he STILL needs analog lines for the legacy PBX (read above), and he does NOT have a T1 now - just POTS PSTN lines. That's 12 analog ports needed. Now if he were to convert to a T1 (or E1 / PRI) for his PSTN connection (as I mentioned,) then he could get a couple cheap Sipura's for the legacy PBX and forget the channel bank. Depends on what he can get for T1/E1/PRI pricing (8 channels is usually not very cost effective.) _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
