> > In the post that I was responding to, the writer hinted his understanding > > was that T1 to T1 channel connections didn't involve any asterisk code. > > His impression seemed to suggest that codec selection, etc, wasn't a > > factor since the analog fax modem signals were coming in one T1 channel > > (or PRI channel) and going out another without passing across the * pci > > bus. (Purhaps I've have read too much into his post though.) > > > > If the analog modem signals are transitioning the * pci bus, there > > is a high likelihood the modem signals will not be accurately handled > > by * and thus limit the speed at which the fax modem will function. > > Don't read that as "it will", but rather "it might". (See many past > > posts relative to analog modem usage through asterisk, and many other > > posts where readers didn't understand the significance of g711 usage > > and analog modems via asterisk.) > > I think the data may get to the zaptel driver on a native bridge. I'm not > sure if there is a cross-connect in the actual TE405P card. However, > barring missed interrupts there should be no frame slips and no signal > degradation when passing a call from one T1 to another T1 on the same > TE405P card. They all share the same clocking and there should be no > slips, missing data etc.
I don't have a 405P card here to test, but I'm fairly certain the card does not have any onboard logic to cross-connect channels, implying all cross-connects happen on the zaptel/asterisk side of the pci bus. Given the track history of missed interrupts (etc), its fair to adjust the expectations from "will work" to "might work". In a recent discussion with technical folks at Supermicro relative to pci latency issues, comments like "Latency is the biggest issue since Intel is using I/O hubs on most of their products" imply the later chip sets are worse then older ones (for whatever reasons). Their lowest latency motherboard recommendation is actually a two year MB. I would not be a happy camper if I invested in 405P cards, etc, with the expectation that fax "will" work and then find out later it doesn't, followed by posts that we've all seen relative to "get a decent MB". _______________________________________________ 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
