Jared Smith wrote: > On Thu, 2007-07-19 at 12:11 -0400, mail-lists wrote: >> thanks for your reply - Our setup isn't complicated at all - just a PRI >> coming into an asterisk box. Maybe you could answer another question for >> me - what disadvantages does a PRI have from a channelized T1? or vice >> versa. > > A channelized T1 is 24 channels over a T1 -- basically little more than > 24 POTS lines that happen to come across a 2-pair digital interface > rather than 24 pair analog interface. PRI over T1, on the other hand, > only gives you 23 voice channels (often call B or Bearer channels), and > uses the 24th channel for call signalling between you and the upstream > switch. (This channel is called a D or Delta channel and I've even > heard it called a Data channel, although my friends in big telco say > that the D doesn't stand for Data.) PRI gives you much more advanced > call control, allows you to more easily do things like DIDs, and gives > much quicker call setup and dialing. Depending on your location, the > only major downside to PRI might be price... they're often more > expensive than channelized T1s.
That's what I pretty much thought - We're about to sign a two year agreement so I wanted to make double sure a PRI was the best route. > >> is the TE205 the double port version of the TE120P? > > Yes, the TE205P is the 2-port version of the TE120P. Once you get to > the 2-port versions and 4-port versions of the Digium cards, they come > in three flavors: a card for 5-volt PCI slots (the TE205P, for example), > a card for 3.3-volt PCI slots (the TE210P, for example), and a card for > a PCI-Express slot (the TE220P). > >> Also, what's required as far as echo cancellation goes? Is that built >> into these cards or do you have to move up to a TE207P? > > It depends... if you're OK with software echo cancellation, you don't > need anything special. If you want the hardware echo cancellation > (which many people do), you could move to the TE207P or TE212P cards > (for PCI slots in 5v and 3.3v, respectively), or the TE220P plus a > VPMOCT064 echo cancellation module. I'm going to look into what sort of overhead software echo canceling incurs and go from there. Is it possible to get a TE205 and then add the echo cancellation separately or are they sold as a unit? I don't see any info about the TE220 and a google search for vpmocto64 didn't turn up much. > >> What is the difference between a TE205 and a TE210? > > Explained above... difference between the different types of PCI slots. > >> Sorry about all the qeustions - the info on digiums web site doesn't >> really make this clear. > > I agree. Luckily, I know Digium's marketing department is working to > improve the information on the website so that it's clearer which > hardware is appropriate for different situations. > Thanks for all the advice/answers. _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
