a T1 is a physical layer circuit. ISDN's PRI is technology that rides inside a T1. So you could have a T1 between two sites in a point to point setup, or You could have a PRI that forms a point to point when dialed across any of its B channels, between to sites what you have is a T1 between you and a telco (isdn) switch and your site. This connects you to the toll switched network or PSTN cloud. At the cloud you can make a call on any of the 23 B channels a B channel is 64k but there is another channel which is the D channel, taking up the last 64k channel. A T1 has 24 channels.
Brian Zeitz wrote: >OK, I am just confused, is a T1, and a T1 PRI are the terms used >interchangeably? What about ISDN PRI? Hope you don't mind newbie >questions :) > >-----Original Message----- >From: Sujal G. Ajmera [mailto:[EMAIL PROTECTED]] >Sent: Tuesday, March 12, 2002 2:26 PM >To: Brian Zeitz; [EMAIL PROTECTED] >Subject: RE: T1 Vs ISDN PR [7:37983] > >PRI gives you 23 channels of 64K each.. Which is equivalent to a T1 - >1.5Mb > >For a VPDN, users could dial into a PRI > >HTH > >Suj > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of >Brian Zeitz >Sent: Wednesday, March 13, 2002 12:31 AM >To: [EMAIL PROTECTED] >Subject: T1 Vs ISDN PR [7:37983] > > >Is there any drawbacks to getting a T1 PRI vs. a regular T1 (I think >that's called channelized). I am not sure of the drawbacks of using PRI, >with VPN, and things like that work fine over PRI? Is PRI just like a >regular T1? The reason I am asking is I tried to get a T1 and I was told >I could only get PRI ISDN. Any help or links for this would be >appreciated. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38004&t=37983 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
