PRI has 23B+1D. T1 (also called a "channalized" T1) has 24 B-channels.
Therefore, you have a 64k bandwidth difference. The book is correct because
only T1 has 1.544MB (usable) bandwidth.
Both use a T1 circuit. The difference can be important if you're using the
circuit for dial-up modem users. If you have 48 modems in an AS5300 with
two PRIs for the dial-up, only 46 modems can be used concurrently. If you
have two T1s, all 48 modems can be used concurrently.
Edward Watson, CCNA
Consulting Engineer
Info Avenue
3545 Centre Circle Drive
Suite A
Fort Mill, SC 29716
803.802.6507 (voice)
888.662.5835 pin-15309 (pager)
[EMAIL PROTECTED]
www.infoave.net
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
NetEng
Sent: Thursday, September 28, 2000 10:44 AM
To: [EMAIL PROTECTED]
Subject: PRI vs T1
Is there a difference between a PRI and a T-1? What has 23B + 1D? What one
has 24B? The reason I ask is I have a practice question that asks, "what
provides 1.544Mbs bandwidth." PRI and T-1 are answers, but only PRI is the
correct answer (according to the test). What's the final answer????
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