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From: louie@sayshell.umd.edu (Louis A. Mamakos)
Newsgroups: comp.sys.next
Subject: Re: T1 leased lines???
Message-ID: <1991May28.183828.5794@ni.umd.edu>
Date: 28 May 91 18:38:28 GMT
References: <1991May28.174425.5086@menudo.uh.edu>
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In article <1991May28.174425.5086@menudo.uh.edu> mahmoud@karazm.math.uh.edu (Ahmed Mahmoud) writes:
>Does anyone know the speed of a T1 leased line....thanks for the info 
>                                          ahmed

The raw signaling rate is 1.544 Mb/s (that's BITS per second, and not
BYTES).  Now, depending upon the CSU/DSU that you have and how the T-1
line is configured (D4 framed or ESF) the USABLE rate might be 1.344
Mb/s, 1.536 Mb/s or 1.544 Mb/s.  You also have to worry about the 1's
density of the data that you shoving across the line.  If you're using
inverted HDLC, then you get the guaranteed 1's density that works;
otherwise you have to configure your CSU/DSU to insert a 1 bit every
so often, thus reducing the amount of usuable bandwidth available to
the "user".

louie