Here is a good link for some basic T1 info.
It also has links for additional info.

http://www.commweb.com/article/COM20010807S0013

Prof. Tom Lisa, CCAI
Community College of Southern Nevada
Cisco ATC/Regional Networking Academy



Rico Ortiz wrote:

> Good question, curious of the answer myself. I opened up some telcom books
I
> have on the shelf and the give 8k to "overhead"
> but what overhead? is this signalling, framing?
>
> Rico
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Kelly Cobean
> Sent: Thursday, April 18, 2002 12:33 PM
> To: [EMAIL PROTECTED]
> Subject: How do you get that? [7:41832]
>
> All,
>    I was wondering if any of you have a good link to a site that explains
> how the bandwidth is derived for T-1/T-3 circuits.  What I'm looking for
> specifically is how we come to 1.544 Mb/s for a T-1 that is 24x64K channels
> which = 1536K, and what happens to the other 8K, and the same calculation
> for a T-3.  Descriptions of Robbed-bit signaling, etc., too.  Thanks much
> for your help.
>
> Kelly Cobean, CCNP, CCSA, ACSA, MCSE, MCP+I
> Network Engineer
> GRC International, Inc., an AT&T company




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