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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