Re: just what IS a serial line "carrier transition" anyway?

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1 total messages Started by Allan Leinwand Wed, 12 Sep 1990 17:22

#672

Author: Allan Leinwand
Date: Wed, 12 Sep 1990 17:22

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In-Reply-To: <3986@ursa-major.SPDCC.COM>; from "Steve Dyer" at Sep 11, 90 10:19 pm
X-Mailer: ELM [version 2.2 PL16 mips 1]

>While I'm trying to get to the bottom of this 56kb line problem, I am
>wondering just what a "carrier transition" is on a DDS circuit and how
>I could get 2000 of them in the space of 2 seconds or so.

A carrier transition is a when the carrier signal on a serial interface
changes state.  This can include going from down -> up and from up -> down.
If you have gotten 2000 in a second or so, you most likely have a
extremely bad data circuit.

This can be caused by your CSU/DSU or the circuit itself.  I would swap the 
CSU/DSU, the cable between it and the cisco and even tell your circuit 
provider about the problem.  A good test may be to put your CSU/DSU in local 
loop and see if you can ping yourself out the bad interface.  This can 
eliminate the CSU/DSU and the cable as part of the problem.

-- 
Thanks,

Allan Leinwand
cisco Systems
leinwand@cisco.com
(415) 688-7653

"These are my friends. I made them myself."
                    - Repo Man

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