AT&T ATM Outage This Week

[Spencer.Wood () dot state oh us]

The following is from our ISP describing the AT&T ATM Outage:

ATM Network -
AT&T had an ATM network-wide outage on Tuesday affecting some of our DS1 
and DS3 ATM connections.  The outage began at Tuesday at 1:30 p.m. 
affecting 17 switches.  Switches were restored by 4:30 p.m. but outages 
continued into the evening due to switch restarts.  AT&T attributed the 
outage to a cable cut resulting in excessive number of control messages 
from one of AT&T's network switches.  The switches were unable handle the 
message volume and failed.  AT&T turned down some of the links between 
switches to isolate the problem.  Problems continued in Columbus on 
Wednesday due to an unknown issue with the Lucent switch.  PVCs were up 
but 
are operating slowly.  Another failure in Columbus on Friday morning 
affecting four of our DS3's was isolated to a link between Columbus and 
Cleveland.  Service was restored by late morning.  We are expecting a 
written summary of these issues from AT&T.



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Spencer Wood, Network Administrator
Ohio Department Of Transportation
1320 Arthur E. Adams Drive
Columbus, Ohio 43221 
E-Mail: Spencer.Wood () dot state oh us
Phone: 614.644.5422/Fax: 815.361.0714 
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