Path: utzoo!attcan!uunet!wuarchive!cs.utexas.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: wb8foz@mthvax.cs.miami.edu (David Lesher) Newsgroups: comp.dcom.telecom Subject: More on Stamford 1AESS crash Message-ID: <8298@accuvax.nwu.edu> Date: 26 May 90 01:40:40 GMT Sender: news@accuvax.nwu.edu Reply-To: David Lesher Organization: TELECOM Digest Lines: 18 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 387, Message 8 of 12 From comp.risks Fri May 25 21:40:37 1990 Date: Fri, 25 May 1990 14:37:39 PDT From: "Peter G. Neumann" Subject: More on Stamford CT Telephone Switch Outage (RISKS-9.93) AT&T announced today that they have resolved most of the cause of last Thursday's 18-hour local-call switch outage. Apparently 10,000 subscribers were being moved from the #1A ESS to the new #5 ESS. During the cutover there is apparently a two minute atomic-action interval during which nothing works. Due to a burp, call storage was lost altogether. They found procesor problems that have STILL not been diagnosed. They also found a cable that had been incorectly connected last summer, and that remained undetected until the crash. When the backup failed as well, diagnostics could not be run except by old-fashioned oscilloscopic probes. [Source: Brief phone conversation with Seth Angott of {The Advocate} in Stamford CT. Any inaccuracies are mine.]