daryl@tcomeng.com (Daryl Jones) (03/23/91)
Tuesday at about 2 pm, several Centrex systems in the 415 area were
out of service for about 45 minutes. I received a call back from a
Pacific Bell trouble reporting center in North Hollywood after the
problem had been corrected. I was told that an error had been made
when installing a new translation table in several 5ESS machines. The
erroneous change caused all local traffic to be routed to AT&T,
instead of handled locally.
During the outage, I was able to successfully dial a nearby office.
The call sounded very noisy, as if it were going through a very long
path. Dial tone was instantaneous. Most calls encountered a weak and
distant reorder tone.
Are translation table changes implemented in several 5ESS machines all
at the same time? I can see how such an error would cause one CO to
fail, but would it cause multiple CO's to fail at the same time?
Telecommunications Engineering Associates
Daryl Jones, KA6VEP 409 Wildwood Drive
So. San Francisco, CA 94080 Phone: (415) 871-4200
{decwrl,pacbell}!tcomeng!daryl