[9335] in cryptography@c2.net mail archive
Re: NYC events and cell phones
daemon@ATHENA.MIT.EDU (t byfield)
Sun Sep 16 19:06:26 2001
Date: Sun, 16 Sep 2001 18:56:23 -0400
From: t byfield <tbyfield@panix.com>
To: Cryptography List <cryptography@wasabisystems.com>
Message-ID: <20010916185623.A20618@panix.com>
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In-Reply-To: <Pine.GSO.3.96.1010913144643.16890D-100000@crypto>; from jdyson@treachery.net on Thu, Sep 13, 2001 at 02:57:12PM -0700
jdyson@treachery.net (Thu 09/13/01 at 02:57 PM -0700):
> > An interesting bit of information: on Tuesday afternoon, to the extend
> > that cellphones operated, GSM encryption was turned off throughout
> > Manhattan. My GSM phone would repeatedly warn me of this on every call I
> > made (or tried to make). As of Wednesday morning, things were back to
> > normal.
this wasn't my experience. between ~noon and ~6, i didn't receive
this warning between houston st (= '0th' st) and 110th; but later
it was *sporadically* turned off around w 110th.
> When the twin towers collapsed, down with them went a number of
> cellular towers. Coverage was immediately diminished (if not blacked
> out). As a result, the 1.9 GHz band used by GSM in the United States was
> likely inaccessible until backup or redundant towers in the area were
> reactivated.
i don't think the relationship was so clear.
however, a very limited sample did suggest that single-band (i.e.,
domestic) phones were working while, side by side, 'world' phones
weren't.
cheers,
t
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