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From: thomas%mvac23.uucp@udel.edu (Thomas Lapp)
Newsgroups: comp.dcom.telecom
Subject: RE: Strange CO
Message-ID: <8735@accuvax.nwu.edu>
Date: 7 Jun 90 01:57:26 GMT
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X-Telecom-Digest: Volume 10, Issue 418, Message 8 of 10


> Back in '76 or '77, I remember the Los Alamos Monitor (the local
> paper) doing a special article on White Rock's new CO.  Mountain Bell
> was using an experimental new technique called `hot slide in' to
> install the new hardware, which (I think) entailed activating the new
> CO, removing the old CO from the building, and sliding the new CO
> hardware into the building *while it was in use*.  I remember

The time frame sounds about right.  In the local CO which covered the
area where I grew up (Morgantown, WV), they replaced a large SxS
switch (which took up the whole inside of a brick building) with a new
ESS switch.  The new switch was much smaller than the old, but there
was still no room in the building for the new switch.  So they built a
separate out-building which was butted up against the old one and
installed the new switch in it.  They then cut over to the new switch,
which was still located outside of the old building, and when they had
cleared enough of the old SxS system out, they did a 'hot slide' as
you describe, to put the new switch into the old building (after
knocking out the wall that separated the two buildings).  If I recall
correctly, the new switch had long enough cables so that it could
indeed be moved on compressed air while in use.

                         - tom

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