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Posted by on December 2, 2007, 10:47 am
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> Bell wanted the use of 112+ for customer DDD from SXS areas (both
> Bell and independent) to be replaced with 1+. This would make a
> "symmetric" dial-pattern when future 0+ dialing for operator-
> assisted toll-billing was eventually introduced -- i.e., an
> eleven-digit dial pattern (eight-digits back then for home-NPA
> toll calls, since back then you didn't dial your home-NPA in most
> cases for such home-NPA toll calls).
SxS offices varied greatly in size, complexity, and service features.
The Bell System history describes several ways long distance trunks
were tied into an SxS office, such as whether digits were held and
then passed on or perhaps a high speed trunk immediately ready to
collect the long distance number. Trucks between offices themselves
evolved with technology.
Some SxS offices were remote and all special needs (operator, repair)
had to be handled elsewhere, some were larger and had in house
facilities. This obviously affected trunking for such needs.
Some SxS offices got some front-end or back-end electronics in the
1970s to give a little added push to the system.
Compounding the problem was that many SxS offices used five digits for
local calls and used absorbers. Another issue was future growth,
which was generally high in suburban areas.
Other complexities were ANI and Touch Tone.
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