TELECOM Digest OnLine - Sorted: Re: Bell Divestiture

Re: Bell Divestiture

Tony P. (
Tue, 21 Jun 2005 21:38:50 -0400

In article <>, says:

> In a message dated Tue, 21 Jun 2005 01:07:05 -0000,
> (Robert Bonomi) writes:

>> Repeating for the illiterate:

>> 'native' touch-tone operation was substantially cheaper for the telco
>> than was 'native' pulse dialing.

>> They retrofitted dial-to-pulse conversion on SxS switches so that they
>> could 'pre-convert' customers to touch-tone before the switch was
>> converted to native touch-tone dialing.

>> This was a "short-term" expenditure of money now, to maximize
>> "long-term" benefits. By having a significant "installed base" of
>> touch-tone users *already*in*place* when the C.O. was converted to
>> _native_touch-tone_ handling, they could get by with far fewer sets of
>> digit decoders (dial or pulse). With 'pulse' tieing up the decoders
>> for average more than five times as long as touch-tone, there _was_
>> significant benefit to be obtained. getting even 20% of the calls on
>> touch-tone, meant a _halving_ of the number of decoder elements
>> required.

> What was the cost of the touch-tone oscillator for a telephone set,
> vs. the cost of a rotary dial? There were millions of telephone sets
> out there, and at the time that was introduced the phones were
> installed, owned and maintained by the telco. The cost of the
> oscillators (key pads) would be considerable expense, particularly if
> the cost was significantly higher than a rotary dial.

Considering that a rotary dial was nothing but springs and gears,
while a DTMF pad had coils (Bell loved those ferrous cup cores!),
resistors, transistors, specially plated contacts, etc.

But the basics of the phone were just a 500 set with updated housing.
All that really changed was the dial.

But then I stop and think how much effort went into making reliable
rotary dials. They were probably roughly equal in cost using adjusted
dollar amounts.

Post Followup Article Use your browser's quoting feature to quote article into reply
Go to Next message: Robert Bonomi: "Re: Bell Divestiture"
Go to Previous message: "Re: NFL in Talks With Sprint, Others for Wireless Video"
TELECOM Digest: Home Page