Joe wrote:
> Correct, MF tones were used on inter office trunk circuits. These were the
> tones that people used to simulate to dial free toll phone calls. Each
> digit was made up of two tones, but not similar to the Touch Tone
> frequencies. Your taking me back to my old phone company Toll Office days
> and the 17B board.
>
> 73, Joe, k1ike
Of course none of this is really used much anymore, anywhere.
Nowadays, we're using fiber between Offices, and if you can find MF
doing anything, you've found a system in sore need of an upgrade or a
tandem connection to an even older device somewhere the stuff's still
used, usual International circuits.
In-band signaling hasn't been desired or good engineering practice for
many years now.
While system size and complexity continue their downward slide, capacity
in telco keeps going up up up.
The teleconferencing box I work on uses 6 co-ax cabled DS-3's to feed it
(or optionally Fiber and IP/SIP/VoIP). It's a beast. (Reading through
the logs is REALLY fun... um... no. Nevermind...)
It handles 4032 phone calls at the same time in just about any
combination of conferences you like... in a one and a half-foot high box.
The bummer for most carriers is that conferences last a long time,
completely blowing their traffic management folks out of the water.
One of our boxes can utterly crush the inter-machine trunks between the
IXC's and other carriers out of a CO in smaller offices, with too much
traffic that lasts longer than expected for an "average" phone call.
I hear rumor that one of our customers did this to Sprint in the Atlanta
area recently... new system turn-up, Sprint wasn't watching traffic load
carefully enough... all circuits busy out of Atlanta...
Ah well, what'cha expect from a railroad telephone company? (SPRINT =
Southern Pacific Railroad Internal Network & Telephone... or similar.)
Thus, when I signed up for my gmail address a few years ago -- I thought
it appropriate that my address should be:
[EMAIL PROTECTED] ;-)
Nate WY0X
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