 tschmidtPremium,MVM
join:2000-11-12
Milford, NH
kudos:8
 ·G4 Communications
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| reply to 49528867
Re: Running dedicated line for DSL said by 49528867:AUTOVON utilized Multitone Frequency (MF) signaling which consisted of a 4x4 keypad to out-pulse the dialed digits, these tones could often be heard on operator assisted long distance calls, MF signaling predates DTMF and was used by operators to place calls intratrunk calls.
The Blue Box generated the 2600 Hz tone used to signal trunk idle. Prior to development of SS7 call processing information was carried on the same circuit as the call. This made system vulnerable to hacking. After simulating trunk idle trunk another call could be placed.
As far as I know AUTOVON used normal DTMF phones sets. I was in the military in the 1960's so used the system but never any of the 16-button sets.
/tom |
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 49528867Premium
join:2010-04-16
Fort Lauderdale, FL
kudos:3 | said by tschmidt:The Blue Box generated the 2600 Hz tone used to signal trunk idle. /tom With 16 buttons it did well more then 2600.
As far as I know AUTOVON used normal DTMF phones sets. I was in the military in the 1960's so used the system but never any of the 16-button sets. It used what looked like normal sets (the four extra buttons where not required for call setup/knockdown) but the tones generated where MF not DTMF as that was supposedly more secure than DTMF signaling.
In reality it was probably fostered off on the military by AT&T who built the system.
Ever seen the little huts that provided access to the nuclear hardened coaxial/carrier cables that made up the backbone of that system?
Also remember AUTOVON was not restricted to wire line as it was interconnected with the combat ciders and using a simple TT dial for signaling on such a system was not considered secure.
Like MF was really all that secure. 
There’s an entry point a little south of here in Pensucco (s) prior to passing on a friend of mine used to work down there after it was decommissioned and became part of WOM want to bet some of those the sets are still down in the subterranean bunker under that 6 foot thick poured concrete roof.
Wayne
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A tree full of trained monkeys have my back. |
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49528867Premium
join:2010-04-16
Fort Lauderdale, FL
kudos:3 | reply to tschmidt
said by tschmidt:Prior to development of SS7 call processing information was carried on the same circuit as the call. That’s why it was known as in-band signaling, the call setup/teardown was over the same trunk as the call itself whereas SS7 utilizes interoffice signaling trunks and is an out-of-band signaling system and yes I am quite familiar with SS7 and its protocols.
Wayne
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A tree full of trained monkeys have my back. |
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