79 lines
3.2 KiB
Plaintext
79 lines
3.2 KiB
Plaintext
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File : PHONEFREQ.TXT
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Author : Iceman
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BBS : The Banana Republic BBS
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10/04/89 The Good Oil on NZ (CCITT) Phone Tones
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======================================
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These are *not* touch-tone tones; they are used by Telecom *internally*
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for signalling between exchanges. They used to be used to get pulse dial to
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work long-distance, viz:
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Pulse +----------+ Tones +----------+ To rec.
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dial ----->| Exchange |--------------------->| Exchange |----> phone.
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+----------+ +----------+
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Frequencies are:
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Digit: Hz: -> CCITT Numerical code.
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======================
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1 700 + 900
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2 700 + 1100
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3 900 + 1100
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4 700 + 1300
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5 900 + 1300
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6 1100 + 1300
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7 700 + 1500
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8 900 + 1500
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9 1100 + 1500
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0 1300 + 1500
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Code 11 700 + 1700 \ For inward
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Code 12 900 + 1700 / operators
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KP 1100 + 1700 Prime (Start of pulsing)
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KP2 1300 + 1700 Transit Traffic (?)
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ST 1500 + 1700 Start (End of pulsing)
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These are (supposedly) used for international && trunkline signalling.
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This is how operator-assisted long-distance calls work:
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- Call operator pulse dial.
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- Operator hits [KP] (signals start of dialling)
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dials wanted number
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hits [ST] (ringing occurs)
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NB: The connection is made once the number is dialed, but ringing does
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not occur until [ST] is hit.
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This is how the guy in Wellington reckons you call long-dist:
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- Call an 0800 number.
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- Hit [KP]
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- Dial wanted number.
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- Hit [ST]
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To Telecom it looks as though the call goes to the free number.
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Notes: - This will only work with calls to other exchangesas it uses the
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CCITT frequencies.
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- It should be possible to make a cheap exchange-to-exchange call,
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eg Auckland to HBC, then dial out to wherever.
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- You can also do this with subscribers (ie the Auckland ->Hamilton
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mentioned above). The only thing is that the 'intermediates'
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phone will be dead while you are abusing it, but if you call a
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business no. at night it's OK. It will just look like a long
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call to a business in Hamilton at 34c/minute.
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- Don't do this to ordinary people - get businesses/govt agencies
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etc, people that can afford to pay (like stockbrokers etc).
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Source for tech. details:
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The Telecom Library in Wellington.
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-------------------------------------------------------------------------------
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AUTHOR: Iceman
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-------------------------------------------------------------------------------
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Brought to the WORLD by The Banana Republic BBS, Auckland, New Zealand.
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-------------------------------------------------------------------------------
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