54 lines
2.2 KiB
Plaintext
54 lines
2.2 KiB
Plaintext
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Signalling Systems Around the World
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For those of you who have the desire to make international calls, this info may
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be of interest. Thanks to TAP and Nick Haflinger.
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CCITT 1. An old international system, now deceased. Used a 500 Hz tone
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interrupted at 20 Hz (Ring) for 1-way line signals.
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CCITT 2. Proposed "International Standard" that never caught on much.
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Used 600 Hz interrupted by 750 Hz. Still used in Australia,
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New Zealand and South Africa.
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CCITT 3. An early in-band system that uses 2280 for both line and
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register (!!). Used in France, Austria, Poland and Hungary.
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CCITT 4 A variation of 3, but uses 2040 and 2400 for end to end Tx of
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line and register. Used for international Traffic in Europe,
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but cannot be used with TASI (AKA Multiplex or "that dammed
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clipping").
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CCITT 5 This is the most popular, and the one used in the US. 2400 and
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the infamous 2600 are used for link to link (not merely end to
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end line signals. Registers are handled via DTMF (Touchtones).
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Anyone know what 2400 does??
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CCITT 5 bis. Just like above, but a 1850 Hz tone is used for TASI locking
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and transmission of line signals.
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CCITT 6 The newest and worst for phreaks. It uses digital data sent
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out-of-band to control the connection. In other words, the
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connection is made and billing started BEFORE you can get
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control.
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CCITT 5R1 A regional system like 5, but doesn't use the mysterious 2400
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and can't use the multiplexer.
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CCITT 5R2 Probably the interface to AUTOVON, as it uses 120 Hz spaced
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tones for DTMF instead of 200. Also 3825 Hz is the blow-off
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tone instead of 2600.
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The "Extra" tones
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1700 + 700 = Inward Operator
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1700 + 900 = Delay operator, also, in TSPS,STP (a "Zero Plus" call from a coin
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phone)
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1700 + 1100= KP1 (Start recognition of special tones)
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1300 + 1700= KP2 (End recognition of special tones)
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12-85 Data Line. CIS 72767,3207: TWX 650-240-6356
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