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   + ----------------------(^Cable Pair Indication^)--------------------- +
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   Its amusing to read about the number of myths that Cable Pair Indication
   has drummed up in it's existance. Most people KNOW the CPI number, yet
   don't know that it is CPI and don't know what it does. People have put
   forward all sorts of suggestions ranging from a coin pulse generator to
   ROUs (Remote Observation Units). None of this is even near the truth
   and the fact is that to the casual phreaker it has little direct use.
   
   The CPI `number' is 176, coupled in with the other B.T SALT test numbers
   for Systems X and Y and the other varying test lines for more primitive
   systems. It, as far as I know, works everywhere in England (I could be
   wrong) and is bascially an automatic Oscillator. 
   
   B.T use Oscillators to identify line cable pairs in CAB or PILLER boxes
   (The green B.T things you find at road sides.). The basic idea is that 
   they apply an oscillating tone to the line from the phone termination
   point in the subscribers house and then go to the nearest CAB box, open
   it and use a standard BT amplifier that they can wave around the box a
   bit making themselves look important and it will start to beep when near
   to the subscribers line. This is because it picks up the tone that the 
   oscillator is giving out. 
   
   Now, B.T have gone a bit hi-tech and instead of wasting man-power, they
   have set up this `176' number that will eliminate the physical use of
   the oscillator because it's all done for them...
   The engineer dials `176 + Full standard code' and, if lines are free he
   will here a series of beeps to identify connection, then he can zip
   round to the CAB box, wave his amplifier around a bit and bing - the line
   has been identified.
   
   This could be useful to tap someones line due to the fact you don't have
   to go anywhere near their house, just their area (it can only be used
   in local area). A side affect it does have it that it engages the
   subscribers line you enter so no calls may be made to that house,
   although calls may be made out without the subscriber ever knowing..
   which could be used with a little imagination to conjour up some pretty
   mean deeds..

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