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--------- 
GREEN BOX 
---------



------------ 
Introduction 
------------

The Green Box generates useful tones such as  COIN  COLLECT, COIN
RETURN,  and  RINGBACK. These are the tones that ACTS or the TSPS
operator would send to the CO when  appropriate.   Unfortunately,
the  green  box cannot be used at a fortress station, but must be
used by the CALLED party.  The tones (hz) are:


   COIN COLLECT      700  +  1100
   COIN RETURN      1100  +  1700
   RINGBACK          700  +  1700


Before the called party sends any of  these  tones,  an  operator
released  signal  should be sent to alert the MF detectors at the
CO.  This can be done by sending 900 + 1500 Hz or a  single  2600
Hz  wink (90 ms) followed by a 60 ms gap and then the appropriate
signal for at least 900 ms.  Also, do not forget that the initial
rate is collected shortly before the 3 minute period is up.


+++EOF