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AS THE USER TRAVELS FROM OPIE CELL TO THE NEXT, THE MTSO COMPUTER AUTOMATICALLY <br />SWITCHES THE CALL IN PROGRESS TO THE ADJACENT CELL. <br />MTSO <br />Flg. 2.9 Handoff of call In progress. <br />ALL OF THE ABOVE TRANSMISSION TAKES PLACE AS RAPIDLY AS WOULD THE PLACING OF A <br />CALL FROM A HOME OR OFFICE TELEPHONE. AND AS THE HAND —OFF TAKES PLACE FROM ONE <br />CELL TO THE NEXT, THE USER IS TOTALLY UNAWARE OF THE TRANSFER. <br />To TERMINATE THE CALL, THE USER SIMPLY PRESSES THE "END" KEY, OR IN SOME <br />INSTANCES RETURNS THE HANDSET TO THE BRACKET IN WHICH IT IS HELD. <br />To RECEIVE A CELLULAR TELEPHCNE CALL <br />THE CELLULAR TELEPHONE USER'S CONTROL UNIT MUST. BE IN THE "ON" MODE. <br />TO PLACE A CALL FROM A LANDLINE TELEPHONE UNIT TO A CELLULAR MOBILE UNIT, THE <br />CALLER SIMPLY DIALS THE NORMAL TELEPHONE NUMBER OF THE PARTY WITH WHOM THEY WISH <br />TO SPEAK. THE LAND TELEPHONE SWITCHING OFFICE RELAYS THE CALL TO THE MTSO. THE <br />MTSO SEARCHES THE ENTIRE CELLULAR SYSTEM TO LOCATE THE SPECIFIC MOBILE UNIT. <br />THE MTSO IDENTIFIES THE CELL CLOSEST TO THE STRONGEST SIGNAL AND ALLOWS THE CALL <br />TO BE TRANSMITTED FROM THAT PARTICULAR CELL'S ANTENNA TO THE MOBILE UNIT. <br />AS LONG AS THE CELLULAR MOBILE EQUIPMENT IS IN THE "ON" POSITION, THE MOBILE <br />PHONE WILL RING AND THE CALL IS ANSWERED BY PRESSING THE RELEASE SWITCH AND <br />LIFTING THE UNIT'S HANDSET. <br />—5— <br />49 <br />