How data is transferred through telephone, anlogue or digital, logical & supported answer?

YOU SURE DON'T WANT MUCH DO YOU!

FIRST ANALOG DATA IS THE TALK DATA, THERE IS A CARBON MICROPHONE IN THE PHONE HANDSET WHEN YOU TALK IT CHANGES RESISTANCE AS THE SOUND WAVES HIT IT. NOW THERE IS A DIRECT CURRENT 20 MILIAMP FLOWING THRU THIS IT ALSO FLOWS THRU A NETWORK WHICH IS IN THE BASE OF THE PHONE. YOUR EARPHONE IS MAGNETIC AND IT CONVERTS THE CHANGING IN THE CURRENT BACK INTO SOUND. ANYWAY THE TALK PART OF PHONE, THE ORIGINAL THING PHONES DID IS CARRIED OUT BY DIRECT CURRENT, (BATTERY POWER). THE PHONE RINGS WITH A ALTERNATING VOLTAGE OF 90 VOLTS AT 20 CYCLES PER SECOND. THE BELL IS CONNECTED TO THE LINE THRU AN CAPACITOR WHICH PASSED THE AC BUT DOES NOT PASS THE TALKING DC VOLTAGE. THUS THE BELL DOES NOT MESS UP YOUR TALK!

DIGITAL DATA IS SUPERIMPOSED ON TOP OF THE DIRECT CURRENT AND IT IS A VERY HIGH FREQUENCY! SO THAT IT CAN BE SEPARATED FROM YOUR VOICE FREQUENCY, THUS THERE IS A FILTER WHICH IS INSTALLED AHEAD OF THE PHONE WHICH SEPARATES THE HIGH FREQUENCY DIGITAL FROM THE LOWER FREQUENCY VOICE. THIS HIGH FREQUENCY DIGITAL SIGNAL IS FED INTO THE MODEM AND CONVERTED TO PURE DIGITAL SIGNAL FOR THE COMPUTER.

SO WE HAVE 2 LITTLE WIRES CARRING MANY SIGNALS

1. RINGING SIGNAL AC 20 CYCLES 90 VOLTS
2. TALK SIGNAL DC VOICE FREQUENCY 3-6 VOLTS
3. DIGITAL SIGNAL AC HIGH FREQUENCY

THATS IT.

HOPE I HELPED YOU!


APS

little particles travel thru your phone cable =]