| PAIR GAIN SYSTEM
WHAT'S PAIR-GAIN SYSTEM? LIKE IT'S NAME .. IT MULTIPLY THE ONE TRANSFER CHANNEL
OF COT TO FOUR OR EIGHT MAYBE TWELVE LOOPS (IT'S DEPENDED ON SYSTEMS DESIGNER'S
SCHEME) CONNECTED TO THE REMOTE TERMINAL (USER SIDE) .. PLEASE VIEW THE REFERENCE
MODEL AS BELOW DRAWING : 
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