what's the difference between standard and service DCU-60 USB cable

[lifeof29]

Same cable the only diference is the ussless pins 2 3 4 5 6 7 9 12
pin 1 is +3/5v(red)
pin 8 is gnd(black)
pin 10 is tx(white)
pin 11 is rx (blue)

thanks for info