Gigabit Ethernet : Bandwidth(B)=1Gbps , Length of cable =d
Standard Ethernet : Bandwidth(B)=10Mbps , length of cable =2000
Lets take frame size =L and velocity = v
Gigabit Ethernet:
L = 2 * d/v * B -----------------------------(A)
Standard Ethernet :
L = 2 * 2000/v * B -----------------------------(B)
compare A and B..
2 * d/v * 1Gbps = 2 * 2000/v * 10Mbps
d=20 Unit