minimal interframe gaps in gigabit ethernet port

amms68958 · ‎09-01-2006

Hi ,

Whether someone know the minimum interframe gap in gigabit ethernet port in Cisco switch ,3750.

Also ,would like to know the IEEE standard for the same.

Thanks in advance,

Thomas.

gpulos · ‎09-01-2006

the interframe gap for 1-GB is 96 nanoseconds of 96 bit size.

the minimum IFG for is 96 bit times. (the time it takes to transmit 96 bits of data at the specified data rate)

ie:

10Mbps - 9.6 milliseconds

100Mbps - 960 nanoseconds

1000Mbps - 96 nanoseconds

note: you may not want to decrease an IFG smaller than 9.6 microseconds if all other hosts are only capable of 9.6 ms. (10mbps connections)

interframe gap shrinkage could occur to the point where the gap is too small.

if you have a gap that is too small, it will not allow the NIC enough time to switch between TX/RX states and packets could be lost.

please see these links for more IFG info:

rajinikanth · ‎09-01-2006

time gap between two frames in gigabit ethernet port is 96 nanoseconds