There is no relationship.Dear Team,
May I know the relation between Gigabits and Gigahertz.
Is 1 Gigabit is equal to 1 Gigahertz.
Bits and clocks are not necessarily related to each other. You also have to look at the implementation of the physical layer to understand the relationship between symbols and bits per symbol on the wire. They do crazy stuff to pack bits into symbols.Hi,
For Gigabit Ethernet what is the Nyquist frequecy.
I have seen in many places instead of clock speed people are telling Gigabit,Mbit etc.If there is a way to obtain frequency
from this it is well and good.
The Nyquist frequency refers to the minimum sampling rate for the highest frequency of a sampled-data analog signal.For Gigabit Ethernet what is the Nyquist frequecy.
Hi ,The Nyquist frequency refers to the minimum sampling rate for the highest frequency of a sampled-data analog signal.
Ethernet is not a sampled data signal, it simply transmits a digital signal using a specific protocol, so the question is not answerable.
Hi Mrchips,Ah, Gigabit Ethernet, if that is what you meant.
Gigabit Ethernet refers to transmission rates of 1000Mbit per second. This is not the same as 1GHz because various encoding and modulation schemes are used to pack the data.
My point is that there is not a general case. The relationship between symbol and bit rates varies depending on the physical medium and encoding.Hi
In my previous posts I mentioned ethernet just as an example.
My intention is to get clock frequency when some says my speed is Xgigabits
Hi Michael,Gigabit Ethernet over copper wiring uses all for pair in full duplex (each pair in both directions at the same time).
So it's 2 bits/symbol * 125 megabaud symbols/pair * 4 pair -> 1000 megabits/second.
It's a bit complex starting with the echo cancellation which allows using each pair in both directions at the same time along with
a lot of coding (the bits aren't sent directly but groups of bits are coded into longer groups and more).
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