Latency question

[omw]

What are the latency differences between ethernet over SFP+ optic cables and ethernet over standard (twisted pair) ethernet cables?

For example, what would the latencies of each of the following look like?:

• 1 meter SFP+ multimode optic cable
• 1 meter standard Cat.6 ethernet cable

Thanks in advance for any information.

 

[sfx2000]

Pretty much the same - all things considered equal...

 

[Nullity]

Like sfx implies, normal people should be concerned with other causes of latency.

Propogation latency is only one part of network latency. https://en.m.wikipedia.org/wiki/End-to-end_delay


If you care about the details, you can Google the speed of light over glass and the speed electricity over wire.

 

[Cloud200]

10GBaseT : 1.6usec on RX, 0.6usec on TX
10G SFP+ : 0.3usec on RX, 0.3usec on TX

Information is based on testing from Mellanox.
Different devices will have different results . . . but a good rule of thumb is for storage IO, SFP+ usually has half the latency of using 10GBase-T