...

LA CERTIFICACION EN EL CABLEADO ESTRUCTURADO DE

by user

on
Category:

travel

1

views

Report

Comments

Transcript

LA CERTIFICACION EN EL CABLEADO ESTRUCTURADO DE
Traveling signals is like electrons following a somewhat
rocky path
Propagation delay
Electrons travel at approx.
constant speed
( 20 cm or 8” per ns,
1 ns = 0.000 000 0001 s
NVP * speed of light)
www.networks.pe
(max 555 ns
later ..)
Existen baches en el camino….
Atenuación
(Perdida de inserción)
Calor!
www.networks.pe
Menos
electrones!
Calor!
On top of that: the road is not level and
electrons fly off!
Crosstalk!!
A level problem in the electronic road will cause some electrons to fall
on an adjacent road
www.networks.pe
Near End Crosstalk (NEXT)
Near End Crosstalk is by the electrons that return back to
the beginning
www.networks.pe
Far end crosstalk (FEXT)
Far End Crosstalk is by the electrons that continue to
the far end
www.networks.pe
Combine two effects: attenuation and
NEXT: S/N = ACR
Look
here!
At a receiver input you need more signal electrons than stray electrons
www.networks.pe
Alien Crosstalk
Alien crosstalk occurs between cables
www.networks.pe
Fly UP