Reset CentOS to Factory Default

# Get all yum commands previously run
yum history list all
# Get the details of the command
yum history info [entry number]
# Undo each command top-down
yum history undo [entry number]

Green – Frames within the CIR / CBS compliance level.
Yellow – Frames exceeding the CIR/CBS but are within the EIR/EBS.
Red – Dropped frames

CIR (Committed Information Rate)
EIR (Excess Information Rate)PIR (Peak Information Rate), is the sum of CIR and EIR.

(ITU) standards, with CWDM using a wider spacing between channels of 20nm, compared to the more tightly packed spacing of DWDM at 0.8nm or 0.4nm.
This means that CWDM can support up to 18 channels and with DWDM it is possible to fit 40, 80 or up to 96 channels on the same fiber pair.

The channels on CWDM are located on frequencies between 1271nm to 1611nm, whereas for DWDM the “C-band” 1530nm – 1565nm frequency range is most commonly used as the light has a lower attenuation in optical fiber at this frequency and can travel further.

Bandwidth:
CWDM up to 100GHZ
DWDM 400/800 GBPS.