SIE-CNTEP-1100002104-2014
LCFS
AV6418 OTDR
147
If the fiber link you are measuring is very short, such like
less than 100m, it is suggested to adopt below test mode
and test condition:
Please set: average test mode, range less than 800m, pulse
width less than 80ns and attenuation of 15dB or 20dB, and
set certain average time.
Setting an attenuation of 15dB may obtain a test trace with
better signal to noise ratio, which is of advantage to make
trace analysis. Setting an attenuation of 20dB may obtain a
smaller test dead zone, but the signal to noise ratio will be
relatively poor, there requires setting a larger average time
to obtain a trace of better noise ratio.
Ø
Near end of the test trace has severe tailing.
Try in case severe tailing is observed on falling edge of
the
near end reflection peak of the test trace:
l
Use absorbent cotton ball with proper amount of
absolute ethyl alcohol to clean the tested fiber end and
optical output port end of OTDR.
l
Adopt smaller pulse width to retest the trace (note:
please select average test mode and set certain average
time here).
l
Under the pulse width currently set, use larger
attenuation to retest the trace (note: please select average
test mode and set certain average time here).
Ø
Distance between event points on test trace is too small.
Página No.159 LCFS
CONVALIDACIÓN DE ERRORES DEL PROCESO:
“ADQUISICIÓN DE OTDR (OPTICAL TIME DOMAIN REFLECTOMETER) – REDES GPON/
FTTH/ SDH"
