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Test
Point
Test
When
Why
Where
With
3
Optical
Insertion Loss:
Optical Light
Source and
Optical Power
Meter
During
Construction,
as it requires
an optical
light source
at one end
and an
optical
power meter
at the other.
Such access
requires a
tower climb.
If you have
an OTDR,
skip this test
as an OTDR
result
includes this
measure.
Reveals overall
loss through
the fiber
system. Should
be less than
3dB. If it
passes, move
on. If it fails,
isolate problem
with VFL/OTDR.
If you have an
OTDR, skip this
test as an OTDR
result includes
this measure.
Through one
fiber in a pair
within the
hybrid, thru
the RU jumper
with a
loopback on
RU end of the
jumper, back
down to the
source. If you
have an OTDR,
skip this test as
an OTDR result
includes this
measure.
From the
Bottom
ONA-800 with OTDR CW Light
Source
ONA-800 with USB Optical Power
Meter – MP-60/80
4
Optical Time
Domain
Reflectometry
(OTDR)
During
Construction.
Test both TX
and RX on a
duplex fiber
(up and
back) via a
loopback
fiber placed
at the RU
end. This is
done for
efficiency
(half the
tests)
An OTDR
provides a
much more
detailed
characterization
of the fiber
system.
Problems are
immediately
identified based
on their
distance from
the source
Through one
fiber in a pair
within the
hybrid, thru
the RU jumper
with a
loopback on
RU end of the
jumper, back
down to the
source.
From
the Bottom
OTDR - ONA-800 Front
OTDR – ONA-800 Side
ONA-800 Modules