OLT-85/OLT-85P
83
13 A
PPENDIX
- R
EFERENCING
M
ETHODS
L
OOPBACK
AND
R
EMOTE
R
EFERENCING
reference test jumper (both directions). The loss at the second
connection that must be present to measure the fiber system
under test will not be referenced out.
By performing a two-jumper reference, the loss at this one
connection is included in the measured loss.
Three jumper cable reference
This reference removes the losses at Connection 1,
Connection 2, Connection 3, and Connection 4 from the
measurement.
Fig. 33 Three jumper reference - unidirectional
Fig. 34 Three jumper reference - bidirectional (switching source and
powermeter mode)
C1
C4
TX
RX
S
P
C2
C3
C1
C4
C1
C4
TX
RX
RX
TX
S
P
P
S
C2
C2
C3
C3
C1
Connection 1
C4
Connection 4
C2
Connection 2
C3
Connection 3
TX
Laser source output (Transmitter)