42
OLTS-85
5 T
IER
1 L
OSS
T
EST
O
PERATION
R
EFERENCING
METHODS
Three jumper reference method
The dual-ended reference removes the losses at Connection 1,
Connection 2, Connection 3, and Connection 4 from the
measurement.
Three jumper reference for single-mode fiber
Fig. 15 Three jumper reference: single-mode remote and single-mode
loopback
For more information on performing a measurement refer to
.
Reference connector to reference connector mated loss: 0.2 dB
Reference connector to random connector: ISO 14763-3: 0.5 dB,
TIA 568.3/ISO 11801: 0.75 dB
Random to random connector: 0.75 dB
Splice loss: 0.3 dB
Limit
14763-3
= Length of fiber * Loss/km + L
conn2
(0.5 dB – 0.2 dB) + L
conn3
+
L
conn4 +
L
splice5
+ L
conn6
(0.5 dB – 0.2 dB)
= 0.6 dB + Length of fiber * Loss/km (dB) + 0.75 dB + 0.75 dB +
0.3 dB
Limit
TIA/11801
= Length of fiber * Loss/km + L
conn2
(0 dB) + L
conn3
+ L
conn4 +
L
splice5
+ L
conn6
(0 dB)
= Length of fiber * Loss/km (dB) + 0.75 dB + 0.75 dB + 0.3 dB