Viavi SmartClass Fiber OLTS-85, Руководство пользователя, Страница: 44 / 88

44 OLTS-85
5 T
IER
1 L
OSS
T
EST
O
PERATION
R
EFERENCING METHODS
Example loss limit calculation
DUT
• 2 connectors
• 1 splice
• Multi-mode
• Fiber length: 842 m
Settings
• One jumper reference
• Loss per connection: 0.45 dB
• Loss per splice: 0.2 dB
• Cable loss: 3.5 dB/km
Fig. 18 Performing the single-mode or multi-mode measurement
For more information on performing different reference
methods refer to “One jumper reference method” on page 38,
“Two jumper reference method” on page 40, or “Three jumper
reference method” on page 42.
Limit
14763-3
= Length of fiber * Loss/km + L
conn2
(0.3 dB) + L
conn3
+ L
conn4
+
L
splice5
+ L
conn6
(0.3 dB)
= 0.842 km * 3.5 dB/km + 0.3 dB + 0.45 dB + 0.45 dB + 0.2 dB +
0.3 dB = 4.65 dB
Limit
TIA/11801
= Length of fiber * Loss/km + L
conn2
(0.75 dB) + L
conn3
+ L
conn4
+
L
splice5
+ L
conn6
(0.75 dB)
= 0.842 km * 3.5 dB/km + 0.75 dB + 0.45 dB + 0.45 dB + 0.2 dB +
0.75 dB = 5.55 dB
Number of connectors: 2
Number of splices: 1