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Table 38: Estimated Values for Factors Causing Link Loss
Link-Loss Factor
Modal and chromatic
dispersion
Connector
Splice
Fiber attenuation
Clock Recovery Module
(CRM)
NOTE: For information about the amount of signal loss caused by equipment and other
factors, see your vendor documentation for that equipment.
2. Calculate the (P
) by subtracting (LL) from (P
M
P
– LL = P
B
M
13 dBm – 0.5 dBm [HOL] – 5 (0.5 dBm) – 2 (0.5 dBm) – 2 km (1.0 dBm/km) – 1 dB [CRM] = P
13 dBm – 0.5 dBm – 2.5 dBm – 1 dBm – 2 dBm – 1 dBm = P
P
= 6 dBm
M
Estimated Link-Loss Value
Multimode—None, if product
of bandwidth and distance is
less than 500 MHz/km
Single mode—None
0.5 dBm
0.5 dBm
Multimode—1 dBm/km
Single-mode—0.5 dBm/km
1 dBm
):
B
(Continued)
Sample Link-Loss Calculation Values
0 dBm
0 dBm
This example assumes five connectors. Loss for
five connectors: 5 (0.5 dBm) = 2.5 dBm.
This example assumes two splices. Loss for two
splices: 2 (0.5 dBm) = 1 dBm.
This example assumes the link is 2-km long. Fiber
attenuation for 2 km: 2 km (1 dBm/km) = 2 dBm.
This example assumes the link is 2-km long. Fiber
attenuation for 2 km: 2 km (0.5 dBm/
km) = 1 dBm.
1 dBm
M
100
M
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