Table 47: Estimated Values for Factors Causing Link Loss (continued)
Sample Link Loss (LL) Calculation Values
Estimated Link Loss Value
Link-Loss Factor
This example assumes the link is 2 km long. Fiber
attenuation for 2 km: 2 km (1 dBm/km) = 2 dBm.
Multimode—1 dBm/km
Fiber attenuation
This example assumes the link is 2 km long. Fiber
attenuation for 2 km: 2 km (0.5 dBm/km) = 1 dBm.
Single-mode—0.5 dBm/km
1 dBm
1 dBm
Clock Recovery Module
(CRM)
NOTE:
For information about the actual amount of signal loss caused by equipment and other
factors, see your vendor documentation for that equipment.
2. Calculate the (P
M
) by subtracting (LL) from (P
B
):
P
B
– LL = P
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
M
13 dBm – 0.5 dBm – 2.5 dBm – 1 dBm – 2 dBm – 1 dBm = P
M
P
M
= 6 dBm
The calculated power margin is greater than zero, indicating that the link has sufficient power for
transmission. Also, the power margin value does not exceed the maximum receiver input power. Refer
to the specifications for your receiver to find the maximum receiver input power.
SEE ALSO
Understanding Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion
124
Summary of Contents for MX10008
Page 1: ...MX10008 Universal Routing Platform Hardware Guide Published 2019 11 11 ...
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Page 278: ...5 CHAPTER Troubleshooting Hardware Restoring Junos OS 283 Alarm Messages 287 ...
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Page 318: ...Restricted Access Warning 321 ...
Page 333: ...Jewelry Removal Warning 336 ...
Page 336: ...Operating Temperature Warning 339 ...
Page 345: ...DC Power Disconnection Warning 348 ...
Page 349: ...DC Power Wiring Sequence Warning 352 ...
Page 352: ...DC Power Wiring Terminations Warning 355 ...
Page 361: ...Translation The emitted sound pressure is below 92 dB A per GR63 CORE 364 ...