specified for the type of link in the Telcordia Technologies document GR-253-CORE (Section 4.3) and
International Telecommunications Union (ITU) document G.957.
When chromatic dispersion is at the maximum allowed, its effect can be considered as a power penalty in
the power budget. The optical power budget must allow for the sum of component attenuation, power
penalties (including those from dispersion), and a safety margin for unexpected losses.
Calculating the Fiber-Optic Cable Power Budget for an MX10016
Calculate the link's power budget when planning fiber-optic cable layout and distances to ensure that
fiber-optic connections have sufficient power for correct operation. The power budget is the maximum
amount of power the link can transmit. When you calculate the power budget, you use a worst-case
analysis to provide a margin of error, even though all the parts of an actual system do not operate at the
worst-case levels.
To calculate the worst-case estimate for the fiber-optic cable power budget (P
B
) for the link:
1. Determine values for the link's minimum transmitter power (P
T
) and minimum receiver sensitivity (P
R
).
For example, here, (P
T
) and (P
R
) are measured in decibels, and decibels are referenced to 1 milliwatt
(dBm):
P
T
= –15 dBm
P
R
= –28 dBm
NOTE:
See the specifications for your transmitter and receiver to find the minimum transmitter
power and minimum receiver sensitivity.
2. Calculate the power budget (P
B
) by subtracting (P
R
) from (P
T
):
–15 dBm – (–28 dBm) = 13 dBm
Calculating the Fiber-Optic Cable Power Margin for an MX10016
Calculate the link's power margin when planning fiber-optic cable layout and distances to ensure that
fiber-optic connections have sufficient signal power to overcome system losses and still satisfy the minimum
input requirements of the receiver for the required performance level. The power margin (P
M
) is the
amount of power available after attenuation or link loss (LL) has been subtracted from the power budget
(P
B
).
118
Summary of Contents for MX10016
Page 1: ...MX10016 Universal Routing Platform Hardware Guide Published 2019 10 15 ...
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Page 239: ...Figure 118 Moving the MX10016 Using a Mechanical Lift g100421 242 ...
Page 240: ...5 CHAPTER Troubleshooting Hardware Restoring Junos OS 245 Alarm Messages 249 ...
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Page 277: ...Restricted Access Warning 281 ...
Page 292: ...Jewelry Removal Warning 296 ...
Page 295: ...Operating Temperature Warning 299 ...
Page 304: ...DC Power Disconnection Warning 308 ...
Page 308: ...DC Power Wiring Sequence Warning 312 ...
Page 311: ...DC Power Wiring Terminations Warning 315 ...
Page 320: ...Translation The emitted sound pressure is below 92 dB A per GR63 CORE 324 ...