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MX150 3D Universal Edge Router Hardware Guide
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Documentation
Calculating the Fiber-Optic Cable Power Margin for an MX150
68
To calculate the worst-case estimate for fiber-optic cable power budget (P
link:
Determine values for the link's minimum transmitter power (P
1.
sensitivity (P
). For example, here, (P
R
are referenced to 1 milliwatt (dBm).
P
= –15 dBm
T
P
= –28 dBm
R
NOTE:
See the specifications for your transmitter and receiver to find the
minimum transmitter power and minimum receiver sensitivity.
Calculate the power budget (PB) by subtracting (P
2.
–15 dBm – (–28 dBm) = 13 dBm
Understanding MX150 Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion on
page 66
Calculating the Fiber-Optic Cable Power Margin for an MX150 on page 68
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
attenuation or link loss (LL) has been subtracted from the power budget (P
When you calculate the power margin, 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 worst-case
levels. A power margin (P
M
to operate the receiver and that it does not exceed the maximum receiver input power.
This means the link will work. A (P
to operate the receiver. See the specification for your receiver to find the maximum
receiver input power.
Before you begin to calculate the power margin:
Calculate the power budget. See
an MX150" on page
67.
To calculate the worst-case estimate for the power margin (P
Determine the maximum value for link loss (LL) by adding estimated values for
1.
applicable link-loss factors—for example, use the sample values for various factors
) and (P
) are measured in decibels, and decibels
T
R
) is the amount of power available after
M
) greater than zero indicates that the power budget is sufficient
) that is zero or negative indicates insufficient power
M
"Calculating the Fiber-Optic Cable Power Budget for
B
) for the
) and minimum receiver
T
) from (PT):
R
).
B
) for the link:
M
Copyright © 2017, Juniper Networks, Inc.
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