Juniper QFX5200 User Manual

The following sample calculaon for an 8-km-long single-mode link with a power budget (P
B
) of 13 dB
uses the esmated values from Table 34 on page 82. This example calculates link loss (LL) as the sum of
ber aenuaon (8 km @ 0.5 dB/km, or 4 dB) and loss for seven connectors (0.5 dB per connector, or
3.5 dB). The power margin (P
M
) is calculated as follows:
P
M
= P
B
– LL
P
M
= 13 dB – 8 km (0.5 dB/km) – 7(0.5 dB)
P
M
= 13 dB – 4 dB – 3.5 dB
P
M
= 5.5 dB
In both examples, the calculated power margin is greater than zero, indicang that the link has sucient
power for transmission and does not exceed the maximum receiver input power.
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83

Juniper QFX5200 Specifications

General

Brand	Juniper
Model	QFX5200
Category	Switch
Language	English