Juniper PTX5000, Hardware Manual

Page: 210 / 721

The following sample calculation for an 8-km-long single-mode link with a power budget (P
B
) of 13 dB
uses the estimated values from Table 71 on page 191 . This example calculates link loss (LL) as the sum
of fiber attenuation (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, indicating that the link has sufficient
power for transmission and does not exceed the maximum receiver input power.
PTX5000 Alarm and Management Cable
Specifications and Pinouts
IN THIS SECTION
PTX5000 Alarm Relay Contact Wire Specifications | 192
PTX5000 Management Interface Cable Specifications | 193
RJ-45 Connector Pinouts for the PTX5000 Auxiliary and Console Ports | 194
RJ-45 Connector Pinouts for the PTX5000 Management HOST/ETHERNET Port | 195
PTX5000 Alarm Relay Contact Wire Specifications
For management and service operations, you can connect the PTX5000 to external alarm-reporting
devices through the alarm relay contacts on the craft interface. You must provide a wire with gauge
between 28-AWG and 14-AWG (0.08 and 2.08 mm
2
).
192