Routing Engine Interface Cable And Wire Specifications For Mx Series Routers - Juniper MX240 Hardware Manual

P = 7 dB
M
The following sample calculation for an 8-km-long single-mode link with a power budget (P
uses the estimated values from
(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 ) is calculated as follows:
M
P = P – LL
M B
P = 13 dB – 8 km (0.5 dB/km) – 7(0.5 dB)
M
P = 13 dB – 4 dB – 3.5 dB
M
P = 5.5 dB
M
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.
Routing Engine Interface Cable and Wire Specifications for MX Series
Routers
Table 88 on page 204 lists the specifications for the cables that connect to management ports and the wires
that connect to the alarm relay contacts.
NOTE: In routers where the Routing Engine (RE) and Control Board (CB) are integrated into a
single board, a CB-RE is known as Routing and Control Board (RCB). The RCB is a single FRU
that provides RE and CB functionality.
Table 88: Cable and Wire Specifications for Routing Engine and RCB Management and Alarm Interfaces
Cable
Port Specification
Routing Engine RS-232
console or (EIA-232) serial
auxiliary cable
interface
Table 87 on page 203 to calculate link loss (LL) as the sum of fiber attenuation
Cable/Wire Maximum
Supplied Length
1.83-m length 1.83 m
with
RJ-45/DB-9
connectors
B
Router
Receptacle
RJ-45 female
204
) of 13 dB