Juniper Networks M10i Benutzerhandbuch
for seven connectors (0.5 dB per connector, or 3.5 dB). The power margin (
PM
) is
calculated as follows:
PM = PB – LL
PM = 13 dB – 8 km (0.5 dB/km) – 7 (0.5 dB)
PM = 13 dB – 4 dB – 3.5 dB
PM = 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.
the link has sufficient power for transmission and does not exceed the maximum
receiver input power.
Cable Specifications for Routing Engine Management Interfaces
For management and service operations, you connect the Routing Engine to an
external console or management network through ports on the craft interface. For
information about the ports, see
external console or management network through ports on the craft interface. For
information about the ports, see
ports.
Table 24: Cable Specifications for Routing Engine Management Interfaces
Router
Receptacle
Receptacle
Maximum
Length
Length
Cable/Wire
Supplied
Supplied
Cable
Specification
Specification
Port
DB-9 male
6 ft (1.83 m)
One 6-ft (1.83-m)
length with
DB-9/DB-9
connectors
length with
DB-9/DB-9
connectors
RS-232 (EIA-232)
serial
serial
Routing Engine
console or
auxiliary
interface
console or
auxiliary
interface
RJ-45
autosensing
autosensing
328 ft (100 m)
One 15-ft (4.57-m)
length with
RJ-45/RJ-45
connectors
length with
RJ-45/RJ-45
connectors
Category 5 cable or
equivalent suitable
for 100BaseT
operation
equivalent suitable
for 100BaseT
operation
Routing Engine
Ethernet
interface
Ethernet
interface
Cable Specifications for Routing Engine Management Interfaces
■
187
Appendix D: Cable Specifications