Juniper Networks M10i manual Interface For 100BaseT RJ-45/RJ-45 Operation Connectors

Appendix D: Cable Specifications

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.

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 “Routing Engine Interface Ports” on page 16.

Table 24 on page 187 lists the specifications for the cables that connect to management ports.

Table 24: Cable Specifications for Routing Engine Management Interfaces

	Cable	Cable/Wire	Maximum	Router
Port	Specification	Supplied	Length	Receptacle
Routing Engine	RS-232 (EIA-232)	One 6-ft (1.83-m)	6 ft (1.83 m)	DB-9 male
console or	serial	length with
auxiliary		DB-9/DB-9
interface		connectors
Routing Engine	Category 5 cable or	One 15-ft (4.57-m)	328 ft (100 m)	RJ-45
Ethernet	equivalent suitable	length with		autosensing
interface	for 100BaseT	RJ-45/RJ-45
	operation	connectors

Cable Specifications for Routing Engine Management Interfaces ■ 187