Connect Power To A Dc Router - Juniper ACX5448 Quick Start Manual

Universal metro router

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Route the power cord appropriately. Verify that the power cord does not block the air exhaust and access to router components,

or drape where people could trip on it.

Power on the power supply at source.

10.

Repeat Step

through Step

11.

Figure 17: Connecting an AC Power Cord to an ACX5448

Connect Power to a DC Router

Table 3

gives the DC power system input voltage for the ACX5448 router.

Table 3: ACX5448 DC Power System Input Voltage

Item

DC input voltage

To connect power to a DC router:

Attach the grounding strap to your bare wrist and to a site ESD point.

Verify that the DC power cables are correctly labeled before making connections to the power supply. In a typical power

distribution scheme where the return is connected to chassis ground at the battery plant, you can use a multimeter to verify

the resistance of the –48V and RTN DC cables to chassis ground:

The cable with very low resistance (indicating a closed circuit) to chassis ground is positive (+) and will be installed on the

V+ (return) DC power input terminal.

The cable with very high resistance (indicating an open circuit) to chassis ground is negative (–) and will be installed on the

V– (input) DC power input terminal.

CAUTION:

You must ensure that power connections maintain the proper polarity. The power source cables might

be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color

coding used by the external DC power source at your site determines the color coding for the leads on the power

cables that attach to the DC power input terminals on each power supply.

Ensure that the input 2-pole circuit breaker is open so that the voltage across the DC power source cable leads is 0 V and that

the cable leads do not become active while you are connecting DC power.

NOTE:

The V+ terminals are referred to as +RTN, and V– terminals are referred to as –48 V in DC Power Wiring

Sequence Warning.

for the installing the remaining power supply.

Specification

Rated operating voltage: –48 VDC to –60 VDC

Operating voltage range: –40.8 VDC through –72 VDC

ACX5448 Universal Metro Router Quick Start Guide

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