Juniper Networks J2320 manual Preparing for Router Installation

Chapter 5: Preparing for Router Installation

■J2350 routers—minimum 15 A (–48 VDC)

■J4350 and J6350 routers—minimum 25 A (–48 VDC)

If the J6350 router contains redundant DC power supplies, one power supply must be powered by a dedicated power feed derived from feed A, and the other power supply must be powered by a dedicated power feed derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.

Most sites distribute DC power through a main conduit that leads to frame-mounted DC power distribution panels, one of which might be located at the top of the rack that houses the router. A pair of cables (one input and one return) connects each set of terminal studs to the power distribution panel.

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 terminal studs on each power supply.

WARNING: Power plant ground and chassis ground must be connected to the same building ground.

CAUTION: Before router installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router.

Each DC power cable (–48 VDC and return) must be 14 AWG single-strand wire cable, or as permitted by the local code. Each lug attached to the power cables must be a ring-type, vinyl-insulated TV14-6R lug, or equivalent.

NOTE: Power cords and cables must not block access to router components or drape where people might trip on them.

For information about the DC power supply, see “J2320 and J2350 Services Router Hardware Features” on page 13 and “J4350 and J6350 Services Router Hardware Features” on page 26.

To connect the DC power cable during initial installation, see “Connecting DC Power” on page 124.

To replace a DC power cable, see “Replacing DC Power Supply Cables” on page 196.

Power Guidelines, Requirements, and Specifications ■ 109