Juniper Networks J-series Services Router J2320 - Manual (Page 149)

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and
connect the strap to the ESD point on the chassis. For more information about
ESD, see “Preventing Electrostatic Discharge Damage” on page 251.
2. Use a grounding cable to connect the router to earth ground: (For cable
requirements, see “Chassis Grounding” on page 123.)
a. Verify that a licensed electrician has attached an appropriate grounding cable
lug to the grounding cable.
b. Connect one end of the grounding cable to a proper earth ground, such as
the rack in which the router is installed.
c. With a Phillips screwdriver, remove the screw and washer from the PEM
nut at the grounding point on the rear of the chassis.
d. Place the grounding lug at the other end of the cable over the grounding
point, as shown in Figure 65 on page 128 and Figure 66 on page 129.
e. Secure the cable lug to the grounding point, first with the washer, then with
the screw. On J2320 and J2350 routers, use the screw containing a captive
washer to secure the cable lug to the grounding point.
NOTE: A DC power supply in a Services Router becomes grounded when you connect
a grounding cable between the router and earth ground.
3. For each power supply:
a. Ensure that the voltage across the DC power source cable leads is 0 V and
that the cable leads cannot become active in any way during installation.
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.
b. Verify that a licensed electrician has attached the appropriate power cable
lugs to the negative and positive DC source power cables.
c. Use a Phillips screwdriver to remove the clear plastic cover protecting the
terminal block.
d. Within the terminal block, remove the two center screws next to the labels
–48 VDC and RTN .
Each screw contains a captive washer to secure a DC source power cable
lug to the terminal block.
e. Using one of the removed screws, secure the positive (+) DC source power
cable lug to the
RTN terminal. Tighten the screw until snug. Do not
Connecting Power ■ 127
Chapter 6: Installing and Connecting a Services Router