Juniper J2300 Getting Started Manual page 127

Failure to do so makes the router susceptible to total power failure if one of the
power supplies fails.
The router must be connected to earth ground during normal operation.
The protective earthing terminal on the rear of the chassis is provided
to connect the router to ground.
For DC cable requirements, see "DC Power, Connection, and Power
Cable Specifications" on page 92.
To connect DC power to the router:
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and
1.
connect the strip to the ESD point on the chassis. For more information about
ESD, see "Preventing Electrostatic Discharge Damage" on page 221.
Use a grounding cable to connect the router to earth ground: (For cable
2.
requirements, see "Chassis Grounding" on page 101.)
Verify that a licensed electrician has attached an appropriate grounding
a.
cable lug to the grounding cable.
Connect one end of the grounding cable to a proper earth ground, such as
b.
the rack in which the router is installed.
With a Phillips screwdriver, remove the screw and washer from the PEM
c.
nut at the grounding point on the rear of the chassis.
Place the grounding lug at the other end of the cable over the grounding
d.
point, as shown in Figure 47, Figure 48, and Figure 49.
Secure the cable lug to the grounding point, first with the washer, then
e.
with the screw.
NOTE: A DC power supply in a Services Router becomes grounded when you
connect a grounding cable between the router and earth ground.
For each power supply:
3.
Installing and Connecting a Services Router
Connecting Power
105