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 the power supply faceplate.
Figure 27 on page 98 shows a typical DC source cabling arrangement.
Figure 27: Typical DC Source Cabling to the M120 Router
WARNING: Power plant ground and chassis ground must be connected to
the same building ground.
Table 56 on page 99 summarizes the specifications for the grounding and power cables,
which you supply. The accessory box shipped with the router includes the cable lugs that
attach to the terminal studs of each power supply (see Figure 25 on page 88). (The cable
lug shown in Figure 25 on page 88 is also used for the grounding the chassis.)
The DC return terminal must be connected to the central office (CO) ground. This common
DC return connection (DC-C), and the –48 VDC connection must both be 8 AWG
single-strand wire cable (minimum).
CAUTION: Beforerouterinstallation begins, a licensed electricianmust attach
a cable lug to the grounding and power cables that you supply. A cable with
an incorrectly attached lug can damage the router.
Copyright © 2018, Juniper Networks, Inc.98
M120 Multiservice Edge Router Hardware Guide
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