Redback Networks SmartEdge 100, Hardware Manual, Page: 45 / 98

Connecting the Power Cables
Installing the Hardware 4-11
Install the DC Power Cables
The SmartEdge 100 chassis has connectors for A-side and B-side power cables for power redundancy;
these connectors are located on the rear panel of the chassis. The A- and B-side power cables are connected
to separate A-side and B-side connectors on the external fuse panel or circuit breaker panel. The chassis
requires AWG #12 standard copper wire for the DC power cables.
To install the DC power cables, perform the following steps (see Figure 4-7):
1. Ensure that the circuit breaker toggle switches are set to the off position, which is marked by a stamped
“0” on the chassis rear panel.
2. Attach a DC plug to a pair of DC power cables:
a. Pull the DC power plug from the A-side connector at the rear of the chassis to remove it.
b. Using a slotted screwdriver, loosen the recessed screws in the top of the DC plug and insert the
-48 VDC cable in the plus (–) opening and the return cable in the minus (+) opening.
c. Tighten the screws using 0.5 inch-lbs torque (4.4 Newton-meters) maximum.
3. If you are installing redundant DC power sources, attach the second pair of DC power cables to a second
plug.
4. Insert the A-side and B-side plugs in the connectors on the rear panel of the chassis, so that they are
oriented 180° with respect to each other, as shown in Figure 4-7. The connectors are polarized so that
you cannot insert them incorrectly.
5. Secure the cables to the circuit-breaker shields as shown in Figure 4-7.
Warning Risk of electrical shock. Safe operation of this equipment requires connection to a ground point.
To prevent possible injury from voltages on the telecommunications network, disconnect all
telecommunications network lines before disconnecting the unit from the ground point.
Warning
Risk of electrical shock. This equipment uses –48 VDC power, which can cause shock if
inadequate power sources are connected to it. To reduce the risk, verify that the power sources
for the SmartEdge router meet the power specifications provided in the “Warnings” section in
Chapter 3, “Preparing for Installation,” and ensure that DC power cables meet the
specifications provided in the “Electrical Specifications” section in the same chapter before
connecting the power cables.
Warning Risk of electrical shock. Improper grounding can result in an electrical shock. To reduce the
risk, this equipment must be connected to a protective ground in accordance with the
instructions provided in this guide.
Caution
Risk of equipment damage. A DC-powered system uses –48 VDC power, is powered from a
fuse panel, and can be damaged by overloaded circuits. To reduce the risk, ensure that the fuses
in the external fuse panel are suitably rated for the installation in accordance with the National
Electrical Code (in the United States) or applicable local jurisdiction (outside the United States)
installation requirements.