Dc Power - Juniper G10 CMTS Hardware Manual

DC Power

Each DC power transition module in the G10 CMTS chassis contains a terminal block for
connecting to a DC power source (see Figure 39 on page 122). Unlike the AC configuration,
the DC power transition modules do not operate independently. Each DC power transition
module supports the power supplies in both domains of the chassis.
To connect the DC power transition modules to their power sources, follow this procedure:
1.
2.
3.
4.
5.
6.
7.
You must supply power from different circuits to domain A
and domain B for power redundancy protection.
The G10 CMTS is shipped with ring lugs that are used to connect the DC power cord to
the DC power transition module terminal block. You must crimp these ring lugs to the
negative (–) and positive (+) wires of the DC power cord in order to properly connect to
the DC power transition module.
We recommend you use 10–12 AWG wires for your power
feeds unless your local safety code states otherwise.
Remove the plastic guard over the DC terminal block by loosening the two fastening
screws until the guard can be removed by sliding it upward and over the two screws (see
Figure 39 on page 122; the guard in this illustration is transparent so that you can see
the terminal block). The guard will be reinstalled in step 7.
Remove the screw from the negative (–) terminal on the terminal block of the DC power
transition module. Insert the screw through the ring lug of the power cord that will be
attached to the negative (–) terminal of the DC power source and tighten the screw into
the negative (–) terminal on the terminal block. Apply 20 in-lb of torque to the screw.
Remove the screw from the positive (+) terminal on the terminal block of the DC power
transition module. Insert the screw through the ring lug of the power cord that will be
attached to the positive (+) terminal of the DC power source and tighten the screw into
the positive (+) terminal on the terminal block. Apply 20 in-lb of torque to the screw.
Connect the other end of the power cord connected to the negative (–) terminal on the
terminal block of the DC power transition module to the negative (–) terminal of the DC
power source in accordance with the manufacturer's specifications.
Connect the other end of the power cord connected to the positive (+) terminal on the
terminal block of the DC power transition module to the positive (+) terminal of the DC
power source in accordance with the manufacturer's specifications.
Replace the plastic guard over the two fastening screws and slide the guard down.
Tighten the screws using a torque of 2.5 in-lb.
Connect to Power Sources
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Install the CMTS 121