Juniper G10 CMTS, Hardware Manual

Page: 176 / 210

Power Supplies
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JUNOSg 3.0 G10 CMTS Hardware Guide 160
If the CMTS is not operating in a power-redundant configuration, a fault with a single
power-related component might cause the CMTS to shut down.
In the case of AC power, you switch off the power by pressing the rocker switch on the AC
power transition module to the off (O) position. In the case of DC power, the DC power
transition module does not contain a power switch. We recommend that you switch off the
DC power before removing the DC power cord from the DC power transition module
terminal block. Once the power is switched off, you can safely replace the faulty component.
Remove Power Supplies
The power supplies in the G10 CMTS are hot-swappable, which means that the system can
remain powered up while a power supply is being removed or installed.
The following procedure describes the steps required for removing a power supply:
1. Remove the power supply faceplate by pulling the flanges on each side of the faceplate
away from the chassis until the faceplate ball studs are removed from the power supply
faceplate clips.
2. Loosen the upper and lower retainer screws of the power supply.
3. Press down on the ejector release while simultaneously pulling the ejector away from the
power supply (actions #1 and #2 in Figure 44 on page 161). The ejector should rest at
approximately 45° from the faceplate. The power supply is physically and electrically
removed from its connector on the midplane.
4. Slowly slide the power supply out of its bay until it is fully removed from the system
(action #3 in Figure 44).
5. If you are not replacing the power supply, you must install a power supply filler panel to
cover the empty power supply bay. Align the panel over the bay opening so that the two
self-contained screws are on the left side of the panel when installed in the chassis (see
Figure 5 on page 12). Apply 3 in-lb of torque to each of the two screws.
If a fault does occur within a non-redundant configuration,
we strongly recommended that you immediately switch
off the power to the CMTS for safety purposes.
Before you hot-swap a power supply, ensure at least five
operating power supplies remain in the chassis after you
remove the faulty power supply. Otherwise, power down
the CMTS before removing the faulty power supply.