Installing Power Supplies - Juniper G10 CMTS Getting Started

Installing Power Supplies

• Installing Power Supplies
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14 Juniper Networks G10 CMTS Getting Started
Before installing a power supply or any module into the
G10 CMTS, attach one end of an ESD ground strap to your
wrist and attach the other end to the ESD strap jack on the
front of the chassis (refer to Figure 2 on page 3).
1. The power supply faceplate must be removed 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. Decide the bay in which the power supply will be inserted. As described in the Juniper
Networks G10 CMTS Functional Description, the midplane is partitioned into two
domains—Domain A (slots 1—6) and Domain B (slots 7, 9—13). The AC power supplies
in each domain are supplied from the power source connected to that domain's AC
power transition module. However, the DC outputs of all ten power supplies in both
domains are interconnected along the midplane. Therefore, if power source redundancy
is not a consideration, adding an AC power supply to either domain will supply
additional power to all of the modules in the chassis. However, if power source
redundancy is desired, the addition of an AC power supply in one domain must be
accompanied with the addition of an AC power supply in the other domain. Within a
domain, a power supply can be installed in any of the available five bays. Figure 7 on
page 16 illustrates the two power supply domains.
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. Therefore, power supply redundancy is independent of the
domain in which a power supply is installed.
3. Remove the power supply filler panel covering the selected bay by loosening the two
self-contained screws.
4. If the power supply's ejector is locked in the vertical position, press down on the ejector
release while simultaneously pulling the ejector away from the power supply. The
ejector should rest at approximately 45° from the faceplate.
The power supplies and the chassis are mechanically
keyed to ensure that same-type supplies and chassis (AC or
DC) are used together. Do not attempt to remove or
reconfigure the keys.
5. Align the printed circuit board of the power supply with the bay card guides and slowly
slide the power supply into the bay until it comes to a stop with the inside tabs of the
ejector (tabs closest to midplane) resting over the power supply ejector rail (refer to
Figure 8 on page 17).
6. Firmly lift the ejector to the vertical position until the ejector release clicks into position.
7. Tighten the upper and lower retainer screws by applying 3 in lb of torque to each screw.