C H A P T E R 2 |
Chassis Description |
The Netra CT chassis is designed to be mounted in a 19-inch rack. You can purchase optional adaptors that enable you to mount the chassis in a 21-inch, 23-inch, or 600-mm rack.
The Netra CT chassis is rugged enough to withstand environmental hazards--such as excessive heat, earthquakes, and smoke--to which a server in a telco central office might be subjected. It houses the following Netra CT server components:
TABLE 2-1 gives the physical specifications for the DC- and AC-powered chassis. FIGURE 2-1 shows the DC chassis from the front, and FIGURE 2-2 shows the AC chassis from the front.
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Power is supplied to the servers installed in the chassis differently, depending on whether the servers are AC- or DC-powered.
All of the Netra CT servers installed in a chassis must be either AC or DC; do not mix AC- and DC-powered servers in the same chassis. Even though there are no differences in most of the components in the AC- and DC-powered servers (such as fans, boards, and drives), the differences in the power supplies and the power connectors restrict you from mixing AC- and DC-powered servers in the same chassis.
The label located between the two silver screws at the base of the each power supply unit tells you whether the servers in the chassis are all AC- or DC-powered (FIGURE 2-3).
You can also determine if a chassis is powered by AC or DC by looking at the connectors at the rear of the chassis. FIGURE 2-4 shows the connectors at the rear of an AC-powered chassis and FIGURE 2-5 shows the connectors at the rear of a DC-powered chassis.
The DC power distribution units are located on the chassis and connect directly to the server's midplane when the server is installed in the chassis. Each DC power distribution unit is a cold-swappable field-replaceable component; however, you must remove the server before you can replace a power distribution unit. A DC input power cable is plugged into the power distribution unit, then the power distribution unit provides power to the accompanying power supply unit in the Netra CT server (see FIGURE 2-6).
The AC power entry unit is located on the chassis, and provides power directly to the AC power supply units in the servers, without going through the midplane. An AC power cable is plugged into each AC connector on the AC power entry unit, then the AC power entry unit distributes power to the accompanying power supply unit in the Netra CT server (see FIGURE 2-7). The AC power entry unit is a cold-swappable field-replaceable component.
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