-C H A P T E R

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:

Card cage for the rear transition cards

Front-access cable (only for front-access DC models)

Four DC power distribution units or one AC power entry module

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.

Chassis Physical Specifications


	U.S.	Metric
Width	17.5 inches	444.5 mm
Depth--DC model:
Default configuration, with rackmount brackets extended as shown in FIGURE 2-1	15.8 inches	400 mm
With rackmount brackets flush against the bottom of the chassis	13.8 inches	350 mm
Depth--AC model:
Default configuration, with rackmount brackets extended as shown in FIGURE 2-2	18.3 inches	465 mm
With rackmount brackets flush against the bottom of the chassis	16.3 inches	415 mm
Height	21 inches	533.6 mm
Weight (empty)	74 lbs	33.6 kg
Weight (fully-loaded)	150 lbs	68 kg

FIGURE 2-1 Physical Specifications for the Netra CT Chassis, DC model

Figure showing the physical specifications for the Product Name chassis, DC model. Same specifications are also given in TABLE 2-1.

FIGURE 2-2 Physical Specifications for the Netra CT Chassis, AC model

Figure showing the physical specifications for the Product Name chassis, AC model. Same specifications are also given in TABLE 2-1.

Power is supplied to the servers installed in the chassis differently, depending on whether the servers are AC- or DC-powered.

Determining If You Have AC- or DC-Powered Servers and Chassis

DC-Powered Chassis and Servers

AC-Powered Chassis and Servers

Determining If You Have AC- or DC-Powered Servers and Chassis

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).

FIGURE 2-3 Locating the Power Supply Unit Label in the Netra CT Servers

Figure showing the AC or DC label on the power supply unit.

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.

FIGURE 2-4 AC Connectors on a Netra CT Chassis

Figure showing the AC connectors at the rear of a Netra CT chassis.

FIGURE 2-5 DC Connectors on a Netra CT Chassis

Figure showing the DC connectors at the rear of a Netra CT chassis.

DC-Powered Chassis and Servers

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).

FIGURE 2-6 Power Distribution Units and Power Supply Units

Figure showing the locations of the power supply units and power distribution units in the Netra CT servers and chassis.

AC-Powered Chassis and Servers

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.

FIGURE 2-7 AC Connectors on a Netra CT Server Chassis

Figure showing the AC power entry unit and AC connectors at the rear of the Netra CT chassis.