Power Supply - Cisco 7000 Series Hardware Installation And Maintenance Manual

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Global lock arbitration—Arbitrates interface processor and SP requests for the global lock, a
synchronization primitive used to control SP and interface processor access to shared data
structures.
Slots in the arbiter cover allow secondary airflow and natural convection to cool the arbiter, which
is outside the primary path of cooling air through the chassis. The chapter "Maintenance" provides
replacement instructions for the arbiter.

Power Supply

The Cisco 7010 comes equipped with one 550W, AC-input power supply (shown in Figure 1-4) or
one 600W, DC-input power supply. The AC-input power supply operates on AC-input power and
supplies DC power to the internal components. The DC-input power supply operates on DC input
power and supplies DC power to the internal components. Table 1-2 lists the acceptable AC-input
and DC-input ranges and the internal operating DC voltages and current levels.
At the noninterface processor end of the router, two handles on the power supply provide grip points
for pulling the power supply out of the chassis. (See Figure 1-4.) Two Phillips-head screws secure
the power supply to the chassis interior. The power supply delivers DC power to the internal
components through a wiring harness that plugs into a polarized receptacle to the noninterface
processor side of the backplane. An aluminum cover shields the harness and power connection. The
backplane distributes the DC voltages to the fan tray, arbiter, and interface processor bus connectors.
The AC power receptacle (or DC-input terminal block), power on/off switch, and status LED are on
the interface processor end of the power supply. A modular power cord connects the AC power
supply to the site power source. A cable retention clip on the power supply AC receptacle prevents
the cable from being pulled out accidentally. The DC-input is supplied by a three-lead, 10 AWG
cable you provide. Strain relief consists of nylon cable ties that you also provide.
The power switch turns the power supply on and starts the system. To the left of the power switch
and receptacle cutout is a ground screw that provides a chassis ground connection for
ESD-preventive equipment or a grounding wire. Figure 1-5 shows the AC power supply from the
interface processor end of the router.
Figure 1-5
On/off
power switch
AC-Input Power Supply
AC power
receptacle
Chassis
ground
DC OK
power indicator
Power supply
Physical Description
Product Overview 1-7