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Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Installation Guide
OL-6256-08
Chapter 1 Overview
Chassis Power System
Note We recommend that you check the air filters once a month. Replace a filter when you notice a significant
amount of dust.
Figure 1-6 Airflow Through 8-Slot Line Card Chassis
The Cisco CRS-1 8-slot line card chassis airflow volumes are:
• Chassis airflow—Up to 900 cubic feet (25,485 liters) per minute
• Power system airflow—Up to 240 cubic feet (6,800 liters) per minute
Chassis Power System
The Cisco CRS-1 8-slot line card chassis is available with AC power distribution units (PDUs) that are
configured for either AC Wye 3-phase, AC Delta 3-phase, or DC wiring. Each PDU has a different Cisco
part number.
AC Wye and AC Delta PDUs basically both require 220 VAC input power:
• AC Wye 3-phase wiring is typically used in Europe and countries where each phase-to-neutral
voltage is approximately 220 VAC; the nominal voltage for the power module is 230 V +/- 10%,
which covers the 220 and 240 voltages that are present throughout Europe.
• AC Delta 3-phase wiring is typically used in the United States, Japan, and other countries where the
phase-to-neutral voltage is approximately 120 VAC and approximately 208 VAC phase to phase.
For DC PDU, there is one type for both nominal -48 VDC and -50 VDC inputs.
Safety Guidelines
Before you perform any procedure in this document, review the safety guidelines in this section to avoid
injuring yourself or damaging the equipment.
122784
Fan
Air enters
PLIM side
Power system
Fan
Air exits MSC and
fabric card side
Front Rear
Air filter