Preparing For Installation - Cisco 12416 Replacement Instructions Manual

Preparing for Installation

The router must be operated with all its power modules installed at all times for compliance with
Caution
electromagnetic compatibility (EMC) regulations.
The AC-input power subsystem consists of the AC-input power shelf with bays for three AC-input power
supplies. A router ordered with the AC-input power subsystem ships with three AC-input power supplies
(full redundant power) installed in the AC-input power shelf. In the full redundant power configuration,
the three power supplies participate in an N+1 redundant current-sharing scheme in which current
sharing is divided among all three power supplies. If one power supply fails, the system can continue to
operate temporarily on the two remaining power supplies. An optional two-level power shelf is also
available.
The DC-input power subsystem consists of the DC-input power shelf with bays for four DC-input PEMs.
A router ordered with the DC-input power subsystem ships with four DC-input PEMs (full redundant
power) installed in the DC-input power shelf. In the full redundant power configuration, modules A1 and
B1 provide redundant power for system load zone 1 (the upper blower module and the upper card cage);
Modules A2 and B2 provide redundant power for system load zone 2 (the switch fabric card cage, the
lower card cage, and the lower blower module).
Preparing for Installation
Installation preparation is presented in the following sections:
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Safety Guidelines
Before you perform any procedure in this publication, review the safety guidelines in this section to
avoid injuring yourself or damaging the equipment. In addition, review the safety warnings listed in the
Regulatory Compliance and Safety Information for the Cisco 12000 Series Internet Router publication
that accompanied your router before installing, configuring, or maintaining the router.
The following guidelines are for your safety and to protect equipment. The guidelines do not include all
hazards. Be alert.
Safety with Equipment
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Cisco 12016, Cisco 12416, and Cisco 12816 Router Chassis Replacement Instructions
4
Safety Guidelines
Preventing Electrostatic Discharge Damage
Required Tools and Equipment
Related Documentation
Always disconnect all power cords and interface cables before moving the system.
Never assume that power is disconnected from a circuit; always check.
Keep tools and assembly components away from walk areas.
Do not work alone if potentially hazardous conditions exist.
Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
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