Chapter 1 Product Overview
Physical and Functional Description of Router
AC and DC Power Subsystems
A router ships with either an AC or DC powered system. Source power connects to the power shelf at the back of the chassis which route power to the power supplies, also referred to as power entry modules (PEMs).
Standard AC Power Shelf
The standard AC-input power subsystem consists of a single-level AC-input power shelf that house three AC power supplies which supply full redundant power to the router.
The power supplies participate in an N+1 redundant current-sharing scheme that is divided among all three power supplies. If one power supply fails, the system can continue to operate temporarily, (depending on your system configuration) with the remaining two power supplies. Failed power supplies should be replaced as soon as possible to ensure full redundancy.
Caution To ensure that the chassis configuration complies with the required power budgets, use the on-line power calculator. Failure to properly verify the configuration may result in an unpredictable state if one of the power units fails. Contact your local sales representative for assistance.
| Cisco XR 12416 Router Installation Guide |
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