Chapter 1 Product Overview
Physical and Functional Description of Router
Optional AC Power Shelf
The power subsystem consists of a double-level AC-input power shelf with bays for 4 AC-input power supplies. Figure 1-4shows the optional power shelf. It attaches to the top of the router chassis and is secured to the chassis the same way as the standard AC-input power shelf.
Note A router equipped with the optional AC-input power subsystem stands 77.5 inches (196.85 cm) tall and does not fit in a standard 7-foot (2.1 m) rack.
The 4 power supplies in the optional power shelf participate in an N+2 redundant current-sharing scheme in which current sharing is divided among all 4 power supplies. Up to two power supplies can fail and the system can continue to operate temporarily, (depending on your system configuration) using the remaining two power supplies. Failed 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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