Cisco Systems Cisco 12816 Manuale Utente

ILMI (yellow)—Indicates the PEM is operating in a current-limiting 
condition.

For additional information about troubleshooting AC PEMs, see the 

A DC-input power subsystem consists of a DC-input power shelf that houses 4 
(2000 W or 2400 W) DC PEMs that provide full redundant power to the router. 

 shows a DC-input power shelf housing original series 2000 W power 

supplies.

The Cisco 12416 and 12816 DC powered systems (part numbers GSR16/320-DC 
and GSR16/320-DC) are equipped with 4 PEMs. The chassis is electrically 
divided between the PEMS. These sections are referred to as power zones and are 
labeled accordingly: 

Two PEMs power the upper card cage (Zone 1)

Two PEMs power the lower card cage (Zone 2)

Each zone provides power to one blower, one alarm card, line cards and route 
processor cards.

Zone 2 also supplies power to all switch fabric cards. The result is that there is 
less power available for line cards in Zone 2, limiting the number of high-powered 
line cards that can be configured in the lower cage.

To ensure that the chassis configuration complies with the required power 
budgets, contact your sales representative to provide you with the required 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.

In the DC-input 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).