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10-14
Network Processing Engine and Network Services Engine Installation and Configuration
OL-4448-12
Chapter 10 Configuration Tasks and Troubleshooting Information
Removing and Replacing an AC-Input or DC-Input Power Supply
WFQ Queues
When there is an increase in ignored packets and in the no buffer count, it is possible that the output
weighted fair queueing (WFQ) queues are too long. To specify the number of dynamic queues to be
reserved for use by the class-default class as part of the default class policy, use the fair-queue
policy-map class configuration command; for example:
policy-map policy9
class class-default
fair-queue 16
queue-limit 20
Removing and Replacing an AC-Input or DC-Input Power Supply
The weight of power supplies installed in a Cisco 7200 series router or Cisco 7200 VXR router might
make it difficult for you to pull the network processing engine from its chassis slot. If this is the case,
first remove the installed power supplies from the chassis, and then remove the network processing
engine. The following sections explain how to remove and replace an AC-input or a DC-input power
supply in a Cisco
7200 series router.
Note The network processing engine is installed above the power supplies in a Cisco uBR7200 series router.
You do not need to remove the power supplies from a Cisco
uBR7200 series router to pull the network
processing engine from its chassis slot.
Caution Do not mix AC-input and DC-input power supplies in the same router.
Removing a Power Supply from a Cisco 7200 Series Router
The steps for removing an AC-input and DC-input power supply from a Cisco 7200 series router are the
same. The two power supplies share the same dimensions and faceplates, except for the AC-input
receptacle on the AC-input power supply and the DC-input lead receptacles on the DC-input power
supply.
To remove an AC-input or DC-input power supply from a Cisco 7200 series router, complete the
following steps:
Step 1 Ensure that the power switch on the power supply is in the off (O) position and input power is
disconnected from the power supply and its power source. (See the
“Removing and Replacing the NPE
or NSE” section on page 9-2.)
Note When powering off the router, wait a minimum of 30 seconds before powering it on again.
Step 2 Using a number 2 Phillips or a 3/16-inch flat-blade screwdriver, loosen the two captive installation
screws on the faceplate of the power supply. (See
Figure 10-1.)
If the router is not installed in a standard 19-inch, 4-post rack or in a telco-type rack, skip to Step 6. If
the router is installed in a rack, determine if any permanent rack fixtures, such as a power strip, are
obstructing access to the power supply. If a rack fixture is obstructing access to the power supply,
proceed to
Step 3.