Cisco XR 12410 - Manual (Page 185)

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Cisco XR 12410 and Cisco XR 12810 Router Installation Guide
OL-17441-01
Chapter 5 Maintaining the Router
Removing and Replacing AC and DC Power Subsystem Components
Caution Cisco XR 12410 router configured with non-enhanced fabric and a
single power supply and with more than five Engine5 line-cards may
fail to boot during the start-up procedures. To safeguard against this
possibility ensure that the chassis is configured with two power
supplies or configured with the enhanced fabric.