Cisco NCS 4000 Series Hardware Installation page 177

Chassis Overview
• One fan tray
• One external connection unit (ECU) located above the fan tray behind the craft panel
• One fiber management tray at the top of the chassis
• One air inlet and one air outlet
• Eight power modules for redundancy
• The upper four AC or DC power trays (0-3) are contained within power shelf 0 (PS0) and the lower four
AC or DC power trays (4-7) are contained within power shelf 1 (PS1).
The cards have electrical plugs at the back that plug into electrical connectors on the shelf backplane. When
the ejectors are fully closed, the card plugs into the assembly backplane.
The chassis has eight power modules for redundancy:
• The upper four power modules are contained within power tray 0 (PS0). They are named as follows:
PS0-PM0, PS0-PM1, PS0-PM2, and PS0-PM3.
• The lower four power modules are contained within power tray 1 (PS1). They are named as follows:
PS1-PM0, PS1-PM1, PS1-PM2, and PS1-PM3.
Hardware Installation Guide for Cisco NCS 4000 Series
Chassis Slot Numbers
157