Juniper MX240 Hardware Manual page 161

Switch fabric interfaces to the chassis
XM ASIC chip, which owns and manages the packet data memory built from external DDR3 memory
chips, the fabric queuing system, a portion of the WAN queuing system, and the host queuing system
LU ASIC chip, which performs all functions relating to header processing including input processing,
route lookup, classification, filtering, policing, accounting, encapsulation, and statistics
Midplane connectors and power circuitry
Processor Mezzanine Board (PMB), which contains the host processor and supporting peripherals.
LED on the AS MCC, which displays the status of the AS MLC
MX240 SCB, Power Supply, and Cooling System Requirements for AS MLC
Each MX240 router requires specific SCB, power supply, and cooling system models to run the AS MLC:
SCB—Enhanced MX Switch Control Board (SCBE-MX). See MX240 SCBE-MX Description for details
Power supply:
2520W AC power supply—Model PWR-MX480-2520-AC
2400W DC power supply—Model PWR-MX480-2400-DC
Power requirement for AS MLC:
AS MCC—191W
AS MXC—259W
AS MSC—50W
Cooling system—Required fans and fan tray models:
Fans:
For AC power supply: PWR-FAN-MX240-ACH-HC-U and PWR-MX240-ACL-HC-U
For DC power supply: PWR-FAN-MX2400-DC-HC-U
Fan tray—FFANTRAY-MX240-HC
SEE ALSO
Replacing an MX240 AS MLC | 366
Replacing an MX240 AS MSC | 370
Replacing an MX240 AS MXC | 374
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