Figure 5: Front of M40e Chassis with Four-PIC FPC Installed in Slot FPC0
M40e FPC Components
An FPC has the components:
•
FPC card carrier—Houses the ASICs, connectors, and processor subsystem.
•
Two I/O Manager ASICs—Parse Layer 2 and Layer 3 data and perform encapsulation
and segmentation. One I/O Manager ASIC is active, interacting with the active SFM,
while the other is in standby mode, prepared to interact with the standby SFM if it is
installed and becomes active. The active I/O Manager ASIC divides incoming packets
into 64-byte data cells for easier processing, and reassembles the cells for each packet
after the forwarding decision is made for it.
•
Two Packet Director ASICs—Transfer packets between the PICs and the active I/O
Manager ASIC: one directs incoming packets from the PICs to the active I/O Manager
ASIC, while the second directs outgoing packets from the I/O Manager ASIC to the
PICs.
•
Four identical synchronous DRAM (SDRAM) dual inline memory modules
(DIMMs)—Form the memory pool shared with the other FPCs installed in the router.
•
Parity-protected synchronous SRAM (SSRAM)—Stores data structures used by the
I/O Manager ASICs.
•
Processor subsystem—Manages packet handling in the FPC and communication with
the SFM. It is a PowerPC 603e-based CPU with parity-protected DRAM.
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Copyright © 2010, Juniper Networks, Inc.
Chapter 2: M40e Hardware Components
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