M320 Flexible Pic Concentrator (Fpc) Description - Juniper M320 Hardware Manual

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M320 Flexible PIC Concentrator (FPC) Description

Copyright © 2010, Juniper Networks, Inc.
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M320 Router Description on page 3
M320 Host Subsystem Description on page 18
M320 Cabinet Size and Clearance Requirements on page 46
Up to eight Flexible PIC Concentrators (FPCs) install vertically in the front of the router
(see Figure 5 on page 12). The FPC slots are numbered left to right from
Depending on the FPC type, an FPC has either two or four slots into which a PIC can be
installed (see "M320 FPCs Supported" on page 14 for more information). An FPC can be
installed into any FPC slot on the router, regardless of which PICs it contains.
If a slot is not occupied by an FPC, an FPC blank panel must be installed to shield the
empty slot and to allow cooling air to circulate properly through the router.
Each FPC consists of the following components:
FPC card carrier, which includes the PIC slots.
One Packet Forwarding Engine consisting of Layer 2/Layer 3 Packet Processing ASICs,
Switch Interface ASICs, Internet Processor ASICs, and an MMB, which includes the
Queuing and Memory Interface ASICs.
Midplane connectors and power circuitry.
Processor subsystem (PMB), which includes a 288-MHz CPU, system controller, 256 MB
of SDRAM, and two Fast Ethernet interfaces.
Two LEDs, located on the craft interface above the FPC, that display the status of the
FPC. For more information about the FPC LEDs, see "M320 Craft Interface FPC LEDs
and Online/Offline Buttons" on page 32.
FPC online/offline button, located on the craft interface above the FPC.
The Packet Forwarding Engine receives incoming packets from the PICs installed on the
FPC and forwards them through the switch planes to the appropriate destination port.
Each FPC contains a memory subsystem (MMB) that is managed by the Queuing and
Memory Interface ASICs.
FPCs are hot-removable and hot-insertable, as described in "M320 FRU Description" on
page 137. When you install an FPC into a functioning router, the Routing Engine downloads
the FPC software, the FPC runs its diagnostics, and the PICs, housed on the FPC, are
enabled. Forwarding continues uninterrupted during this process. When you remove or
install an FPC, packet forwarding is not affected. For FPC replacement instructions, see
"Replacing an M320 FPC" on page 175.
Chapter 2: M320 Hardware Components
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