M40E Fpc Function; M40E Fpc Slots - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide

M40e FPC Function

M40e FPC Slots

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uninterrupted during this process. For FPC replacement instructions, see "Replacing an
FPC in an M40e Router" on page 191.
M40e FPC Function on page 14
M40e FPC Slots on page 14
M40e FPC Components on page 15
Identifying M40e FPCs on page 16
Flexible PIC Concentrators (FPCs) house the PICs that connect the router to network
media (for information about PICs, see "M40e PICs Description" on page 12). The main
function of an FPC is to connect the PICs installed in it to the other router components.
An I/O Manager ASIC on the FPC divides each incoming data packet into 64-byte cells
and passes the cells through the midplane to the SFM, where another ASIC decides how
to distribute them among the memory buffers located on and shared by all installed
FPCs. After the SFM decides how to forward a packet, an I/O Manager ASIC on the FPC
reassembles the corresponding data cells back into network-packet form and passes
the packet to the appropriate PIC for transmission to the network. For more information,
see "M40e Packet Forwarding Engine Architecture" on page 60.
Up to eight FPCs install vertically into the midplane from the front of the chassis. The
FPC slots are numbered from
one or up to four PICs, depending on the type of FPC and PIC. The PIC slots in each FPC
are numbered from 0 (zero) through
FPC slot, regardless of the PICs it contains, and any combination of slots can be used. If
a slot is empty, you must install a blank FPC panel to shield it, so that cooling air can
circulate properly throughout the card cage.
Figure 5 on page 15, which shows a chassis with an FPC in slot
FPC panels to show the position of the FPC in the card cage.
to , left to right. Each FPC accommodates either
FPC0 FPC7
3 , top to bottom. An FPC can be installed into any
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, omits the blank
FPC0