Pic Components; Flexible Pic Concentrators (Fpcs) - Juniper Internet Router M160 Hardware Manual

M160 Internet Router Hardware Guide
Some PICs, such as selected Gigabit Ethernet PICs, accept small form factor
pluggables (SFPs), which are fiber-optic transceivers that can be removed from
the PIC. Various SFPs have different reach characteristics. You can mix them in
a single PIC and change the combination dynamically. SFPs are hot-removable
and hot-insertable, as described in Field-Replaceable Units (FRUs) on page 4. For
SFP replacement instructions, see "Replace an SFP" on page 190. For information
about PICs that use SFPs, see the M160 Internet Router PIC Guide.
You can install up to four PICs in an FPC. The number of ports on a PIC
depends on the type of PIC. PICs are hot-removable and hot-insertable, as
described in Field-Replaceable Units (FRUs) on page 4. For PIC replacement
instructions, see "Replacing a PIC" on page 179.

PIC Components

Most PICs supported on the M160 router have the following components. For
complete specifications, see the M160 Internet Router PIC Guide. For information
about pinouts for PIC cable connectors, see "Cable Connector Pinouts" on page 269.

Flexible PIC Concentrators (FPCs)

Flexible PIC Concentrators (FPCs) house the PICs that connect the router to network
media (for information about PICs, see "Physical Interface Cards (PICs)" on page
13). 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 "Data Flow through the
Packet Forwarding Engine" on page 52.
Up to eight FPCs install vertically into the midplane from the front of the
chassis. The FPC slots are numbered from
accommodates up to four PICs. The PIC slots in each FPC are numbered from
0
regardless of the PICs it contains, and any combination of slots can be used. If a
14
Packet Forwarding Engine
One or more cable connector ports—Accept a network media connector.
LEDs—Indicate PIC and port status. Most PICs have an LED labeled
the PIC faceplate. Some PICs have additional LEDs, often one per port. The
meaning of the LED states differs for various PICs. For more information, see
the M160 Internet Router PIC Guide.
Offline button—Prepares the PIC for removal from the FPC when pressed. For
the PICs that install on an FPC1, the offline button for each PIC is next to it on
the FPC card carrier. For the PICs that install on an FPC2, the offline button is
on the PIC faceplate. See Figure 6.
(zero) through , top to bottom. An FPC can be installed into any FPC slot,
3
to , left to right. Each FPC
FPC0 FPC7
on
STATUS