Figure 13: Rear View of the T320 Router
The router supports three types of FPCs:
•
FPC1—Supports PICs that are also used in the FPC1 of a Juniper Networks M Series
router
•
FPC2—Supports PICs that are also used in the FPC2 of a Juniper Networks M Series
router and T640 router
•
FPC3—Supports higher-speed PICs that are also used in the FPC3 of a Juniper Networks
T640 router
The router can operate with any combination of FPCs installed.
Forwarding operations in the router are performed by the Packet Forwarding Engines.
Each FPC contains one Packet Forwarding Engine. The Packet Forwarding Engines receive
incoming packets from the PICs installed on the FPC and forward them through the
switch planes to the appropriate destination port. Each FPC contains data memory,
which is managed by the Queuing and Memory Interface application-specific integrate
circuits (ASICs).
PICs provide the physical connection to various network media types, receiving incoming
packets from the network and transmitting outgoing packets to the network. PICs for
the T320 router currently support the following network media types: ATM, ATM2, Fast
Ethernet, Gigabit Ethernet, 10 Gigabit Ethernet, SONET/SDH OC3c/STM1, SONET/SDH
29Copyright © 2012, Juniper Networks, Inc.
Chapter 2: T Series Core Routers
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