Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
36 !
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 Internet routing node
! FPC3—Supports higher-speed PICs that are also used in the FPC3 of a Juniper
Networks T640 routing node
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 OC12c/STM4, OC48c/STM16, OC192c/STM64, and
Tunnel services. For more information on PICs used in the router, see the T320
Internet Router PIC Guide.
The T320 router supports two DC power supplies, which share the load evenly.
Three Switch Interface Boards (SIBs) provide the switching function to the
destination FPC. The SIBs create the switch fabric for the router, providing up to a
total of 320 million packets per second (Mpps) of forwarding.
Routing and system management functions of the router are performed by the host
subsystem. The host subsystem consists of the Routing Engine and the Control
Board.
The Routing Engine maintains the routing tables used by the router and controls the
routing protocols that run on the router. Each Control Board works with an adjacent
Routing Engine to provide control and monitoring functions for the router. These
include determining Routing Engine mastership, controlling power, reset and
SONET clocking for the other router components, monitoring and controlling fan
speed, and monitoring system status using I
2
C controllers.

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English