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    T320 Core Router Overview

    The T320 router provides 320-Gbps throughput and 385-Mpps forwarding rate and supports 16 10-Gbps (OC192c/STM64 and 10-Gigabit Ethernet) ports, as well as OC48c/STM16 for medium and large core networks, as well as for intermediate core aggregation of access routers, peering, and metro Ethernet network applications, such as those supported by Internet service providers (ISPs). It provides a cost-effective migration path to an MPLS infrastructure. The T320 router supports the Junos Operating System (OS), which provides router configuration and monitoring. Figure 1 and Figure 2 illustrate the front and rear of a T320 router..)

    Figure 1: Front View of the T320 Router

    Front View of the T320
Router

    Figure 2: Rear View of the T320 Router

    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 OC12c/STM4, OC48c/STM16, OC192c/STM64, and Tunnel services. For more information on PICs used in the router, see the T320 Core 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 I²C controllers.

     

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    Published: 2012-08-20