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    T640 Core Router Overview

    The T640 Core Router provides 40G capable platform, delivering 640 Gigabits per second (Gbps) of capacity and up to 770 million packets per second (Mpps) of throughput and supports 32 10-Gbps (OC192c/STM64 and 10-Gigabit Ethernet) ports, as well as OC48c/STM16. Gigabit Ethernet, SONET/SDH, and other high-speed interfaces for large core networks and network applications, such as those supported by Internet service providers (ISPs). It provides a cost-effective migration path to an Multiprotocol Label Switching (MPLS) infrastructure. The T640 router supports the Junos OS, which provides router configuration and monitoring. (See Figure 1.)

    Figure 1: T640 Router

    T640 Router

    In a standalone configuration, the T640 router’s maximum aggregate throughput is 320 Gbps, full duplex.

    The T640 router supports two types of Flexible PIC Concentrators (FPCs):

    • FPC2—Rated at 10 Gbps full duplex; supports PICs that are also used in the M160 router.
    • FPC3—Rated at 40 Gbps full duplex; supports higher-speed PICs.

    The T640 router can operate with any combination of FPC2s and FPC3s installed. Each FPC contains one or two Packet Forwarding Engines. The Packet Forwarding Engine consists of Layer 2/Layer 3 Packet Processing application-specific integrated circuits (ASICs), Switch Interface ASICs, T Series Internet Processor ASICs, and a memory subsystem (MMB) which includes the Queuing and Memory Interface ASICs. The Packet Forwarding Engine receives incoming packets from the PICs installed on the FPC and forwards them through the switch planes to the appropriate destination port. Each FPC contains data memory, which is managed by the Queuing and Memory Interface ASICs. Each FPC3 has two Packet Forwarding Engines, and each FPC2 has one Packet Forwarding Engine.

    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 T640 router currently support the following network media types: Gigabit Ethernet, SONET/SDH OC12c/STM4, OC48c/STM16, OC192c/STM64, and Tunnel Services. You can install up to four PICs into the slots in each FPC. For more information on PICs used in the router, see the T640 Core Router PIC Guide.

    The 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 640 million Mpps of forwarding. Five SIBs are installed in the router.

    The host subsystem provides the routing and system management functions of the router. 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.

    ASICs are a definitive part of the router design; these ASICs enable the router to achieve data rates that match current fiber-optic capacity.


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    Published: 2012-08-03