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T4000 Router Description


The Juniper Networks T4000 Core Router is a complete routing system that provides Gigabit Ethernet, SONET/SDH, and other high-speed interfaces for large networks and network applications, such as those supported by Internet service providers (ISPs). The T4000 router accommodates up to eight Flexible PIC Concentrators (FPCs), each of which can be configured with a variety of network media types. The router provides up to 2.0 terabits per second (Tbps), full duplex (4.0 Tbps of any-to-any, nonblocking, half-duplex) switching.

The router architecture cleanly separates control operations from packet forwarding operations. This design eliminates processing and traffic bottlenecks, permitting the router to achieve high performance.

  • Control operations in the router are performed by the host subsystem, which runs the Junos operating system (Junos OS) to handle routing protocols, traffic engineering, policy, policing, monitoring, and configuration management.

  • Forwarding operations in the router are performed by the Packet Forwarding Engines, which consist of hardware, including ASICs, designed by Juniper Networks. Application-specific integrated circuits (ASICs) are a definitive part of the router design; they enable the router to achieve data forwarding rates that match current fiber-optic capacity. The T4000 router provides up to a total of 2.4 billion packets per second (Mpps) of forwarding.

Figure 1 and Figure 2 illustrate the front and rear of a T4000 router.

Figure 1: Front View of the T4000 Router
Front View of the T4000 Router
Figure 2: Rear View of the T4000 Router
Rear View of the T4000 Router