Juniper T4000 Hardware Manual page 35

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Copyright © 2013, Juniper Networks, Inc.
On receipt of each bandwidth grant, the originating Switch Interface ASIC sends a
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cell through the switch fabric to the destination Packet Forwarding Engine.
The destination Switch Interface ASIC receives cells from the switch fabric. It extracts
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the route lookup key from each cell, places it in a notification, and forwards the
notification to the T Series Internet Processor.
The T Series Internet Processor performs the route lookup, and forwards the
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notification to the Queuing and Memory Interface ASIC.
The Queuing and Memory Interface ASIC forwards the notification, including next-hop
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information, to the Switch Interface ASIC.
The Switch Interface ASIC sends read requests to the Queuing and Memory Interface
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ASIC to read the data cells out of memory, and passes the cells to the Layer 2/Layer
3 Packet Processing ASIC.
The Layer 2/Layer 3 Packet Processing ASIC reassembles the data cells into packets,
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adds Layer 2 encapsulation, and sends the packets to the outgoing PIC interface.
The outgoing PIC sends the packets out into the network.
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System Architecture Description for T Series Routers on page 7
Routing Engine Functions for T Series Routers on page 8
Chapter 2: T4000 Router System Architecture Overview
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