Juniper T1600 Hardware Manual page 35

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the outgoing ports, and the packets are sent to the outgoing port without passing
through the switch fabric (see Step 13).
The Switch Interface ASIC sends bandwidth requests through the switch fabric to the
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destination port. The Switch Interface ASIC also issues read requests to the Queuing
and Memory Interface ASIC to begin reading data cells out of memory.
The destination Switch Interface ASIC sends bandwidth grants through the switch
8.
fabric to the originating Switch Interface ASIC.
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
12.
information, to the Switch Interface ASIC.
The Switch Interface ASIC sends read requests to the Queuing and Memory Interface
13.
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,
14.
adds Layer 2 encapsulation, and sends the packets to the outgoing PIC interface.
The outgoing PIC sends the packets out into the network.
15.
T1600 Router Description on page 3
T1600 Chassis Description on page 14
T1600 Packet Forwarding Engine Architecture on page 9
Chapter 2: T1600 Router System Architecture Overview
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