T640 Routing Node Major Hardware Components ! 41
Chapter 10: T640 Internet Routing Node Overview
Physical Interface Cards (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 routing node 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 routing node,
see the T640 Internet Routing Node PIC Guide.
The Switch Interface Boards (SIBs) provide the switching function to the destination
FPC. The SIBs create the switch fabric for the routing node, providing up to a total of
640 million Mpps of forwarding. Five SIBs are installed in the routing node.
The host subsystem provides the routing and system management functions of the
routing node. The host subsystem consists of the Routing Engine and the Control
Board. The Routing Engine maintains the routing tables used by the routing node
and controls the routing protocols that run on the routing node.
Each Control Board works with an adjacent Routing Engine to provide control and
monitoring functions for the routing node. These include determining Routing
Engine mastership; controlling power, reset, and SONET clocking for the other
routing node components; monitoring and controlling fan speed; and monitoring
system status using I
2
C 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.
T640 Routing Node Major Hardware Components
Table 12 lists the major T640 routing node components and characteristics.
Table 12: T640 Routing Node Major Hardware Components
Component Quantity Function Redundant
Field-
Replaceable
Offline
Button
Connector Interface Panel
(CIP)
1 Provides ports for external management
and alarm relay devices
— Hot-pluggable —
Control Board 1–2 Monitors and controls router components Yes Hot-pluggable Yes
Cooling system 2 front fan
trays,
1 rear fan
tray
Cools router components Yes hot-removable,
hot insertable
—
Craft interface 1 Displays status and provides an interface
for controlling router functions
— Hot-removable.
hot-insertable
—
FPC 1–8 Connect PICs to other router components,
contains Packet Forwarding Engines
— Hot-removable,
hot-insertable
Yes
PIC 1–4 per
FPC
Provides an interface to various network
media
— Hot-removable,
hot-insertable
Yes
Power supply (DC only) 2 Distributes needed voltages to router
components
Yes Hot-removable,
hot-insertable
—
Routing Engine 1–2 Provides routing functions and routing
tables
Yes Hot-removable,
hot-insertable
Yes
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