T320 Router Major Hardware Components ! 37
Chapter 9: T320 Internet Router Overview
T320 Router Major Hardware Components
Table 11 lists the T320 router major components and characteristics.
Table 11: T320 Router Major Hardware Components
Field-replaceable units (FRUs) are router components that can be replaced at the
customer site. Replacing FRUs requires minimal router downtime. There are three
types of FRUs:
! Hot-removable and hot-insertable—You can remove and replace the
component without powering down the router or interrupting the routing
functions.
! Hot-pluggable—You can remove the component without powering down the
router, but routing functions are interrupted until the replacement is installed.
! Requires router shutdown—You must power down the router before removing
the component.
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 1–2 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
SONET Clock Generator
(SCG)
1–2 Provides Stratum 3 SONET/SDH clocking Yes Hot-pluggable Yes
SIB 3 Provides switch fabric 2 active,
1 standby
Hot-removable,
hot-insertable
Yes
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