Juniper M Series - T640 Router Major Hardware Components; Table 13: T640 Router Major Hardware Components

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 router, see the T640 Core Router PIC Guide.
The Switch Interface Boards (SIBs) provide the switching function to the destination
FPC. The SIBs create the switch fabric for the router, providing up to a total of 640 million
Mpps of forwarding. Five SIBs are installed in the router.
The host subsystem provides the routing and system management functions of the
router. The host subsystem consists of the Routing Engine and the Control Board. The
Routing Engine maintains the routing tables used by the router and controls the routing
protocols that run on the router.
Each Control Board works with an adjacent Routing Engine to provide control and
monitoring functions for the router. These include determining Routing Engine mastership;
controlling power, reset, and SONET clocking for the other router components; monitoring
and controlling fan speed; and monitoring system status using I²C 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.
Related
Documentation
T640 Router Major Hardware Components on page 33•
T640 Router Major Hardware Components
Table 13 on page 33 lists the major T640 router components and characteristics.
Table 13: T640 Router Major Hardware Components
Offline
Button
Field-
ReplaceableRedundantFunctionQuantityComponent
—Hot-pluggable—Provides ports for external management
and alarm relay devices
1Connector Interface
Panel (CIP)
YesHot-pluggableYesMonitors and controls router components1–2Control Board
—hot-removable,
hot insertable
YesCools router components2 front fan
trays,
1 rear fan
tray
Cooling system
—Hot-removable.
hot-insertable
—Displays status and provides an interface
for controlling router functions
1Craft interface
YesHot-removable,
hot-insertable
—Connect PICs to other router components,
contains Packet Forwarding Engines
1–8FPC
YesHot-removable,
hot-insertable
—Provides an interface to various network
media
1–4 per
FPC
PIC
33Copyright © 2012, Juniper Networks, Inc.
Chapter 2: T Series Core Routers