Juniper JUNOS OS 10.3 - SOFTWARE, Manual

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The EX8208 chassis backplane distributes the data, control, and management signals
to various system components along with distributing power throughout the system.
See Chassis Physical Specifications of an EX8208 Switch.
Routing Engines and Switch Fabric
Switching functionality, system management, and system control functions of an EX8208
switch are performed by a Switch Fabric and Routing Engine (SRE) module. See Switch
Fabric and Routing Engine (SRE) Module in an EX8208 Switch. An SRE module contains
a Routing Engine and switch fabric. The SRE modules are installed in the front of the
chassis in the slots labeled SRE0 and SRE1. See Slot Numbering for an EX8208 Switch.
A base configuration EX8208 switch has one SRE module. A redundant configuration
EX8208 switch has a second SRE module. See EX8208 Switch Configurations.
The Switch Fabric (SF) module, working with the SRE module, provides the necessary
switching functionality to a base configuration EX8208 switch. The SF module is installed
in the front of the chassis in the slot labeled SF. In a redundant configuration the SF
module provides a redundant switch fabric. The additional switch fabric provides full 2+1
switch fabric redundancy to the switch. See Switch Fabric (SF) Module in an EX8208
Switch.
Line Cards
The EX8208 switch features eight horizontal line card slots and supports the line rate
for each line card. The line cards in EX8200 switches combine a Packet Forwarding
Engine and Ethernet interfaces on a single assembly. Line cards are field-replaceable
units (FRUs) that can be installed in the line card slots labeled 0 through 7 on the front
of the switch chassis. See Slot Numbering for an EX8208 Switch. All line cards are
hot-removable and hot-insertable.
The following line cards are available for EX8208 switches:
•
8-port 10-Gigabit Ethernet SFP+ line card: This line card has eight 10-gigabit SFP+
ports on its faceplate in which you can install SFP+ transceivers. See 8-port SFP+ Line
Card in an EX8200 Switch.
• 40-port 10-Gigabit Ethernet SFP+ line card: This line card has 40 10-gigabit SFP+ ports
on its faceplate in which you can install either SFP+ or SFP transceivers. See 40-port
SFP+ Line Card in an EX8200 Switch.
• 48-port 100/1000 SFP line card: This line card has 48 1-gigabit SFP ports on its
faceplate in which you can install SFP transceivers. See 48-port SFP Line Card in an
EX8200 Switch.
•
48-port 10/100/1000 RJ-45 line card: This line card had 48 10/100/1000 Gigabit
Ethernet ports with RJ-45 connectors on its faceplate. See 48-port RJ-45 Line Card in
an EX8200 Switch.
Cooling System
The cooling system in an EX8208 switch consists of a hot-removable and hot-insertable
fan tray. The fan tray contains 12 fans. The fan tray installs vertically on the left front of
35 Copyright © 2010, Juniper Networks, Inc.
Chapter 2: Supported Hardware