Juniper Networks EX8208 - Manual (Page 81)

Related Topics Field-Replaceable Units in an EX8208 Switch on page 23 •
• Installing a Fan Tray in an EX8208 Switch on page 154
• Removing a Fan Tray from an EX8208 Switch on page 211
Backplane in an EX8208 Switch
The backplane is a printed circuit board that forms the back of the line card cage. The
Switch Fabric and Routing Engine (SRE) modules, Switch Fabric (SF) module, power
supplies, and line cards plug into the backplane from the front of the chassis. The
backplane contains an EEPROM that stores the serial number and revision level of the
backplane.
The backplane performs the following functions:
• Power distribution—The backplane distributes power to all the switch components
from the power supplies that plug into it.
• Control-signal connectivity—The backplane transports the control signals exchanged
by system components for monitoring, control, and management purposes.
• Transfer of data between line cards and SRE modules—The backplane provides
connectivity for data traffic to and from the line cards and the SRE modules.
WARNING: High levels of electrical energy are distributed across the switch backplane.
Do not touch the backplane connectors, or any component connected to the backplane,
with any metallic object while servicing components installed in the switch.
Related Topics • AC Power Supply in an EX8200 Switch on page 40
55 Copyright © 2010, Juniper Networks, Inc.
Chapter 2: Component Descriptions