Juniper EX9214 Hardware Manual page 17

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Figure 3: Rear View of an EX9214 Switch with DC Power Supplies
Host Subsystem
Switching and routing functionality, system management, and system control functions of an EX9214
switch are performed by the host subsystem. The host subsystem consists of a Routing Engine
functioning together with a Switch Fabric.
You must install either two or three host subsystems in the slots 7 through 9—labeled 0, 1, and 2 | 6—in
the front panel of the chassis. A base-configuration EX9214 switch has two host subsystems. A
redundant-configuration EX9214 switch has a third host subsystem. For more information, see "EX9214
Switch Configurations" on page 9.
Line Cards
The EX9214 switch has 12 vertical line card slots. The line cards for EX9214 switches combine a Packet
Forwarding Engine and Ethernet interfaces in a single assembly. Line cards are field-replaceable units
(FRUs) that you can install in the line card slots 1 through 6 (labeled 0 through 5) and 9 through 14