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E120 and E320 11.1.x Hardware Guide
E320 Model
A fully configured E320 router consists of 2 switch route processors (SRPs), 3 switch
fabric modules (SFMs), 12 line modules, and up to 2 I/O adapters (IOAs) per line
module. See Figure 1 on page 5 and Figure 2 on page 5.
An IOA shelf (bracket) can be installed on a slot-by-slot basis to create an upper IOA
bay and lower IOA bay, enabling you to use up to two IOAs in the same slot. This
architecture enables you to combine different IOA types in the same slot and to
support oversubscribed configurations.
NOTE: The routers illustrated in this book might look different than your router due
to configuration variations.
4
Chassis Overview
Switch route processors (SRPs) Perform system management, routing table
calculations maintenance, forwarding table computations, and other control
plane functions
Switch fabric modules (SFMs) Create a distributed shared memory switching
fabric
Line modules (LMs) Are frame processing and forwarding engines for IOAs
Input/output adapter (IOA) Provide the physical connection to the network via
10–Gigabit Ethernet, Ethernet, ATM, and Packet over SONET (PoS) interfaces
Power modules Distribute redundant power feeds through the system to all
components
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Troubleshooting
