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E120 and E320 11.1.x Hardware Guide
Fabric Slices
The router's switch fabric is distributed across two SRP modules and three SFM
modules. Each module has a fabric slice on it. For the router to operate, at least four
of the five slices must be operational.
When all five modules are installed, the fabric slice of the standby SRP acts as a
redundant module. For example, the router can operate with:
NOTE: You cannot use SFM modules of different capacities in the same configuration.
For example, you cannot install a SFM-100 module and a SFM-320 module in the
same router.
SRP IOA
The SRP I/O adapter (IOA) is a single input/output adapter that interfaces with the
SRP modules through the system's midplane. See Figure 2 on page 5 and Figure 4
on page 7 for its location.
Module Details
The SRP IOA provides standard management interfaces, including:
You can hot-swap SRP IOAs. Hot-swapping enables you to add or remove SRP IOAs
without powering down the system. When you complete hot-swapping an SRP IOA,
its MAC address in the subnet is automatically refreshed without rebooting the SRP
or the chassis. Also, you can re-insert an SRP IOA that you had taken out previously
to the same network without refreshing the MAC address of the SRP IOA.
10
E120 and E320 Modules
Two SRP modules (the second of which is redundant) and three SFM modules
One SRP module (non-redundant) and three SFM modules
Two SRP modules and two SFM modules
10/100Base-T The port enables access to the router for Ethernet management
functions through Telnet, Secure Shell Server (SSH), command-line interface
(CLI), or Simple Network Management Protocol (SNMP), for example.
RS-232 One port (console) provides a serial connection for monitoring the
system's hardware configuration through a PC (running terminal emulation
software) or ASCII terminal and enables direct CLI access. The second port
(auxiliary) provides access to debug ports on specific processors (SRP module,
line module). Juniper Networks customer support engineers use the auxiliary
port. We recommend that users do not use the auxiliary port.
External timing inputs The BNC connectors provide a method of ensuring that
the clock timing used by the router remains synchronized with the network's
system clock.
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Troubleshooting
