Sfm Module; Fabric Slices - Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - E120 AND E320 HARDWARE GUIDE REV 9-29-2010 Hardware Manual

SFM Module

Copyright © 2010, Juniper Networks, Inc.
Failure to do this can result in file corruption in one or both cards. See
"Replacing an NVS Card" on page 70 for more information.
The switch fabric modules (SFMs) work with the SRP module to create a shared memory
fabric for the router. Each SFM module (Figure 6 on page 9) has its own memory and
power converter. Like the SRP module, the SFM module contains a fabric system processor
board (slice). See "Fabric Slices" on page 9.
NOTE: You must use a SRP module that corresponds with the fabric type
(SFM module) that is installed. For example, you can only use a SRP–100
module with a SFM-100 module. You cannot use a SRP–100 module with a
SFM-320 module.
Figure 6: SFM Module

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:
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
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.
Chapter 1: E120 and E320 Overview
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