Module Details - Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual

E120 and E320 11.1.x Hardware Guide
which line modules are physically present in the chassis and monitors and controls
vital functions on the line modules.
Each SRP module (Figure 5 on page 8) is a PowerPC-based system with its own
memory, nonvolatile storage (NVS), and power converter. The SRP module works
with the SFM modules and contains a switch fabric slice common to both modules.
See "Fabric Slices" on page 10 for more information.
NOTE: Because of different physical dimensions and switch fabric capabilities, SRP
modules are not interchangeable between all routers. For example, the SRP–100
used in the E320 router cannot be used in other E Series routers, and vice versa. See
the E120 and E320 Module Guide for SRP module compatibility.
Figure 5: Representative SRP Module

Module Details

An SRP module must be present for the router to boot. The routers support up to
two redundant SRP modules operating in an active/standby configuration. The
redundant SRP module takes control when a failover occurs. See "Redundancy
Features" on page 14 and the E120 and E320 Module Guide for more SRP module
information.
CAUTION: Do not remove the SRP module while the system is running, unless you
have properly issued the halt command. See JUNOSe System Basics Configuration
Guide, Chapter 6, Managing Modules for information about the halt commands.
8
E120 and E320 Modules