Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - ERX MODULE GUIDE REV 27-9-2010 Manual page 112

ERX 11.3.x Module Guide
112
Figure 1: SRP Module LEDs
NOTE: The primary SRP module illuminates the REDUNDANT LED only
when the SRP module detects that there is a secondary or standby SRP
module online. The standby SRP module monitors an activity signal from
the primary SRP module to determine its state; it does not shadow the
operations of the primary SRP module. If the standby SRP module detects
that the primary SRP module is not active, it reboots the system and takes
control. (ERX7xx/14xx models only)
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