Juniper EX9253 Hardware Manual page 26

• 10MHZ (one input and one output)—The 10-MHz timing connectors connect the switch to external
clock signal sources. The clocking ports provide the synchronized output clocks from any one of the
reference clock inputs based on the clock' s priority.
• PPS (one input and one output)—1-pulse-per-second (PPS) connectors connect the switch to external
clock signal sources. The clocking ports provide the synchronized output clocks from any one of the
reference clock inputs based on the clock' s priority.
• USB—The USB port provides a removable media interface. Junos OS supports USB version 1.0 and
later.
Table 6 on page 17 describes the functions of the LEDs on the REs.
Table 6: LEDs on the Routing Engines in an EX9253 Switch
LED
ONLINE
OK/FAIL
Color
Green
Red
–
Green
Red
–
State
On steadily
Blinking
On steadily
Blinking
Off
On steadily
Blinking
Off
Description
Both Junos OS and Linux
are successfully loaded on
the switch.
The switch is starting
Junos OS.
The switch has loaded
Linux.
The switch is starting
Linux.
The switch is offline.
The switch is functioning
normally.
The switch has failed.
The switch is not
powered on.
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