Powering Up, Initializing, and Configuring
7750 SR-a4 and SR-a8 Installation Guide 127
Step 1. To initiate the boot process, plug the male end of the power cord into a 3-terminal,
single-phase power source that provides power within the acceptable range, as
described in Site Preparation on page 47.
Step 2. Check that the LED on each PSU is green. A green LED indicates that the AC
standby and main power supply outputs are operating within specification. If the
LED is off, there is no power input. Refer to 7750 SR-a AC PSU LED and
Connectors on page 138 for more information.
To power-up a DC powered system:
Step 1. Turn on the power at the remote power sources to initiate the boot process.
Step 2. Check that the LED on each PSU is green. A green LED indicates that the DC
standby and main power supply outputs are operating within specification. If the
LED is off, there is no power input. Refer to 7750 SR-a –48 VDC PSU LED and
Connectors on page 139 for more information.
Component LED Verification
To verify that the components power up correctly:
Step 1. Verify that the system is initializing.
The system searches the CF card on the CPM for the boot.ldr file (also known
as the bootstrap or boot loader file).
The Status LED on the CPM-a slowly blinks green during initialization.
After initialization (approximately 30 s), the Status LED on the active CPM turns
solid green to indicate that the CPM boot/load process is complete and that the
CPM-a is operational as the primary CPM.
The Status LED on the inactive secondary CPM-a rapidly blinks green to indicate
that the CPM-a boot/load process is complete and that the CPM-a is operational as
the secondary CPM-a.
If the LEDs do not operate as described above, or if they blink and turn off, refer to
Troubleshooting Initial Startup on page 134.
Step 2. Verify the operational status of the router components by checking all the LEDs on
the CPM-a, IOM-a, fan tray and MDA-a components.
Refer to Appendix A: Connectors and LEDs on page 137 and Appendix B: MDA-
a and MDA-aXP Card Descriptions on page 147 for more information.
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