Cisco Headend Digital Broadband Delivery System 사용자 가이드
Appendix B
Bootloader LED Error Codes
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4025012 Rev B
Bootloader Error Codes
Low-level bootloader error codes on the single-LED Tuning Adapter display if there
is an error condition detected by the bootloader when the Tuning Adapter boots, or
when it loads or installs software.
The Tuning Adapter displays the error code between a series of 4 illuminations.
The Tuning Adapter displays the error code between a series of 4 illuminations.
Before the Tuning Adapter displays the error code, it will blink 4 times, then display
the error code, then blink 4 times, etc.
4 blinks, [error code] 4 blinks, [error code] 4 blinks, etc.
Note: The error code can display as many as 10 times.
Reading Error Codes on the Tuning Adapter
Error codes are displayed by the Tuning Adapter LED as a series of bright and dim
illuminations, which correspond to the ones and zeros of a binary code. The bright
illuminations represent 1 (or 'on') digits, and the dim illuminations represent 0 (or
'off') digits. The binary code is displayed by the Tuning Adapter from left (most-
significant bit) to right (least-significant bit).
The LED is located on the face of the Tuning Adapter.
Example: The binary code 0100 0001, representing a hexadecimal value of 0x41, is
read as one dim illumination followed by one bright illumination, followed by five
dim illuminations, and finally one bright illumination.
Important: You might not be able to distinguish a 'space' between consecutive dim
Important: You might not be able to distinguish a 'space' between consecutive dim
or bright illuminations. However, the relative time for each illumination is the same.
Therefore, two illuminations take twice as long to display as a single illumination.