DS1 Converter Circuit Pack LEDs��
Eleven LEDs provide an indication of the state of the TN1654 DS1 Converter Circuit Pack LEDs and the T1/E1 facilities. The top group has the standard red, green and yellow LEDs. The red LED indicates an alarm condition and the green LED indicates testing in progress. The 4 SPAN LEDs indicate the status of the T1/E1 facilities. The four STATUS LEDs are currently unused and remain off.
TN1654 DS1 Converter Circuit Pack LEDs
Figure notes
- Alarm LED (Red)
- Test LED (Green)
- Busy LED (Yellow)
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- STATUS LEDs
- SPAN LEDs
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The yellow LED is used to indicate the state of the fiber interface, the fiber channel, the control channel, and the communications link to the SPE in the following manner and order of priority. See DS1 Converter Yellow LED Flashing States.
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DS1 Converter Yellow LED Flashing States �
| LED on |
LED off |
Condition |
| 0.1 second |
0.1 second |
Fiber out-of-frame or fiber loss of signal |
| 0.5 second |
0.5 second |
In frame, fiber channel down. The fiber channel communicating between the DS1 Converter and the other fiber endpoint (EI or SNI) is down. |
| 1 second |
1 second |
In frame, control channel down. The control channel between the 2 DS1 Converters in the DS1 Converter complex is down. |
| 2 seconds |
0.2 second |
No response from the media server. The media server is not acknowledging messages from the DS1 Converter or the communications link to the media server is down. |
| solid on |
� |
DS1 Converter active. This is the normal state for an active DS1 Converter. |
| � |
solid off |
DS1 Converter standby. This is the normal state for a standby DS1 Converter in critical reliability configurations (duplicated PNC). |
SPAN LEDs��
The 4 SPAN LEDs indicate the status of the 4 T1/E1 facilities. A SPAN LED is in one of the following states:
- Solid on yellow: Facility is operational and alarm free.
- Blinking yellow for 2 seconds, off 0.1 seconds: Facility is operational and alarm free AND is carrying the control channel (facility A or B only).
- Solid on red: Facility is alarmed.
- Solid off: Facility is not administered or has been busied out.
