Appendix F: Using the LineStatus Utility
Alarm LEDs
| The following alarm LEDs indicate connection problems that | |
| result from line failures: | |
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|
LED |
| Meaning |
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|
LOS |
| Loss of Signal. Typically appears when no electrical signal is |
|
| detected. (check if line is plugged on the adapter and on the |
|
| network interface). |
|
|
|
LOF |
| Loss of Frame (also known as Red Alarm) appears when many |
|
| frames are lost because of framing errors. The terminal is unable |
|
| to synchronize on the DS1 signal. |
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|
|
AIS |
| Alarm Indication Signal (also known as Blue Alarm). |
|
| Transmitted instead of the normal signal to maintain |
|
| transmission continuity. Also indicates to the receiving |
|
| equipment that a transmission interruption occurred either at the |
|
| equipment originating the AIS signal, or upstream of the |
|
| originating equipment. |
|
|
|
RAI |
| Remote Alarm Indication (also known as Yellow Alarm). |
|
| Transmitted in the outgoing direction when a terminal |
|
| determines that it has lost the incoming signal. |
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iSPAN PRI PCI ISDN Users Guide | 111 |