CD (1 or 2) | ALRM (1 or 2) | LPBK (1 or 2) | T1 Condition |
LED Color | LED Color | LED Color | |
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Green | Off | Off | No Alarm |
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Green | Red | Off | Remote Frame Alarm |
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| (RFA) |
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Off | Red | Off | Loss of Signal Alarm |
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| (LOS) |
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Red | Red | Off | Out of Frame Alarm |
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| (OOF) |
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Red | Red | Off | Unframed All Ones Alarm |
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| (AIS) |
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Green | Off | Green | Loopback in Progress |
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| Layer 2 |
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Any | Any | Off | Signaling Channel Up |
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Any | Any | Amber | Signaling Channel Down |
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*If Layer 1 alarms exist, Layer 2 status is not indicated.
If LEDs indicate an alarm condition, refer to the alarm event status screen for details.
Alarm LEDs will still register during loopback.
About T1/PRI Alarm Layer 1 alarm conditions are categorized into one of three alarm levels:
Levels
Alarm | Severity | Result |
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Red Alarm | High | Loss of connection and/or data locally |
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Blue Alarm | High | No data received from Telco; all 1’s received by NAC |
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Yellow Alarm | High | Improper data received at remote end |
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