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| Model | Page: 2 of 15 | ||
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| LED | Status | Description |
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| MCU FLT | On | The VNA has lost communication with the MCU. The MCU and the VNA | |
| (red) |
| continuously update handshaking information. If the MCU is not updating that | |
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| information as the VNA expects, then the VNA turns on this LED. This LED | |
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| may be On during maintenance of the MCU. |
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| Off | The “On” condition is not occurring. |
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| RAI/RYEL | On | The VNA is receiving the T1 Yellow Alarm (Remote Alarm Indication), and is | |
| (yellow) |
| not transmitting the T1 Yellow Alarm. |
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| Flashing | The VNA both is receiving and is transmitting the T1 Yellow Alarm. The | |
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| 90% On | frequency of flashing is approximately one Hertz. |
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| Flashing | The VNA is transmitting the T1 Yellow Alarm, and is not receiving the T1 | |
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| 50% On | Yellow Alarm. The frequency of flashing is approximately one Hertz. | |
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| Flashing | The T1 transceiver on the VNA is not initialized. The frequency of flashing is | |
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| 10% On | approximately one Hertz. |
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| Off | All of the above four conditions are not occurring. |
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| AIS/RBL | On | The VNA is receiving the T1 Blue Alarm (Alarm Indication Signal), and is not | |
| (blue) |
| transmitting the T1 Blue Alarm. |
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| Flashing | The VNA both is receiving and is transmitting the T1 Blue Alarm. The | |
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| 90% On | frequency of flashing is approximately one Hertz. |
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| Flashing | The VNA is transmitting the T1 Blue Alarm, and is not receiving the T1 Blue | |
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| 50% On | Alarm. The frequency of flashing is approximately one Hertz. | |
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| Flashing | The T1 transceiver on the VNA is not initialized. The frequency of flashing is | |
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| 10% On | approximately one Hertz. |
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| Off | All of the above four conditions are not occurring. |
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| LOF/RLOS | On | The VNA is not synchronized with the received T1 signal (Loss of Frame or | |
| (red) |
| Receive Loss of Synchronization), and does not detect a short on its T1 | |
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| transmit line. |
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| Flashing | The VNA both is not synchronized with the received T1 signal and detects a | |
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| 90% On | short on its T1 transmit line. The frequency of flashing is approximately one | |
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| Hertz. |
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| Flashing | The VNA detects a short on its T1 transmit line, and is synchronized with the | |
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| 50% On | received T1 signal. The frequency of flashing is approximately one Hertz. | |
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| Flashing | The T1 transceiver on the VNA is not initialized. The frequency of flashing is | |
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| 10% On | approximately one Hertz. |
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| Off | All of the above four conditions are not occurring. |
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\\s_eng\gtcproddocs\standard ioms - current release\42004 instr.
