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Table 4 defines the system states indicated by the front panel LEDs. When power is applied to the unit, one of the LEDs listed in Table 4 will always be on.
Table 4. Line and Desktop Unit Front Panel LED Indications
LED | Mode |
| Description |
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HDSL SYNC LED | Steady green |
| HDSL loop is ready to transmit and receive data across all spans. |
| Slow blinking |
| HDSL loop acquisition is in progress for local span. |
| Off |
| HDSL loop is not configured. |
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HDSL ALM LED | Steady red |
| Loss of sync word (LOSW); or the margin is below the set margin |
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| alarm threshold; or Errored Seconds (ES) count is above |
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| threshold on any span. |
| Pulsing red |
| Pulses for every ES on any span. |
| Off |
| Normal transmit or receive data is in progress. |
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I/F ALM LED | Steady red |
| Loss of Signal (LOS) alarm due to loss of G.703 signal or Loss of |
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| Clock (LOC) alarm due to loss of external clock (when using EXT |
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| timing). |
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LPBK LEDs (a) | LOC | REM |
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| Steady yellow | Off | Local HDSL analog loopback is active. |
| Off | Off | No loopbacks are active. |
| Blinking yellow | Off | Local interface loopback is active. |
| Off | Steady yellow | Remote loopback is active. |
| Blinking yellow | Blinking yellow | A loopback away from the local equipment is active. |
(a)The LOC and REM LPBK LEDs are read in unison.
6 | August 9, 2002 |