![](/images/new-backgrounds/1266205/266205189x1.webp)
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| Operating the AN/DC and |
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| LED Label |
| Color | Meaning |
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| AUI Part |
| Amber | Lights to indicate that the AUI port has been |
| (Partition) |
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| partitioned from the repeater due to a disruption in |
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| transmission. Autopartitioning occurs after an |
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| excessive number of consecutive collisions or an |
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| excessively long |
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| DCD1 (Data Carrier | Green | Lights to indicate that the first synchronous port | |
| Detect 1) |
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| (COM1) is active. |
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| DCD2 (Data Carrier | Green | Lights to indicate that the second synchronous port | |
| Detect 2) |
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| (COM2) is active. |
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| <LAN> |
| Green | Lights after each data transmission to indicate data |
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| present in the repeater. The signal is longer than the |
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| duration of data, allowing the eye to perceive the |
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| occurrence of very short transmissions. The LED may |
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| appear to flicker during numerous transmissions. |
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| Col |
| Amber | Lights to indicate a collision in the AUI repeater. |
| (Collision) |
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Back-Panel LEDs
Figure 4-3 illustrates the back-panel LEDs for the ISDN and Second Ethernet options. These LEDs are visible after installing either an ISDN BR Interface or Second Ethernet Interface upgrade module.
1.5A
RTN
COM 3/Expansion | COM 2 |
| COM 1 | |
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TX
RX
1 LED | 3 LEDs |
AN0059B