Circuit Pack LEDs
Issue 1 May 2002
6-11555-233-143
DS1 Facility LEDs
Below the three standard LEDs on the DS1C circuit pack are four green LEDs that
indicate whether a receive signal is present for each of the four DS1 facilities.
Figure 6-2 shows which facility (A, B, C, or D) corresponds to each LED. If a
green LED is off, there is a Loss of Signal condition on the DS1 facility associated
with that LED. The presence of a signal does not guarantee that the signal is
using the correct framing format or line coding; an Alarm Indication Signal
indicating that the opposite end of the DS1C complex is out of service may be
present.
Figure Notes:
1. Alarm LED (Red)
2. Test LED (Green)
3. Busy LED (Yellow)
4. STATUS LEDs
5. SPAN LEDs
Figure 6-2. TN574 DS1 Converter Circuit Pack LEDs
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