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Getting Started with the Contivity Extranet Switch 2500
2-14
Figure 2-6. T1 CSU/DSU LEDs
Table 2-7. T1 CSU/DSU LED Indicators
LED Description
LED1, Yellow Yellow alarm LED is lit when the far-end
equipment is in the red alarm condition.
LED2, Blue Blue alarm LED is lit when receiving an
upstream failure denoted by an alarm
indication signal (AIS).
LED3, Green Normal operation.
LED4, Red Red alarm is lit when a loss-of-signal (LOS) or
out-of-frame (OOF) condition is detected on the
receive signal.
LED 4, Red
LED 3, Green
LED 1, Yellow
LED 2, Blue