Nortel Contivity 4500 Getting Started page 32

Getting Started with the Contivity Extranet Switch 4500
Figure 2-7 shows the T1 CSU/DSU LEDs. Look at the condition of the LEDs,
then examine the corresponding LED table to better understand the indications.
LED 3, G reen
Figure 2-7.
Table 2-8.
LED
LED1, Yellow
LED2, Blue
LED3, Green
LED4, Red
2-16
LE D 4, R ed
LED 2, Blue
LED 1, Yellow
T1 CSU/DSU LEDs
T1 CSU/DSU LED Indicators
Description
Yellow alarm LED is lit when the far-end equipment is in the red
alarm condition.
Blue alarm LED is lit when receiving an upstream failure denoted
by an alarm indication signal (AIS).
Normal operation.
Red alarm is lit when a loss-of-signal (LOS) or out-of-frame
(OOF) condition is detected on the receive signal.