Nortel Networks 1750 manual T1/E1 CSU/DSU WAN interface card LEDs

Chapter 1 Cables and power 33

T1/E1 CSU/DSU WAN interface card LEDs

The following figure shows the LEDs on the T1/E1 CSU/DSU WAN interface card.

Figure 10 LEDs on the T1/E1 CSU/DSU WAN interface card

LED 1, Red LED 2, Blue

LED 4, Green LED 3, Yellow

CS160012A

The following table describes the LEDs on the T1/E1 CSU/DSU WAN interface card.

Table 11 LED indicators on the T1/E1 CSU/DSU WAN interface card

LED	Indicator	Description
LED 1	Red	The red alarm LED lights after a loss-of-signal or
		out-of-frame condition is detected on the receive signal.
LED 2	Blue	The blue alarm LED lights after receiving an upstream
		failure denoted by an alarm indication signal.
LED 3	Yellow	The yellow alarm LED lights when the far-end equipment
		is in the red alarm condition.
LED 4	Green	The green LED lights when the condition is normal
		operation.

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