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Chapter 1 Cables and power 33
Nortel VPN Router Installation — VPN Router 1750
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
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.
CS160012A
LED 4, Green LED 3, Yellow
LED 1, Red LED 2, Blue