Nortel Networks 1750 User Manual
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.
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.
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.
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.
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.
is in the red alarm condition.
LED 4
Green
The green LED lights when the condition is normal
operation.
operation.
CS160012A
LED 4, Green
LED 3, Yellow
LED 1, Red
LED 2, Blue