Understanding The Signal Lights - Eicon Networks ISDN NT1 Installation Manual

Understanding the Signal Lights

The three lights (LEDs) on the front panel of the NT1 provide
information about the status of the NT1 and the ISDN line.
Table 2 explains the significance of each light.
Light
L-BK
LINE
PWR
L-BK
Figure 3. Signal Lights
State
Off
On
On
Flashes 8 times
Flashes once per second
Off
On
Off
Table 2. Explanation of the Signals
Eicon Network Termination (NT1) Installation Guide
LINE PWR
Explanation
Normal.
Your ISDN service provider is
conducting a loopback test.
The S/T and U interfaces are not active.
The NT1 is trying to activate the
U-interface link.
The S/T interface is not fully active.
The S/T and U interfaces are fully active.
The power supply is connected.
The NT1 is not receiving power.
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