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LED
Location
LED (ACT)
ISDN B1
channel link
Rear panel
status LED (B1)
ISDN B2
channel link
Rear panel
status LED (B2)
Serial port link
Rear panel
status LED (LINK)
Serial port data
transmission
Rear panel
status LED (ACT)
Status
Description
Flashing green
The ISDN link is being activated.
(8 Hz)
The ISDN link is not activated or no ISDN link is
Off
present.
Flashing green
Data is being received or transmitted on the B1
(8 Hz)
channel.
No data is being received or transmitted on the B1
Off
channel.
Flashing green
Data is being received or transmitted on the B2
(8 Hz)
channel.
No data is being received or transmitted on the B2
Off
channel.
Off
No link is present.
Steady green
A link is present.
Off
No data is being received or transmitted.
Flashing yellow
Data is being received or transmitted.
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