TANDBERG MSE 8321 - Manual (Page 6)

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LED behavior
Table 1 describes the behavior of the LEDs.
Table 1: ISDN gateway LED behavior
LED Color Indicates
Compact Flash
Activity Flashing
green One of:

the ISDN gateway is booting

a configuration change has been made

the configuration is being transferred by FTP
Console Link Green A PC is connected to the console port
Status Green The ISDN gateway is operating normally
Alarm Red The ISDN gateway is booting or has developed a
fault, for example:

temperature is outside normal limits

battery failure of the internal clock
Refer to the web interface for more information
about the problem (go to
Status > Health
)
ISDN Port Status, for each ISDN port:
L1 Off There is no connection on this port, or the ISDN
gateway is not receiving framing (also known as
Red Alarm)
Flashing
green The ISDN gateway is receiving framing, but the far
end is not receiving framing (also known as Yellow
Alarm)
Green The port is connected to the far end
L2 Green Layer 2 connectivity has been achieved with the
ISDN network from this port. This means that
D-channel signaling has been established with the
network
Act Green There is at least one active call using this port.
Data is currently being received on this port