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Normal LED Meanings 125
WAN LEDs The following figure describes the WAN LEDs when an ISDN or a
CSU/DSU connection is being used.
LAN LEDs The following figure describes the LAN LEDs.
Lights green when the path is up.
(D channel). Lights green when the ISDN line is activated.
(D channel). Lights amber to indicate a loss of signal, such as a
disconnected cable.
Lights amber when an error in the frames is
detected.
Lights green when an end-to-end connection
exists or is in progress.
Connect
Fault
(CSU/DSU)
B1
Link
Line
Act
Line
Error
WAN
B2
Connect
Fault
(CSU/DSU)
B1
Link
B2
Line
Act
Line
Error
ISDN only
The CSU/DSU uses only the B1 LEDs.
Normal operation
Lights green when 100BASE-TX Ethernet is in use.
Lights green when the path is up.
Flashes green when a packet is detected on the LAN.
Lights amber when a an error is detected or the self-test
has failed.
100mb
Link
Fault
Active
L1
L2
L2
LAN
100mb
Link
Fault
Active
L1 L2
Normal operation