LED indicators
A-13
VPN 3000 Concentrator Series User Guide
This table shows all possible combinations for the LEDs on each WAN Port.
End of Appendix
WAN Port LEDs
Alrm
Alarm
CD
Carrier Detect
Sync
Synchronization
LpBk
Loopback
Condition
Off On On Off Normal operation.
Carrier detected,
line in synchronization.
Off Off Off On Line is in loopback mode. This mode
occurs, for example, when you install
the line and the carrier is testing the
signal.
You can also set loopback mode by
pressing the
LpBk switch. LpBk is a
recessed momentary-contact switch
that sets loopback mode in this
sequence:
Port A on
Port B on
Ports A and B on
Ports A and B off.
All four Port LEDs blinking in unison Port configured but not enabled.
T1/E1 Line Error Condition
On Off Off Off “Red” = Complete loss of signal.
Possible causes: out-of-frame errors,
mismatched framing format (e.g., one
side using SF and the other using
ESF), or disconnected line.
On Off Off On “Red” in loopback mode.
On On On Off “Ye ll ow ” = Problem in transmit path;
i.e., the remote connection has
detected a problem on this line.
On On On On “Ye l lo w ” in loopback mode.
On On Off Off “Blue” = Problem in receive path; i.e.,
the line has lost synchronization with
the remote connection.
On On Off On “Blue” in loopback mode.
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