Specifications

B-9
VPN 3000 Series Concentrator Reference Volume II; Administration and Monitoring
78-13274-01
Appendix B Troubleshooting and System Errors
LED Indicators
This table shows all possible combinations for the LEDs on each WAN port.
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.
Alrm
Alarm
CD
Carrier Detect
Sync
Synchronization
LpBk
Loopback T1/E1 Line Error Condition
On Off Off Off Red—Complete loss of signal. Possible
causes: out-of-frame errors,
mismatched framing format (for
example, one side using SF and the
other using ESF), or disconnected line.
On Off Off On Red in loopback mode.
On On On Off Yellow—Problem in transmit path; that
is, the remote connection has detected a
problem on this line.
On On On On Yellow in loopback mode.
On On Off Off Blue—Problem in receive path; that is,
the line has lost synchronization with
the remote connection.
On On Off On Blue in loopback mode.