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Appendix A
Troubleshooting
Table A-3
LED
Loopback
Alarm
Carrier Detect Green
In a redundant configuration, when the relays of the VWIC open, the Carrier Detect LED
Note
on the T1 ports will remain lit and the Alarm LED will also come on. Therefore, the
inactive router will show both the Carrier Detect light and the Alarm light, while the active
router will show only the Carrier Detect light.
78-13982-02
VWIC LEDs
Color
Description
Amber
A loopback or line state is detected or is manually set by the user.
Off
Normal operation.
Amber
A local or remote alarm state.
Off
Normal operation.
A carrier has been detected and the internal DSU/CSU in the WAN
interface card is communicating with another DSU/CSU. This LED is on
during normal operation.
Off
No carrier has been detected.
Cisco MWR 1900 Mobile Wireless Edge Router Hardware Installation Guide
Reading the LEDs
A-5
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Table of Contents
Troubleshooting
