Troubleshooting guide

61186003L1-1D 8-3
TAP-100
MX2820 Troubleshooting Guide
INTRODUCTION
This section provides information about the System Controller Unit (SCU) and Multiplexer
(MUX) alarms. The SCU manages alarms for the MX2820 system. When a MUX module issues
an alarm, the module passes this information to the SCU, where the alarm is indicated by
relays and LEDs and added to the alarm log. The SCU also generates shelf-level alarms.
NOTE
Alarms can be acknowledged at the SCU by pressing the ACO but-
ton on the SCU front panel or by shorting the ACO contacts (wire-
wrap posts) on the back panel.
TROUBLE ANALYSIS PROCEDURE
Analyzing and clearing alarms for the MX2820 system requires the following steps:
• Observe the ALM LED status on the SCU front panel.
• Observe of the ALM, DS3/NET STAT, and DS1 STAT LED status on the MUX module front panel.
• Access the System Alarm Log to obtain more details on the alarm condition.
• Determine the cause of the alarm.