A-10 61200290L1-1GAppendix A, Acceptance Test Procedure MX2800 M13 Multiplexer User Manual13. Confirm that both power supplies and power feeds are functioning as normal. Front panel LEDsidentify problems with the power supplies, but the inputs can be tested only via VOM.Controller Card RedundancyThe MX2800 can be equipped with either one or two Controller cards. The Controller contains all of theMX2800's critical circuitry, including the DS3 interface, DS1 interfaces, management and communica-tions hardware/firmware, etc. If the MX2800 is equipped with only one Controller, there is no protectionagainst failure. If a failure does occur to the Controller, an alarm is initiated; and the front panel LEDsreflect the condition. The ACT LED is either solid or flashing red.If the MX2800 is equipped with two Controller modules, all traffic is protected and can be switched overto the Standby Controller in the event of a card failure. The following procedures demonstrate thefunctionality of a Controller switchover:1. Using the BERT setup that should still be in place from previous testing, ensure that the system is stillpassing traffic error free.2. Log into the MX2800 (if necessary) via the craft port to get to the Main Menu screen. From there,select Configuration, followed by Network Interface and Active Controller.3. This procedure shows which Controller (A or B) is currently Active. If the A Controller is Active,select Controller B as the Active Controller. Doing so forces a switch to the B Controller, which isacting as a hot standby. If the B Controller is the Active Controller, force a switch to the A Controller.4. Traffic is interrupted momentarily during the switch but quickly returns to error-free performanceagain on the new Controller.5. Although either Controller can be the Active Controller, for consistency, the A Controller should beleft as the Active one.NOTERepeat the log-in sequence in Step 2 after each protection switch.7. RESTORING DEFAULT SETTINGSAfter all Acceptance Tests have been successfully completed, the MX2800 can be restored to its defaultsettings by following the procedures below:1. Log into the MX2800, if necessary, via the craft port. From the Main Menu, select Configuration,followed by Utilities and Load Default Settings.2. Once the settings have been retrieved and loaded into the system, Command Accepted appears atthe bottom of the screen. The Standby Controller always maintains an exact copy of the ActiveController’s attributes. Confirm that all settings are as expected via the craft port.3. Normalize all loopbacks as appropriate, and restore all cabling and DSX panels to normal.Office and Autonomous alarms may be generated as a result of performing Step 3, above. DS3 alarms canbe cleared by looping the DS3 back toward the MX2800 and setting the MX2800 Timing to Local via the
