Based on generation reasons, faults can be classified into the equipment fault and the extremely heavy traffic fault.

Equipment Fault:

An equipment fault is a severe fault which causes the loss of most or all of the functions of the equipment.

Breakdown of Cabinet or Frame

Any of the following situations might result in the breakdown of a frame, cabinet, or even the entire system.

·         The power-off of the main control cabinet (cabinet 0) or master service frame (frame 0 of the main control cabinet) leads to the breakdown of the entire system.

·         The simultaneous breakdown of the active and standby HSYS boards of the master service frame leads to the breakdown of the entire system.

·         The simultaneous breakdown of the active and standby HSYS boards of the slave service frame leads to the breakdown of the service frame.

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In the default configuration, the main control cabinet refers to cabinet 0, the master service frame refers to frame 0 of the main control cabinet, and the slave service frame refers to all the service frames excluding the master service frame.

BAM Breakdown

BAM breakdown is a severe fault resulting in the loss of all BAM functions. In actual applications, any of the following conditions is regarded as a kind of BAM breakdown:

·         Power failure of the BAM.

·         Unable to start the BAM.

·         Automatic and frequent resetting of the BAM.

·         The CPU utilization of the BAM is near 100% for a long time.

·         The Windows operating system of the BAM breaks down during the operation or it is unable to boot when the BAM starts.

·         Abnormal running of the "BAM Manager". For example, unable to start the BAM Manager, unable to start all the service processes (their states are "Stopped"), or all the service processes enter the "Exception" state after being started repeatedly.

Restart of Equipment

Restart the system when:

·         You need to load a batch of data to the equipment.

·         You need to power on the equipment again after powering it off for other reasons.

·         You find that the data in the host and the BAM are not consistent, and cannot recover the data through the commands.

Unexpected Power Failure in Board

When a board is working normally, it may be powered off if you press the red locker on the ejector lever inattentively. The board is powered off or faulty when:

·         The blue hot-swap indicator on the front panel of the board is on or all the indicators on the front panel of the board are off.

·         The indicator displayed is red when you open the system navigator window on the left of the maintenance console and select System Setting > Board Position Management.

For details, refer toParts Replacement Guide.

When a board is powered off unexpectedly, pull it out and insert it again to power it on.

 

Extremely heavy traffic faults:

Extremely heavy traffic may cause congestion in links, SLPU, SBPU/SBPE, or HSYS, which may result in mass congestion in all links or boards.

The following situations lead to extremely heavy traffic faults:

• The CPU utilization rises sharply, often to above 50%.
• Corresponding loading alarms of links are generated. Sometimes, a large number of TransFer-Forbidden signal (TFP) and TransFer-Allowed signal (TFA) messages frequently appear on links, causing the frequent switchover of the links.

 

 

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