Alarm Configuration
The Alarm Type list displays the variables available for alarms, the current status of each alarm, and the current threshold setting. To change the status or threshold for an alarm, you must first select it in this list. You can set an alarm threshold for the following variables:
Ring Purges | The number of times the active monitor has purged the |
| ring since the network was created, or since the |
| TRMMIM was last reset. This includes the purge at the |
| end of the active monitor selection process; however, the |
| count is not reset when the active monitor changes. |
Active Monitor | The number of times a duplicate active monitor has been |
Participant | detected on the ring. When any station which considers |
Errors | itself to be the active monitor receives a ring purge or |
| AMP (active monitor present) frame that it did not |
| transmit, it will become a standby monitor. If this process |
| leaves the ring without an active monitor (because both |
| active monitors have switched to standby mode), the |
| monitor contention process will begin. |
Token Errors | The number of times the active monitor either does not |
| see a token circulating on the ring before its TVX (Timer, |
| Valid Transmission) timer expires (e.g., a Lost Frame |
| error has occurred), or sees a recirculating frame or |
| token. Each time a token error is noted, the active |
| monitor purges the ring and issues a new token. |
Claim Token | The number of times a claim token has been released by a |
Errors | station on the ring. A claim token is released when a |
| station detects that the active monitor is missing or |
| malfunctioning, or following a beaconing condition; the |
| issuing of a claim token initiates the monitor contention |
| process, through which a new active monitor will be |
| chosen. |
Lost Frames | The number of times a station’s TRR (Timer, Return to |
| Repeat) timer expires before the frame it is transmitting |
| returns. This timer, which is set to 4.1 milliseconds, |
| ensures that each station returns to the data repeat state |
| after transmitting: retrieves its token, strips it of data, |
| and issues a new token. Lost frame errors will cause the |
| active monitor to initiate the ring purge process and issue |
| a new token; these errors are usually caused by stations |
| entering or leaving the ring while a frame is circulating |
| (since stations entering or leaving briefly throw the ring |
| out of sync). |
Frame Count | The number of frames detected on the ring. |
Setting and Viewing Ring Alarms |
