Enterasys Networks MicroMMAC-T manual Burst Errors, Abort Sequences, Internal Errors

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Token Ring Statistics

The first station detecting the data corruption sets the E bit to 1 in the ending delimiter of the frame and logs the error. This prevents other stations from logging the error and isolates the portion of the line which is causing the data corruption.

Burst Errors

Displays the total number of burst errors detected on the ring. These errors occur when a station does not clock an incoming data signal correctly.

Token ring protocol uses Differential Manchester Encoding for its signalling format. Using this code, each bit time is halved, with a correct signal having a transition at the center of the bit time (i.e., switching between 0 and 1, or vice versa, in the middle of the bit time). Burst errors occur when a station receives five half-bits of Manchester encoded data without a change in phase from 0 to 1 (thus indicating no change in data value).

These usually occur when there was a brief disruption on the cable, or a brief electrical surge or electronic noise on the network.

A.C. Errors

The count of AC Errors detected on the ring. These indicate that the reporting station’s Nearest Active Upstream Neighbor (NAUN) is faulty, because it is unable to report its address during neighbor notification.

If a station receives more than one Active Monitor Present (AMP) or Standby Monitor Present (SMP) frame with the Address Recognized Indicator (ARI) and Frame Copied Indicator (FCI) bits set to 0 without receiving an intervening AMP frame with these bits set to 1, it recognizes that its NAUN failed to set the ARI/FCI bits.

The detecting station indicates the error to the active monitor, then ends the ring poll process by not transmitting an SMP frame.

Abort Sequences

The count of abort delimiters transmitted on the ring. These are recorded when a station detects a corrupted token while transmitting, then sends an abort delimiter to halt frame transmission before the expected end-frame sequence.This error will cause the active monitor to restore the ring through the ring purge process. This error is somewhat uncommon, and often indicates a failing adapter. A common cause of abort sequences is overheating by the adapter in an overloaded system. Note that the adapter may also issue an Internal Error simultaneously, which will cause the adapter to remove itself from the ring.

Internal Errors

Displays the total number of internal errors detected on the ring. These are recorded when a station recognizes a recoverable internal error in its own adapter. You can use this to detect a station in marginal operating condition, possibly with an inoperable chipset, timers, or counters. A large number of internal errors can indicate that one or more stations on the monitored ring are in marginal operating condition.

Network Level Statistics

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Contents MicroMMAC-T Users Guide Page Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Token Ring Statistics ContentsChapter Token Ring Alarms Chapter Station List and Station MapIndex Contents Viii Introduction Introduction Using This GuideUsing the Mouse Related ManualsSoftware Conventions Left Mouse Button Right Mouse Button Common MicroMMAC-T Window Fields Using Window ButtonsMAC Address Device NameIP Address LocationUsing On-line Help Getting HelpGetting Help from Enterasys Global Call Center Introduction MicroMMAC-T Chassis View Viewing Chassis Information Front Panel Information Menu Structure TimeDate Device Menu MicroMMAC-T Chassis View Menu StructurePort Status Menu Utilities Menu Network MenuHelp Menu Module MenusPort Menus Port Status Displays Ring Port MenusSelecting a Port Status View Errors LoadStatus Port Assignment Ring Port StatusPort Status Color Codes Chassis Manager Window Viewing Hardware TypesClick on MIBs Supported Managing the Hub Device TypeModule Type Accessing the TR Management Station Configuration Window Management Station ConfigurationStation Name Configuration Window Setting Station Name and LocationInhibit Active Monitor Host Error Report Timer DelayEnable Beacon Recovery Specifying Ring Management FunctionsEnable Ring Poll Recovery Selecting the Ring Viewing Network InformationNetwork Information Window Fields Board Number Ring of X Configured RingsViewing Module Status Token Ring Board Status Window FieldsViewing Ring Port Status Accessing the Ring Port Status windowMedia Type Last Wire FaultRing Port Status Window Fields PortUsing the Media Type and Phantom Current Radio Buttons Setting the Device Date and Time13. Device Date Change Window Using an Uninterruptable Power Supply UPS14. The UPS Window Accessing the UPS WindowLine Voltage Battery OutputBattery Capacity UPS UptimeUsing the Disconnect Option Resetting the DeviceSetting the UPS ID Using the Test OptionEnabling and Disabling Port Mapping 15. The Port Map Window Enabling and Disabling Link TrapsEnabling and Disabling Link Traps at the Board Level Setting Token Ring Boards to AutomodeEnabling and Disabling Ports Enabling and Disabling Station PortsEnabling and Disabling Ring Ports Viewing I/F Summary Information Ring Out Enable/DisablePhysical Status IndexType DescriptionRaw Counts Interface Performance Statistics/Bar GraphsViewing Interface Detail RateUnicast AddressMaking Sense of Detail Statistics Transmitted Errors /Packets Transmitted Setting Total, Delta, or Cumulative Counts Statistics Window FeaturesToken Ring Statistics Viewing Elapsed, Average, and Peak Activity LevelsNew Timer Interval Text Box Setting the Statistics Poll IntervalGeneral Information Fields Accessing the Network Statistics SelectionsNetwork Level Statistics Network Statistics WindowActive Monitor Ring SpeedRing Status Fields Stations InsertedBeacon Statistics Soft Error FieldsBurst Errors Internal ErrorsAbort Sequences Lost Frames Congestion ErrorsToken Errors Frequency ErrorsNetwork Timer Statistics Total ErrorsNetwork Timer Statistics Window Fields Network Performance Graphs FramesKBytes Traffic Blue Configuring the Network Performance GraphNetwork Performance Graph Statistics Network Events RedTotal and Delta Graph Display Frame Size WindowFrame Sizes Window with Pie Chart Using the Pie and Bar Radio ButtonsProtocol Statistics Window Management Station Statistics Accessing the Management Station Statistics SelectionSoft Errors Fields Signals Lost FC ErrorsSoft Errors Hard Errors FieldsTransmitted Beacons RecoveriesLobe Wire Fault Hard ErrorsAccessing the Station Port Menu Port Level StatisticsStation Statistics Window Station Statistics Window Performance Fields Station Statistics Window General FieldsStation Name Link TimeStation Statistics Window Soft Error Fields Station Timer Statistics Window Port Performance Graphs Station Timer Statistics Window FieldsPort Performance Graph Statistics Total Errors RedConfiguring the Port Performance Graph Token Ring Statistics Ring-Level Alarm Limits Token Ring AlarmsRing-Level Alarm Limits for Network Events Accessing the Alarm Limits WindowToken Errors Ring-Level Station AlarmsLine Setting Ring-Level Alarm LimitsAccessing the Station Alarm Limits Window from the Port Menu Station-Level Alarm LimitsToken Ring Alarms Station Alarm Limits Window Setting Station-Level Alarm LimitsToken Ring Alarms Station List Window Station List and Station MapNumber of Nodes/Stations Address ModeStation List Window Fields General FieldsStation Fields Viewing Station StatisticsViewing Station Timer Statistics Setting Station AlarmsRemoving a Station from the Ring Using the MAC/Canonical Button Viewing the Station Port Performance GraphPrinting the Station List Station Map Resetting CountersNumber of Nodes Station Map Window FieldsStation Pop-up Text Boxes Viewing the Station MapNode Address Station Map with Text BoxesStation Command Menu Magnifying a Portion of the Map Manipulating the Station MapRotating the Station Map Resizing the Station Map Window Station List and Station Map Index SymbolsIndex-2 Index-3 Index-4
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