Cabletron Systems NB30 manual Out of Window Coll. Ethernet Port Only, CRC Errors, Frame Alignments

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NB-30 Bridging

Out of Window Coll. (Ethernet Port Only)

The number of collisions at this port that were out of the standard collision window (51.2µs) due to a network problem experienced by the bridge. The problem may be that the network length exceeds speciÞcations, or that a node is transmitting without listening for carrier sense.

CRC Errors

The total number of frames received by the port that had Cyclical Redundancy Check (CRC) errors. A CRC error indicates the packet was damaged in transit Ñ since a frame check sequence of the packet does not match that recorded in the frame by the transmitting station.

Frame Alignments

The number of frames received by the port from the network that were misaligned Ñ that is, in which a byte of data in the packet contained less than 8 bits. This may indicate a packet formation problem on the part of a node, a problem of interference with the cabling, or a network design with cascaded multi-port transceivers (which does not meet IEEE 802.3 speciÞcations).

Giant Packets (Ethernet Port Only)

The number of giant frames the Ethernet port has received from the network. A giant frame exceeds the maximum Ethernet frame size of 1518 bytes (excluding the preamble).

Timeout (Remote Port Only)

The number of frames that were discarded because the maximum time for forwarding was exceeded before it could be transmitted by the remote port.

Total Errors

The total number of any errors processed by the selected port.

Nothing

The selected scale is not currently in use.

Configuring Performance Graphs

To conÞgure the Bridge Performance Graph:

1.Using the mouse, click on a scale button. A menu will appear.

For the Bridge Performance Graph, Frames Forwarded appears next to the blue scale by default; Frames Received appears next to the red scale.

For the Ethernet Port Performance Graph, Collisions appears next to the blue scale by default; Frames Received appears next to the red scale.

For the Remote Port Performance Graph, Forwarded Outbound appears next to the blue scale by default; Frames Received appears next to the red scale.

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Bridge Statistics

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Contents NB30 User’s Guide Page Virus Disclaimer Page Restricted Rights Notice Page Contents Contents IndexUsing the NB-30 Bridge User’s Guide IntroductionRelated Manuals IntroductionUsing the Mouse Software ConventionsCommon NB-30 Bridge Window Fields Device DescriptionUsing Window Buttons Getting Help Using On-line HelpAccessing On-line Documentation NB-30 Bridge Firmware Getting Help from the Cabletron Systems Global Call CenterIntroduction NB-30 Bridge Firmware NB-30 Bridge Chassis View Viewing Chassis Information Front Panel Information Menu Structure DateHelp Menu Device MenuUtilities Menu Board MenuNB-30 Bridge Port Status Display Chassis ManagerManaging the Bridge Viewing Hardware TypesSetting the Device Date and Time Edit Date WindowEnabling and Disabling Bridging NB-30 Bridge Chassis View Managing the Bridge NB-30 Bridging Bridging BasicsAbout Transparent Bridging Viewing and Managing Bridging InterfacesBridge Status Bridge Status Condition Bridge LocationBridge State on Interface OK/SQE onBridge Status on Remote Port Interface Bridge Port Address Local Ethernet Port Interface NameInterface Type Segment NameAccessing Bridge Status Window Options Enabling and Disabling BridgingBridge Statistics Performance GraphsFrames Filtered Frames ForwardedFrames Received Discarded Inbound Ethernet Port Only Device ErrorsNothing Forwarded OutboundTotal Errors CRC ErrorsTimeout Remote Port Only Out of Window Coll. Ethernet Port OnlyBridge Summary Statistics Bridge Summary Statistics WindowEthernet and Remote Port Statistics Remote Port Statistics Window OOW Ethernet Port Only Packets Filtered Blue Ethernet Port OnlyXmit Aborts Ethernet Port Only Framing TimeoutBridge Spanning Tree GiantsBridge Spanning Tree Window Bridge Level Parameters Hello Time Forwarding DelayProtocol Max AgeBridge Port Level Parameters Changing Bridge Priority Configuring Spanning TreeTopology Changing the Spanning Tree Algorithm Protocol TypeChanging Max Age Time Changing Forwarding Delay TimeChanging Hello Time Changing Path Cost Filtering DatabaseChanging Port Priority NB-30 Bridging Capacity TypeNumber Ageing TimeAddress Configuring the Filtering DatabaseList Port FilteringAdding or Deleting Individual Filtering Database Entries Changing the Type of EntryChanging the Port Filtering Action DSX-1 Summary Erasing Entries from the Permanent or Acquired DatabasesConfiguring, Running, and Checking the Loopback Test Bridge DSX-1 Summary WindowRestoring Bridge Defaults Viewing the T1 Link Channel StatusSelect Reset Counters Resetting Bridge CountersSelect Restore Defaults Restarting the BridgeNB-30 Bridging Restarting the Bridge NB-30 Bridging Restarting the Bridge Index Index-2 Index-3 Index Index-4

NB30 specifications

Cabletron Systems NB30 is a noteworthy networking device that emerged in the mid-1990s as a critical component for businesses looking to enhance their local area network (LAN) capabilities. Designed primarily for the burgeoning demand of network speed and reliability, the NB30 served as a bridge in networking technology, offering organizations a robust solution to keep up with the advancing digital landscape.

One of the main features of the Cabletron NB30 is its ability to support both Ethernet and Token Ring protocols. This dual compatibility made it an attractive choice for enterprises that were transitioning from older networking systems to newer infrastructures. By accommodating both technologies, the NB30 enabled smoother migrations without necessitating a complete overhaul of existing networking components.

Another significant characteristic of the NB30 is its modular architecture. This design allowed organizations to customize their networking setup according to specific needs and preferences. Users could add or replace modules to enhance functionality, from extra ports to support additional devices or advanced features like network management tools, ensuring that their systems could grow and evolve in tandem with their business requirements.

The NB30 also utilized a stackable design, which facilitated scalability. Organizations could easily connect multiple NB30 units to increase their network capacity and performance. This stacking capability was a significant advantage as it allowed for efficient use of space and resources while providing a path for future growth.

In terms of performance, the Cabletron NB30 boasted a switching capacity that enabled quick data transfer rates, reducing latency and improving overall network responsiveness. This speed was crucial during a period when businesses were increasingly reliant on real-time data exchange and communication.

Additionally, the NB30 incorporated advanced network management features, enabling administrators to monitor traffic, diagnose issues, and implement changes with ease. This level of control was essential for maintaining network health, ensuring that businesses remained operational without unnecessary downtimes.

Overall, Cabletron Systems NB30 played a pivotal role in the evolution of networking technology. Its combination of protocol flexibility, modular design, scalability, and robust performance made it a popular choice for businesses looking to create efficient, dependable networks in an era of rapid technological advancement. The NB30's legacy continues to influence modern networking solutions, demonstrating the importance of adaptability and performance in the ever-changing digital world.
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