Fluke Network Tester Jabber, Jitter, LAN Local Area Network, Late Collision, Layer, Link Pulse

Page 93

Appendices C

Jabber

A frame greater than the maximum legal size (greater than 1518 bytes) with a good or bad frame check sequence. In general, you should not see jabbers. The most likely causes of jabbers are a faulty NIC/driver or perhaps a cabling problem.

Jitter

Variability in latency, or delay. If a network provides varying levels of latency (i.e., different waiting times) for different packets or cells, it introduces jitter, which is particularly disruptive to audio communications because it can cause audible pops and clicks.

LAN (Local Area Network)

A physical network technology used over short distances (up to a few thousand meters) to connect many workstations and network devices using a communication standard (Token Ring or Ethernet, for example).

Late Collision

A collision that occurs after the first 64 bytes in a frame. In 10BASE-T networks, late collisions will be seen as frames with a bad FCS. Causes of Late Collisions are a faulty NIC or a network that is too long. A too-long network is one in which the end-to-end signal propagation time is greater that the minimum legal sized frame.

Layer

One of seven levels in the Open Systems Interconnection (OSI) reference model. See OSI.

Link Pulse

A single-bit test pulse that is transmitted at least every 150 milliseconds during idle periods on 10BASE-T link segments to verify link integrity.

Manufacturer Prefix

The standard partial address used to identify a particular manufacturer. The prefix of the address is predefined uniquely for each manufacturer, while the remainder of the address uniquely identifies the station.

Master Browser

The Master Browser maintains the browse list, a list of all servers in the master browser’s domain or workgroup.

MBPS

Millions of bits per second. See BPS.

Multicast

Packets that are directed to a group of nodes rather than to a single node or all nodes. This is contrasted to a broadcast packet, which is directed to all nodes.

C-7

Image 93
Contents NetTool Limited Warranty and Limitation of Liability Table of Contents NetTool Iii Common Problems Appendices NetTool List of Tables Viii List of Figures NetTool Introduction Using This Manual What is NetTool?Care and Maintenance NetTool FeaturesPackage Contents Service and Adjustment Optional AccessoriesRegistering NetTool PC/NetTool Link Utility Programs Contacting Fluke NetworksNetTool Blaster Getting Acquainted Installing and Running the Link UtilitiesNetTool Toolkit Turning on NetToolLink/Collision/Error LED Understanding the LEDsUtilization LED NetTool Menus IconsMain Menu Navigation Keys ScrollingMaximizing Battery Life Power SupplyInstalling the Batteries Using the AC AdapterUpdating NetTool’s Software Setting Up and Connecting NetTool Configuring NetToolIntroduction Settings Menu Changing the System SettingsManually Assigning NetTool an IP Address Identifying Unwanted ProtocolsSelecting a Language for the Display Screens Creating a List of IP Addresses to PingObtaining Information about Your NetTool Connecting NetTool Connecting a Patch CableSingle-Ended Connection Single-Ended Connection into a Wall Jack Inline Connection between a PC Network Inline ConnectionSerial Port Connection Recommended speed setting for the serial port isRunning AutoTest AutoTestWiremap Cable Test ResultsCable Length, Opens, Shorts, and Splits Network Drop Single-Ended AutoTest ResultsNetwork Device Services NetTool Discovers DeviceInline between a Device and the Network Inline AutoTest ResultsLink and Polarity Level Indicator Definition Inline between a PoE Powered Device and the Network NetTool Verifying a Device’s Configuration Troubleshooting a Network DeviceViewing Link Status Information Link Configuration DetailsHealth Details Checking Frames for ErrorsSelect Protocols Screen Tracking ProtocolsAddresses Used Screen Obtaining a Device’s IP Address InformationVlan Information Identifying Network ResourcesNetTool Finding Out About Your Network Troubleshooting NetworksSegment ID Screen Identifying the Network TypeIdentifying Key Devices Troubleshooting NetworksPing Pinging a Single DeviceAssigning an IP Address to NetTool Ping Pinging Multiple DevicesPing Results Screen Displaying the Problem Log Common ProblemsProblem Log Understanding the Problem Log DisplayProblems NetTool Detects Link Connectivity ProblemsThings to Consider Problem Transmit pair open Health Problems Network ProblemsNetWare Problem Ethernet frame-type mismatchesTCP/IP Host ConfigurationProblem Wins resolution failed Name ResolutionNetBIOS Web Problem PC involved in MB electionsPrinter Problem Unable to connect to POP3 serverUnwanted protocols when enabled Verifying Voice over IP Service Viewing Vlan and CDP Information Viewing PoE Voltage and Pair InformationVoIP Log VoIP LogRTP drop Viewing Call Quality MeasurementsBefore You Begin Creating and Managing ReportsReporter Menu Creating a ReportDeleting or Overwriting a Report NetTool Appendix Title AppendicesPage General Specifications SpecificationsEnvironmental Requirements Temperature ApprovalsSample VoIP Call Logs Dhcp ACK Typical Cisco Skinny Sccp Phone BootupAppendices Start Media Xmit Typical Cisco Skinny Sccp Call LogSample VoIP Call Logs B Typical Cisco Skinny Sccp Call Log Typical SIP Phone Bootup Log Typical SIP Phone Bootup Log Typical SIP Call Log Typical SIP Call Log 10BASE2 Glossary802.3 Access MethodAnomaly 802.2Bridge Switch ARP Address Resolution ProtocolCharacteristic impedance AttenuationCollision ClientCrossed Pair CrosstalkEIA568 Destination AddressEncapsulation EthernetHalf-Duplex Full-DuplexIcmp Internet Control and Message Protocol IP Internet ProtocolJitter JabberLAN Local Area Network Late CollisionPing NIC Network Interface CardNode Number NVP Nominal Velocity of PropagationRemote Collision RJ-45 ConnectorRepeater Router or GatewaySignal/Noise Ratio SAP Service Advertising ProtocolRtcp Real-time Transport Control Protocol RuntsSnmp Simple Network Management Protocol Snap Subnetwork Access ProtocolSource Address Split PairUptime TopologyTransport TransceiverIndex NetTool Index NetTool