Near End Cross Talk Next, Patch Cables | NETGEAR 7200 Series

User Manual for the NETGEAR 7200 Series Layer 2 Managed Switch Software

Unlike 10BASE-T and 100BASE-TX, which use only two of the four pairs of wires within the Category 5, 1000BASE-T uses all four pairs of the twisted pair. Make sure all wires are tested ⎯ this is important.

Factors that affect the return loss are:

The number of transition points, as there is a connection via an RJ-45 to another connector, a patch panel, or device at each transition point.

Removing the jacket that surrounds the four pairs of twisted cable. It is highly recommended that, when RJ-45 connections are made, this is minimized to 1-1/4 inch (32 mm).

Untwisting any pair of the twisted-pair cabling. It is important that any untwisting be minimized to 3/8 inch (10 mm) for RJ-45 connections.

Cabling or bundling of multiple Category 5 cables. This is regulated by ANSI/EIA/TIA-568A-3. If not correctly implemented, this can adversely affect all cabling parameters.

Near End Cross Talk (NEXT)

This is a measure of the signal coupling from one wire to another, within a cable assembly, or among cables within a bundle. NEXT measures the amount of cross-talk disturbance energy that is detected at the near end of the link — the end where the transmitter is located. NEXT measures the amount of energy that is “returned” to the sender end. The factors that affect NEXT and cross talk are exactly the same as outlined in the Return Loss section. The cross-talk performance is directly related to the quality of the cable installation.

Patch Cables

When installing your equipment, replace old patch panel cables that do not meet Category 5e specifications. As pointed out in the NEXT section, this near end piece of cable is critical for successful operation.

RJ-45 Plug and RJ-45 Connectors

In a Fast Ethernet network, it is important that all 100BASE-T certified Category 5 cabling use RJ-45 plugs. The RJ-45 plug accepts 4-pair UTP or shielded twisted-pair (STP) 100-ohm cable and connects into the RJ-45 connector. The RJ-45 connector is used to connect stations, hubs, and switches through UTP cable; it supports 10 Mbps, 100 Mbps, or 1000 Mbps data transmission.

A-6	Cabling Guidelines

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NETGEAR 7200 Series user manual Near End Cross Talk Next, Patch Cables, RJ-45 Plug and RJ-45 Connectors

Contents

202-10010-01 Technical Support Canadian Department of Communications Compliance Statement 202-10010-01 Contents Chapter Quick Startup 202-10010-01 202-10010-01 Contents 202-10010-01 Security Commands System Utilities Contents Xiii Index Thank you for purchasing the Netgear GSM7224 L2 Switch Why the Document was CreatedHow to Use This Document Chapter About This Guide Special Message Formats Typographical ConventionsThis guide uses the following typographical conventions Features of the Html Version of this Manual Html version of this manual includes these features How to Print this Manual Chapter Switch Management OverviewScope Comparing Switch Management Methods Management Method Advantages Disadvantages Commands are followed by values, parameters or both Chapter Command Line Interface SyntaxFormat Parameters CommandValues Conventions Address Type Format Range Annotations Administration Console Telnet Interface Set Up Your Switch Using Direct Console Access Connection Description Connection Settings Administration Console Telnet Interface Chapter Web-Based Management Interface Web Based Management Overview How to Log In to the GSM7224 GSM7224 IP address in browser address bar Interactive Switch Image Web-Based Management Utility FeaturesMenus System-Wide Popup Menus Port-Specific Popup Menus Quick Starting the Switch Chapter Quick Startup Command Details System Info and System SetupThere are several categories of Quick Startup commands Quick Startup Software Version Information Quick Startup User Account Management Port when Slot value isQuick Startup Physical Port Data Ports Quick Startup IP Address Default is enable Config network parms Quick Startup Uploading from Switch to Out-of-Band PC Only Quick Startup Downloading from Tftp Server Quick Startup Factory DefaultsTransfer download mode Tftp Transfer download filename name Vlan Configuration Example Command Solution Quick Startup This command displays inventory information for the switch Chapter Switching CommandsSystem Information and Statistics Commands Show inventory Config sysname name Config sysnameThis command displays switch information Show sysinfo Show arp switch Config syslocationConfig syscontact Show forwardingdb table Show forwardingdb learned vlanplusmacaddr/all Show forwardingdb learnedShow stats port detailed Show stats port detailed slot.port Packets Received with MAC Errors Packets Received Successfully Received Packets not forwarded Packets Transmitted Octets Transmit ErrorsPackets Transmitted Successfully Transmit Discards Protocol Statistics Show stats port summary Show stats port summary slot.port Show stats switch detailed Show stats switch detailed This command displays a count of all CPU traffic Show stats switch summaryShow stats switch summary Show msglog Show eventlogShow traplog Config network macaddr Management CommandsShow network Config network protocol Config network mactypeConfig network parms Config network webmode Config prompt Config network javamodeShow serial Show serviceport Config serial baudrateConfig serial timeout Config serviceport parms Show snmpcommunity Config snmpcommunity accessmodeConfig snmpcommunity accessmode rorw name Show snmpcommunity Config snmpcommunity ipaddr Config snmpcommunity createConfig snmpcommunity delete Config snmpcommunity ipmask Config snmptrap delete Config snmpcommunity modeConfig snmptrap create This command deletes trap receivers for a community Show trapflags Config snmptrap ipaddrConfig snmptrap mode Show trapflags Config trapflags linkmode Config trapflags authenticationConfig trapflags bcaststorm Config trapflags multiusers Config telnet timeout Config telnet maxsessionsConfig telnet mode This command displays telnet settings This section describes device configuration commands Device Configuration CommandsConfig forwardingdb agetime Show forwardingdb agetime Config switchconfig flowcontrol Show switchconfigConfig switchconfig broadcast Show port This command enables or disables a port Config port adminmodeConfig port flowcontrol Config port adminmode slot.portall Config port lacpmode Config port linktrapConfig port physicalmode Config port autoneg Config lag deleteport Config lag createConfig lag addport Config lag create name Config lag name Config lag adminmodeConfig lag linktrap Config lag deletelag Show vlan summary Mode is one of the followingThis command displays a list of all configured VLANs Show vlan detailed Config vlan name Config vlan createConfig vlan delete Config vlan create Config vlan port tagging Config vlan makestaticConfig vlan participation Participation options are This command displays Vlan port information Config vlan port pvidConfig vlan port acceptframe This command changes the Vlan ID per interface Config protocol delete Config vlan port ingressfilterConfig protocol create Show protocol Config protocol vlan add Config protocol protocol addConfig protocol protocol remove Config protocol vlan remove Show garp info Config protocol interface addConfig protocol interface remove Show garp interface Config garp gmrp adminmode Config garp gmrp interface mode Config garp jointimer Config garp gvrp adminmodeConfig garp gvrp interface mode Config garp leavetimer Show igmpsnooping Config garp leavealltimerConfig garp leavealltimer slot.port/all Show igmpsnooping Config igmpsnooping maxresponse Config igmpsnooping adminmodeConfig igmpsnooping groupmembershipinterval Config igmpsnooping mcrtrexpiretime Show mfdb gmrp Config igmpsnooping interface modeShow mfdb table Show mfdb table macaddr/all Show mfdb igmpsnooping Show mfdb igmpsnoopingShow mfdb staticfiltering Show mfdb staticfiltering Show mfdb stats Config mirroring createShow mirroring Config macfilter create Config mirroring deleteConfig mirroring mode Show macfilter Config macfilter addsrc Config macfilter removeConfig macfilter delsrc Config macfilter adddest Spanning Tree CommandsConfig macfilter deldest Show spanningtree summary Config spanningtree adminmodeConfig spaningtree adminmode enable/disable Show spanningtree summary Config spanningtree configuration revision Config spanningtree forceversionConfig spanningtree configuration name Show spanningtree port This command displays spanning tree settings for the bridge Config spanningtree port migrationcheckConfig spanningtree port mode Show spanningtree bridge Config spanningtree bridge forwarddelay Config spanningtree bridge maxageConfig spanningtree bridge hellotime Config spanningtree bridge priority Show spanningtree cst detailed Show spanningtree cst port summaryShow spanningtree cst port summary slot.port/all Show spanningtree cst port detailed Config spanningtree cst port pathcostConfig spanningtree cst port pathcost slot.port Show spanningtree cst port detailed slot.port Config spanningtree mst create Config spanningtree cst port priorityConfig spanningtree cst port edgeport Config spanningtree mst delete Config spanningtree mst priority Config spanningtree mst vlan addConfig spanningtree mst vlan remove Config spanningtree mst port pathcost Show spanningtree mst summary Config spanningtree mst port priorityShow spanningtree mst detailed Show spanningtree mst port detailed Show spanningtree mst port summaryShow spanningtree vlan These commands manage user accounts User Account Management CommandsConfig users add Config users add name Config users snmpv3 authentication Config users passwdConfig users delete Config users snmpv3 encryption Show loginsession Security CommandsConfig users snmpv3 accessmode Config loginsession close Config radius accounting mode Config radius maxretransmitConfig radius timeout Config radius maxretransmit Config radius accounting server remove Config radius accounting server addConfig radius accounting server port Config radius accounting server secret Config radius server remove Config radius server addConfig radius server port Config radius server secret This command displays the configured Radius servers Config radius server primaryConfig radius server msgauth Show radius summary Show radius server stats Show radius accounting summary Show radius accounting stats Config dot1x port reauthenticate Config dot1x adminmodeConfig dot1x port initialize Show radius stats Config dot1x port quietperiod Config dot1x port controldirConfig dot1x port controlmode Config dot1x port quietperiod slot.port Config dot1x port servertimeout Config dot1x port transmitperiodConfig dot1x port supptimeout Config dot1x port maxrequests Show dot1x port summary Config dot1x port reauthenabledShow dot1x summary Show dot1x port detailed Show dot1x port stats Config authentication login create Clear dot1x port stats Config authentication login delete Config authentication login set Config dot1x port users add Config dot1x defaultloginConfig dot1x login Config dot1x port users remove Show authentication login users Config users loginShow authentication login info Show dot1x port users Transfer upload mode Show users authenticationSave config System Utilities Transfer upload path Transfer upload mode xmodemtftpTransfer upload serverip Transfer upload serverip ipaddr Transfer upload datatype Transfer download modeTransfer upload filename Transfer upload start Transfer download filename Transfer download serveripTransfer download path Transfer download datatype Clear transfer Clear configTransfer download start Clear pass Clear lag Clear stats switchReset system Clear stats port Ping Chapter Differentiated Services Config diffserv adminmode enable/disable Differentiated Services Appendix a Cabling Guidelines Fast Ethernet Cable Guidelines Category 5 Cable Specifications Category 5 Cable Twisted Pair Cables 1illustrates straight-through twisted pair cable Patch Panels and Cables 2illustrates crossover twisted pair cable Using 1000BASE-T Gigabit Ethernet over Category 5 Cable Cabling Near End Cross Talk Next RJ-45 Plug and RJ-45 ConnectorsPatch Cables PIN Normal Assignment on Uplink Assignment on Ports 1 to Conclusion 802.1P Appendix B GlossaryNumeric 802.1Q Vlan Auto-negotiation 1000BASE-TAging Auto Uplink Baud BootPBootstrap Protocol Bridge Protocol Data Unit Collision Command Line InterfaceDifferentiated Services Diffserv Electronically Erasable Programmable Read Only Memory Dynamic Host Configuration ProtocolDomain Name Endstation Fast Ethernet Fault isolationEthernet Fast STP Garp Vlan Registration Protocol Garp Information PropagationGarp Multicast Registration Protocol Gateway Igmp Snooping Half-duplexInternet Group Management Protocol Learning IP MulticastingInternet Protocol Load balancing Management Information Base Local Area NetworkLoop Mbps Netmask MulticastingMultiplexing Non-stub area Point-to-Point Protocol Open Systems InterconnectionPacket Port Mirroring Port trunking Quality of ServicePort monitoring Protocol Router Resource Reservation Setup ProtocolSimple Network Management Protocol Spanning Tree SimpleX signalingSpanning Tree Protocol STP Telnet SwitchStub area Traffic prioritization Virtual Local Area Network TrunkingWeb Wide Area Network Windows Internet Naming ServiceXModem Index ARP Index Gvrp Index Index STP Tftp Xmodem