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Enterasys Networks 7H4385-49 Computer Hardware User Manual

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Connecting to the Network

DFE-Platinum Series Hardware Installation Guide 3-15

Connecting to the Network

Thissectionprovidestheproceduresforconnectingunsh ieldedtwistedpair(UTP)

segmentsfromthenetworkorotherdevicestothe7H4385‐49(“ConnectingUTPCablesto

7H4385‐49”onpage 3‐15).

Connecting UTP Cables to 7H4385-49

ThefixedRJ45frontpanelconnectionsofthe7H4385‐49are10/100Mbpsports.These

portshaveinternalcrossovers,andsupportautomatic‐polaritysensingwhenconfigured

forautomatic‐negotiation.

Ifautomatic‐negotiationisnotactivatedonaport,useastraight‐throughcablewhen

connectingaworkstationtotheport.When

connectinganetworkingdevicetotheport,

suchasabridge,repeater,orrouter,useacrossovercable.

Ifaportissetforauto‐negotiation,automatic‐polaritysensingisalsoactivated.

Automatic‐polaritysensingeliminatestheneedforacrossovercable,regardlessifthe

connectionistoanothernetworkdevice

oraworkstation.

TheRJ45fixedfrontpanelconnectorsofthe7H4385‐49alsosupportPoE‐compliant

connectionstoPDs(powereddevices)thatrequire48VdcthroughtheUTPcableto

operate.Whetherthe48VdcisavailablethroughthebackplaneofanN5chassisor

externallyfromanN‐POE

PowerSystem,youcanverifyifthereispowerateachportas

describedlaterinthisprocedure.

Note: If the DFE module is being installed in a network using Link Aggregation, there are

rules concerning the network cable and port configurations that must be followed for Link

Aggregation to operate properly. Before connecting the cables, refer to the Enterasys

Matrix DFE-Platinum Series Configuration Guide for the configuration information. For

details on how to obtain manuals, refer to the “Related Documents” in About This Guide.

Note: All RJ45 front panel ports on the 7H4385-49 support Category 5 Unshielded

Twisted Pair (UTP) cabling with an impedance between 85 and 111 ohms. Category 3

cable may be used if the connection is going to be used only for 10 Mbps.

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