Enterasys Networks 7H4385-49 Connecting to the Network

Connecting to the Network

DFE-Platinum Series Hardware Installation Guide 3-15

Connecting to the Network

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

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

7H4385‐49”onpage3‐15).

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 obta in manuals, refe r 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. Category3

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