ITEM: C3809L

Ethernet specifications on 10base2, 10base5, and 10baseT

I: TCP/IP CABLE SPECIFICATIONS

   These cable specifications are intended as guidelines only. It is
   a customers responsibility to ensure that cabling components
   appropriate for operating an Ethernet* network are used.

   THICK ETHERNET CABLE SYSTEM SPECIFICATIONS (10base5):

      Item                    Specification

      Cable Type              Ethernet 50-ohm PVC or teflon FEP coaxial

      Connectors              N-series

      Termination             Segment ends not attached to repeaters
                              must be terminated with 50 ohm
                              terminators

      Transceiver Cable       Four-stranded, twisted-pair conductors
    (adapter to tranceiver)   with an overall shield and insulating
                              jacket.

      Data Rate               10 Megabits/sec

      Maximum length of any   500 meters (0.31 miles)
      Baseband cable Segment

      distances between       2.5 meters (8.2 feet) multiples
      transceivers

      Maximum number of       100 transceivers
      transceivers per
      cable segment

      Maximum number of       1024 adapters
      stations in a network
      using repeaters

      Maximum length of       50 meters (164 feet)
      transceiver cable

      Electrical Specifications:
         Impedance            50 ohms (+/- 2)
         Attenuation          8.5 dB for 500 meters at 10 MHz
         Maximum Propagation
          Delay/Segment       2165 nanoseconds
         DC resistance        5 ohms per segment

   THICK ETHERNET CABLE MECHANICAL REQUIREMENTS (10base5):

      The mechanical requirements for the Ethernet cable are as follows:

      Item                   
      Inside diameter of      6.15 mm (0.242 inches) min.
      innermost shield

      External shield         90% + tinned copper braid with an outside
                              diameter of 8.28 mm + 0.178 mm (0.326
                              inches + 0.007 in.)

      Jacket's outside        9.27 mm (0.365 inches) min, 10.54 mm
                              (0.415 inches) max.

      Markings                Cable normally marked at 2.5 meter
                              increments showing location where
                              transceievers may be placed.

      Concentricity           0.51 (0.020 inches) O.C.

      Cable concentricity must be such that the center of the core
      conductor is within 0.51 mm (0.020 inches) of its ideal concentric
      position with respect to the jacket.

----------  ----------  ----------  ----------  ----------  ----------

   THIN COAXIAL ETHERNET CABLE SYSTEM SPECIFICATIONS (10base2):

      Item                    Specification

      Main Bus Cable Type     RG-58A/U, 50-ohm coaxial cable

      Connectors              BNC type

      Termination             Segment ends not attached to repeaters
                              must be terminated with 50 ohm
                              terminators

      Transceiver cable type  Four-stranded, shielded twist-pair
                              conductors with overall shield and
                              insulating jacket.

      Data Rate               10 Megabits/sec

      Maximum length of any   185 meters (600 feet)
      thin coaxial cable
      segment

      Minimum distance        0.5 meter  (1.65 feet)
      between transceivers
      or "t-connectors"

      Maximum number of       30 transceivers
      transceivers per
      cable segment

      Maximum transceiver     50 meters (164 feet)
      cable length from

      adapter to transceiver

      Electrical Specifications
        Impedance             50 ohms (+/- 2)
        Attenuation           8.5 dB for 185 meters at 10 MHz
        Max. Propagation
         Delay/Segment        950 nanoseconds
        DC resistance         10 ohms per segment
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   TWISTED-PAIR ETHERNET CABLE SYSTEM SPECIFICATIONS (10baseT):

      Item                    Specification

      Cable Type              2 unshielded twisted-pairs (UTP)
                              0.4 mm AWG 26
                              0.5 mm AWG 24 (most widely used)
                              0.6 mm AWG 22

      Connectors              RJ-45

      Termination             No external terminators are required

      Data Rate               10 Megabits/sec

      Single segment length   100 meters (328 feet)

        Note that segments are strictly point-to-point. i.e.
        DTE to multiport repeater (which typically has several RJ45
        connections)

      Maximum number of       2 multiport repeaters
      repeaters per
      cable segment

      Electrical Specifications
        Impedance             85 - 111 ohms (nominal 100)
        Attenuation           8.5 - 10 dB for 100 meters at 10 MHz
        Max. Propagation
         Delay/Segment        1000 nanoseconds
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Support Line: Ethernet specifications on 10base2, 10base5, and 10baseT ITEM: C3809L

Dated: November 1994 Category: N/A

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