   UTP cabling specifications
                                                                    v2.00
      
      
      Specifications and recommendations for Unshielded Twisted-Pair
      (UTP) Ethernet cable
      ==============================================================
      
      The NodeRunner Pro(TM) adapters have a small, snap-in RJ45
      connector.
      
      RJ45 cabling is also known as Twisted-pair Ethernet (TPE),
      Unshielded twisted pair (UTP) and 10BASE-T.
      
      This document covers the following topics:
      
      -  Recommended cables
      
      -  Cable and connector pinouts
      
      -  Connecting two workstations without a hub
      
      -  Link integrity
      
      -  Common problems
      
      For more information on the 10BASE-T specification, contact your
      local network supplier or call the IEEE (800-678-IEEE).
      
      
      Recommended cables
      ==================
      
      The RJ45 connector can use 22, 24, or 26-gauge UTP cabling. The
      cable must comply with the IEEE 802.3 10BASE-T standard.
      
      If you're using UTP cabling in an residential environment, you must
      use a shielded cable.
      
      The cable between the computer and the hub must be less than 100
      meters long.
      
      These UTP cables work well:
      
      ------------------------------------------------------
      Manufacturer       Model number         No. of pairs
      ------------------------------------------------------
      Belden             9562                 2
      ------------------------------------------------------
      Data Set           2402                 4
      ------------------------------------------------------
      Belden             9566                 6
      ------------------------------------------------------
      
      Silver satin is not within the 10BASE-T specification and cannot be
      used.  If used, it may not work at all, or may give intermittent
      results.
      
      The NodeRunner Pro adapters do not support pre10BASE-T concentrators.
      
      
      Cable and connector pinouts
      ===========================
      
      If you need to repair a cable or provide connectors for UTP cable,
      wire straight through as shown in the following table.
      
      Use only four of the eight pins. Pins 1 and 2 must be a pair, and
      pins 3 and six must be a pair.
      
      Function    Pin#               Pin#
      -------------------------------------
      TX+        1    <-------->   1
      TX-        2    <-------->   2
      RX+        3    <-------->   3
      RX-        6    <-------->   6
      -------------------------------------
      
      To allow for a straight-through cable, the hub provides an internal
      transmit/receive crossover function. This means the transmit
      circuit of the network card is connected to the receive circuit of
      the hub and vice versa.
      
      Pinout for the RJ45 connector
      -----------------------------
      
                 ----------              --------------------------
              1 |--        |          8 |------------              |
              2 |--        |          7 |------------              |
              3 |--         ---       6 |------------              |
              4 |--            |      5 |------------              |
              5 |--            |      4 |------------              |
              6 |--         ---       3 |------------              |
              7 |--        |          2 |------------              |
              8 |--        |          1 |------------              |
                 ----------              --------------------------
                    END                             TOP
      
      Pin name and function:
      
      1  Transmit Data Plus. The positive signal for the TD differential
         pair. This signal contains the serial output data stream
         transmitted onto the network.
      
      2  Transmit Data Minus. The negative signal for the TD differential
         pair. This contains the same output as pin 1.
      
      3  Receive Data Plus. The positive signal for the RD differential
         pair. This signal contains the serial input data stream received
         from the network.
      
      4  not connected
      
      5  not connected
      
      6  Receive data minus. The negative signal for the RD differential
         pair. This signal contains the same input as pin 3.
      
      7  not connected
      
      8  not connected
      
      
      Connecting two workstations without a hub
      =========================================
      
      10BASE-T uses a star topology. This means there is a hub or
      concentrator in the center of a star and each workstation or server
      is connected to this hub.
      
      For TEST purposes, you can directly connect two workstations or a
      workstation and a server without using a hub. This requires a
      special cable that incorporates the crossover function talked about
      at the beginning of this document.
      
      Function    Pin#               Pin#   Function
      ----------------------------------------------
        TX+        1    <-------->    3       RX+
        TX-        2    <-------->    6       RX-
        RX+        3    <-------->    1       TX+
        RX-        6    <-------->    2       TX-
      ----------------------------------------------
      
      NOTE: This is not an IEEE supported configuration and should be
            used for test purposes only.
      
      
      Link integrity
      ==============
      
      For 10BASE-T networks, Link integrity (LI) needs to be on. Some
      transceivers, Ethernet cards, or other network devices allow you to
      turn it off, but Link Integrity is always on with the NodeRunner Pro
      adapters.
      
      If you're using a transceiver to go to a thick/thin Ethernet
      segment, Link Integrity must be set to on for the transceiver.
      
      
      Common problems
      ===============
      
      
      A hub can't "see" a workstation
      -------------------------------
      
      This is often caused by a crossed wire in the cable or wiring
      closet.  Check to make sure the wiring is correct.
      
      
      Workstations can't connect to the network
      -----------------------------------------
      
      If your workstations are having problems connecting, reset or power
      off/on your concentrator or hub.
      
      
      Polarity problems
      -----------------
      
      A common problem in 10BASE-T wiring is crossing the positive and
      negative phases of the transmit or receive signals. For example, a
      problem would occur if pins 1 and 2 were crossed. (TX+ connected to
      TX-).
      
      Even though the NodeRunner Pro adapters can take care of this
      crossover for you, it is best to check your wiring and correct this
      problem if you find it.
      
      
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