BNC cabling specifications
                                                                    v1.00
      
      
      Specifications and recommendations for Thin Ethernet cable
      ==========================================================
      
      The EtherExpress(TM) PRO/10 PCI adapters have a cylindrical,
      bayonet BNC connector.
      
      Note: There's two types of adapters - one with AUI, BNC, and TPE
            connectors and one with a TPE connector only.
      
      BNC cabling is also known as thin Ethernet, RG-58A/U, Cheapernet,
      and 10BASE-2.
      
      This document contains cabling and installation recommendations.
      For more information on thin Ethernet cabling, contact your local
      network supplier or call the IEEE at 1-800-678-IEEE.
      
      
      Recommended cables
      ==================
      
      Here is a list of IEEE approved and non-approved cables.
      
      Approved cable types
      ------------------------------------------------
      802.3 10Base2     50 ohms, stranded tinned core
      RG-58 a/u         50 ohms, stranded tinned core
      RG-58 c/u         50 ohms, stranded tinned core
      ------------------------------------------------
      
      NON-Approved cable types
      ------------------------------------------------
      RG-58             50 ohms, solid center core
      RG-58 u           50 ohms, solid center core
      ------------------------------------------------
      
      Installation recommendations
      ============================
      
      Thin Ethernet is a linear bus topology that uses a COAX cable.  A
      break in the cable will disrupt the entire segment.  Each node is
      connected to the cable using a T-connector.
      
      -  Don't connect the end of the cable directly to the BNC connector
         on the EtherExpress card.
      
      -  Don't use cable drops or external transceivers unless you are
         using the AUI connector instead of the BNC connector.
      
      Both ends of a trunk must be terminated with 50 ohm terminators.
      One end should be grounded.
      
      Up to 5 trunk segments may be connected (through repeaters), but
      only 3 of these segments can have workstations attached.  Repeaters
      count as a workstation so if you have two repeaters on a segment,
      then the maximum number of user workstations is 28.
      
      Example:
                     no workstations               no workstations
                            |                             |
                            v                             v
      |--+--------+  +--------+  +------+-------+  +-------+  +----+----|
       |          |  |        |  |      |       |  |       |  |    |
       |        repeater     repeater   |     repeater   repeater  |
       |                                |                          |
      workstation                   workstation              workstation
         1-29                          1-28                       1-29
      
      Cable lengths
      ------------------------------------------------------------------
      Max trunk length                185 meters (607 feet)
      Max number of nodes per trunk    30
      Max number of trunks              5 (only 3 can have wkst attached)
      Max length of entire network    925 meters (3035 feet)
         (all trunks added together)
      Min cable length between nodes   .5 meters (1 1/2 feet)
      ------------------------------------------------------------------