Cabling................Thin ethernet

  This document contains some cabling information for thin ethernet 
  (10Base2) networks.  For more information thin ethernet, contact 
  your local network supplier or call the IEEE (800-678-IEEE).

  Thin ethernet is a linear bus topology that uses a COAX cable.  
  If their is a break in the cable it will disrupt the entire segment.

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

  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)
  ---------------------------------------------------------------------
   

  Each node is connected to the cable using a T-connector.
   - Do not connect the end of the cable directly to the BNC connector 
     on the EtherExpress card.  
   - Do not 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