THOMAS-CONRAD CORPORATION

TC6842 (FOR THE MACINTOSH)

NIC Type      ARCnet
Transfer Rate 2.5Mbps
Data Bus      32-Bit NuBus
Topology      Star
Wiring Type   RG62/U 93ohm coaxial
Boot ROM      Not Available

[Image]

                               NODE ADDRESS

   Node     SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

  »   1     Off      On      On      On      On      On      On      On

      0      -       -       -       -       -       -       -       -

      2      On     Off      On      On      On      On      On      On

      3     Off     Off      On      On      On      On      On      On

      4      On      On     Off      On      On      On      On      On

      251   Off     Off      On     Off     Off     Off     Off     Off

      252    On      On     Off     Off     Off     Off     Off     Off

      253   Off      On     Off     Off     Off     Off     Off     Off

      254    -       -       -       -       -       -       -       -

      255    -       -       -       -       -       -       -       -

       Note:Node address 0 is used for messaging between nodes and must
       not be used. Node addresses 254 &255 are reserved for AppleTalk
       network broadcast messages and also must not be used.

       A total of 253 node address settings are available. The switches
       are a binary representation of the decimal node addresses. Switch
       1 is the Least Significant Bit and switch 8 is the Most
       Significant Bit. The switches have the following decimal values:
       switch 1=1, 2=2, 3=4, 4=8, 5=16, 6=32, 7=64, 8=128. Turn off the
       switches and add the values of the off switches to obtain the
       correct node address. (On=0, Off=1)

            CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS

  Cable Length      Response     Reconfiguration       JP1         JP2
                     Time

  »    < 20,000    74.7 m s           840ms            Open       Open
        feet

       > 20,000    283.4 m s          1680ms          Closed      Open
        feet

       > 20,000    561.8 m s          1680ms           Open      Closed
        feet

       > 20,000    1118.6 m s         1680ms          Closed     Closed
        feet

  Note: All NICs on the network must have this option set the same.