Cable ND 128-Port Async Controller Cable 4-wires There is no IBM P/N for this cable This is customer supplied

                         ____________________________
        System End      | System End  |   Device End |
                        | HD-15  _____|____    HD-15 |       Device End
        1               | pin   |  Signal  |     pin |               1
      __|__________     |_______|__________|_________|     __________|__
     |  . . . . .  |    |  1     RxD- | TxD-      1  |    |  o o o o o  |
   6-- . . . . .   |    |  2     RxD+ | TxD+      2  |    |   o o o o o--6
      \ . . . . . /     |  6     TxD- | RxD-      6  |     \ o o o o o /
        |-------|       |  7     TxD+ | RxD+      7  |      '--------|'
       11       15      | Shell ShGnd | ShGnd  Shell |               11
                        |_____________|______________|


         <=1000ft 28 AWG - max16pF/f - type Belden 9804 or equivalent
         >1000ft 24 AWG - max16pF/f - type Belden 9829 or equivalent


   __________________
  | 128-Port        1|---ND----------.
  | Adapter         2|---ND-----     |  ___ND___   ___ND___   __ND____
  |_______          _|          |   _|_|_      _|_|_      _|_|_      _|_T_
          |||||||__|            |  |Node1|    |Node2|    |Node3|    |Node4|
                                |  |_____|    |_____|    |_____|    |_____|
                                |
                                |
                                |
                                |  __NB____   __ND__ _   __ND____
                               _|_|_      _|_|_      _|_|_      _|_T_
                              |Node1|    |Node2|    |Node3|    |Node4|
                              |_____|    |_____|    |_____|    |_____|