____________________________
                        | System End  |   Device End |
        System End      | HD-15  _____|____    HD-15 |     Device End
                        | pin   |  Signal  |     pin |
         1              |_______|__________|_________|              1
       __|__________    |  1     RxD- | TxD-      1  |    __________|__
      |  . . . . .  |   |  2     RxD+ | TxD+      2  |   |  o o o o o  |
    6-- . . . . .   |   |  4     RxC- | TxC-      4  |   |   o o o o o--6
       \ . . . . . /    |  5     RxC+ | TxC+      5  |    \ o o o o o /
        '|-------|'     |  6     TxD- | RxD-      6  |      '-------|
        11       15     |  7     TxD+ | RxD+      7  |              11
                        |  9     TxC- | RxC-      9  |
                        | 10     TxC+ | RxC+     10  |
                        | Shell ShGnd | ShGnd        |
                        |_____________|______________|

         <=1000ft 28 AWG - max16pF/f -  type Belden 9806 or equivalent
          >1000ft 24 AWG - max16pF/f  - type Belden 9831 or equivalent


   __________________
  | 128-Port        1|---NB/NC-------.
  | Adapter         2|---NB/NC--     |  _NB/NC__   _NB/NC _   _NB/NC__
  |_______          _|          |   _|_|_      _|_|_      _|_|_      _|_T_
          |||||||__|            |  |Node1|    |Node2|    |Node3|    |Node4|
                                |  |_____|    |_____|    |_____|    |_____|
                                |
                                |
                                |
                                |  _NB/NC__   _NB/NC _   _NB/NC__
                               _|_|_      _|_|_      _|_|_      _|_T_
                              |Node1|    |Node2|    |Node3|    |Node4|
                              |_____|    |_____|    |_____|    |_____|

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|
                              |_____|    |_____|    |_____|    |_____|

Cable NE - Controller-to-Modem & Cable NF - Modem-to-RAN

   __________________           _____                          _____              _____      _____
  | 128-Port        1|____NE___|Modem|  _  Telephone line  _  |Modem|______NF____|Node1|____|Node2|T
  | Adapter         2|         |_____|                        |_____|            |_____|    |_____|
  |_______          _|
          ||||||||_|


                 CABLE NE                                     CABLE  NF
     _________________________________              _________________________________
    |                                 |            |                                 |
    | System End     |      Modem End |            |  Modem End     |       Ran End  |
    | HD-15 Male     |     DB-25 Male |            |  DB-25 Male    |  HD-15 Female  |
    | Signal         |         Signal |            |  Signal        |        Signal  |
    |________________|________________|            |________________|________________|
    |                                 |            |                                 |
    |  RxD  1 _______________   3 RxD |            | RxD   3 _______________  6  RxD |
    |                                 |            |                                 |
    |  RxC  4 _______________  17 RxC |            | RxC  17 _______________  9  RxC |
    |                |                |            |                  |              |
    |                *                |            |                  *              |
    |       5 _______|                |            |                  |_____ 10      |
    |                                 |            |                                 |
    |  TxD  6 _______________   2 TxD |            | TxD   2 _______________  1  TxD |
    |                                 |            |                                 |
    |  TxC  9 _______________  15 TxC |            |  TxC 15 _______________  4  TxC |
    |               |                 |            |                  |              |
    |               *                 |            |                  *              |
    |      10 ______|                 |            |                  |_____  5      |
    |                                 |            |                                 |
    |   SG 12 _______________   7 SG  |            |   SG  7 _______________ 12   SG |
    |                                 |            |                                 |
    | FGND Shell _______ Shell,1 FGND |            | FGND Shell,1 _______ Shell FGND |
    |                                 |            |                                 |
    |                     ___  4      |            |       4 ___                     |
    |                    |            |            |            |                    |
    | * 2200pf Capacitor |___  6      |            |       6 ___|                    |
    |                    |            |            |            |                    |
    |                    |___ 20      |            |      20 ___|                    |
    |_________________________________|            |_________________________________|
      * = 2200pf Capacitor

                System End                                    Modem End
               1
             __|__________                             1      Male DB-25      13
            |  . . . . .  |                           _|_______________________|_
          6-- . . . . .   |                          | . . . . . . . . . . . . . |
             \ . . . . . /                            \ . . . . . . . . . . . . /
               |--------'                               |_____________________|
              11                                       14                    25

       1      Modem End       13
      _|_______________________|_
     | . . . . . . . . . . . . . |                              RAN End
      \ . . . . . . . . . . . . /                              1
        |_____________________|                              __|__________
       14     Male DB-25     25                             |  o o o o o  |
                                                          6-- o o o o o   |
                                                             \ o o o o o /
                                                               |_______|
                                                              11       15


      Up to 100ft - 24 AWG - max12.5pF/f  - type Belden 9929 or equivalent
          Controller line baud rates of 19.2 Kbps or less recommended.