____________________________     1           Modem End               19
  | Modem End   |   Device End |   _|___________________________________|_
  | DB-37  _____|____    HD-15 |  | . . . . . . . . . . . . . . . . . . . |
  | pin   |  Signal  |     pin |   \ . . . . . . . . . . . . . . . . . . /
  |_______|_____|____|_________|     |_________________________________|
  |  6    RD-   | RxD-      6  |    20           Male DB-37            37
  | 24    RD+   | RxD+      7  |
  |  8    RT-   | RxC-      9  |
  | 26    RT+   | RxC+     10  |                         1
  |  4    SD-   | TxD-      1  |       Device End      __|__________
  | 22    SD+   | TxD+      2  |                      |  o o o o o  |
  |  5    ST-   | TxC-      4  |                    6-- o o o o o   |
  | 23    ST+   | TxC+      5  |                       \ o o o o o /
  | 19    ShGnd |ShGnd     12  |                         |_______|
  |_____________|______________|                         11       15

      Up to 100ft - 24 AWG - max12.5                 en 9929 or equivalent
          Controller line baud rates of 57.6 Kbps or less recommended.




   __________________           ______________
  | 128-Port        1|----NG---|EIA-422 Modem |------ -.
  | Adapter         2|         |______________|        |
  |_______          _|                                 |
          ||||||||_|         .----- TEL Lines   - - - -'
                             |
                             |   _____________
                             '--|EIA-422 Modem|--NH------. .--------.
                                |_____________|          | |        |
                                                        _|_|_      _|_T_
                                                       |Node1|    |Node2|
                                                       |_____|    |_____|