_________________________________
              System End               | System End     |      Modem End |
             1                         | HD-15 Male     |     DB-25 Male |
           __|__________               | Signal         |         Signal |
          |  . . . . .  |              |________________|________________|
        6-- . . . . .   |              |                                 |
           \ . . . . . /               |  RxD  1 _______________   3 RxD |
             |--------'                |                                 |
            11                         |  RxC  4 _______________  17 RxC |
                                       |                |                |
     1      Modem End       13         |                *                |
    _|_______________________|_        |       5 _______|                |
   | . . . . . . . . . . . . . |       |                                 |
    \ . . . . . . . . . . . . /        |  TxD  6 _______________   2 TxD |
      |_____________________|          |                                 |
     14     Male DB-25     25          |  TxC  9 _______________  15 TxC |
                                       |               |                 |
                                       |               *                 |
                                       |      10 ______|                 |
                                       |                                 |
                                       |   SG 12 _______________   7 SG  |
                                       |                                 |
                                       | FGND Shell _______ Shell,1 FGND |
                                       |                                 |
                                       |                     ___  4      |
                                       |                    |            |
                                       | * 2200pf Capacitor |___  6      |
                                       |                    |            |
                                       |                    |___ 20      |
                                       |_________________________________|

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





   __________________           _____
  | 128-Port        1|____NE___|Modem|------ - ,
  | Adapter         2|         |_____|         |
  |_______          _|                         |
          ||||||||_|         .-----TEL LINES - '       _____   ________
                             |   _____                |     | |        |
                             '--|Modem|______NF_______|    _|_|_       |
                                |_____|                   |Node1|      |
                                                          |_____|     _|_T_
                                                                     |Node2|
                                                                     |_____|