NATURAL MICROSYSTEMS CORPORATION

DTI-48 REV. 2.4

Card Type                T1 DSU
Chip Set                 TI TMS320C51
Processor Type           80376 (exact location is unidentified)
Processor Speed          Unidentified
I/O options              MVIP bus
Maximum Data Rate        1.544Mbps x 2, 64Kbps x 48
Data Bus                 16-bit ISA
Data Modulation Protocol B8ZS

[Image]

                                CONNECTIONS

          Function             Label           Function             Label

  Line 1 out                    J1     Audio handset                 J3

  Line 2 out                    J2     MVIP bus                      J4

                        USER CONFIGURABLE SETTINGS

                    Setting                        Label       Position

  »   Factory configured - do not alter            SW2/8         Off

  »   Factory configured - do not alter            SW3/8         Off

  »   Factory configured - do not alter            P1/E          Open

  »   Factory configured - do not alter            P1/F          Open

  »   Factory configured - do not alter             P3           Open

  »   Factory configured - do not alter             P5           Open

                             BASE I/O ADDRESS

      Setting           S4/1          S4/2         S4/3          S4/4

          200h           On            On           On            Off

  »       300h           On            On           On            On

         2200h           On            On           Off           Off

         2300h           On            On           Off           On

         4200h           On           Off           On            Off

         4300h           On           Off           On            On

         6200h           On           Off           Off           Off

         6300h           On           Off           Off           On

         8200h          Off            On           On            Off

         8300h          Off            On           On            On

         A200h          Off            On           Off           Off

         A300h          Off            On           Off           On

         C200h          Off           Off           On            Off

         C300h          Off           Off           On            On

         E200h          Off           Off           Off           Off

         E300h          Off           Off           Off           On

                           CABLE LENGTH - LINE 1

   Setting     S2/1     S2/2     S2/3    S2/4     S2/5     S2/6     S2/7

   0’-150’      On      Off      Off      Off      Off      Off     Off

  150’-450’    Off       On      Off      On       Off      On      Off

  450’-655’    Off      Off       On      Off      On       Off      On

                           CABLE LENGTH - LINE 2

   Setting     S3/1     S3/2     S3/3    S3/4     S3/5     S3/6     S3/7

   0’-150’      On      Off      Off      Off      Off      Off     Off

  150’-450’    Off       On      Off      On       Off      On      Off

  450’-655’    Off      Off       On      Off      On       Off      On

                           T1 DIRECTION - LINE 1

                Setting                                 P8

  »                Normal                    Pins 1 & 2, 3 & 4 closed

                  Reversed                   Pins 1 & 3, 2 & 4 closed

                           T1 DIRECTION - LINE 2

                Setting                                 P10

  »                Normal                    Pins 1 & 2, 3 & 4 closed

                  Reversed                   Pins 1 & 3, 2 & 4 closed

                           MVIP BUS TERMINATION

       Setting            P1/A         P1/B         P1/C         P1/D

  »     Terminated       Closed       Closed       Closed       Closed

      Not terminated      Open         Open         Open         Open