Subject: Digital 90 Series Standalone Power Supplies.      REV. 02

    Dual voltage 
    ------------

    A new power supply is being introduced to replace the H7827-AA and
    H7827-BA power supplies  which  are  used when various "90 series"
    Hub products are installed  "stand  alone".  The new power supply,
    model H7867-AA, Digital Part Number  30-41713-01, may be used as a
    UNIVERSAL  replacement  for  BOTH variations of  the  H7827  power
    supply.   The H7827-AA and H7827-BA are  NOT  interchangeable  and
    will  only  function  properly when used in conjunction  with  the
    options listed below. 


  Part Number  DC Output Specifications       AC Input
  -----------  ------------------------       --------             
  H7827-AA     +5.1V @1.5A, +12.1V @.86A*     100-240VAC Removable Power Cord

  H7827-BA     +5.1V @2.5A, +12.1V @0.88A     100-240VAC Removable Power Cord

  3041713-01   +5.1V @4.0A, +12.1V @1.0A       90-265VAC Removable Power Cord

    *Note:  H7827-AA requires a min load of .003A  on 12.1V for proper
            power regulation of both voltages.


    o H7867-AA is a UNIVERSAL replacement and MAY be used  with all of
      the following options.

    o H7827-BA or H7867-AA MUST        o H7827-AA can be be used ONLY
      be used with these options:        with the following options:

        DEFMI        DEWBR                 DEFAR       DEWGB 
        DETMI        DEWB1                 DENMA       DEWGF 
        DERMN        DEWB2
        DTRMN

      Pinouts for H7827-AA/BA/H7867-AA power supply. 

                     Pin                  Output
                     ---------------------------------
                      1                  +5  Volts
                      2                  +12 Volts
                      3                  +5  Volts
                      4                  +12 Volts
                      5                  Return
                      6                  Return
                      7                  Return
                     Shield              Tied to Chassis ground         
                     -------------------------------------

                               5  6  7
                               o  o  o
                            3 o  [x]  o 4
                                o   o
                                1   2

                             NOT TO SCALE
       Connector  physical  pinout looking into connector on end of DC
       cable.


    Single Voltage       
    --------------

    The single  voltage supplies have two variations.  The H7082-AA is
    intended for 120V  use  only  and  doesn't  require  a power cord.
    Instead, it plugs directly  into  a  standard US Style three prong
    electrical  outlet.    The H7082-AB  is  a  universal  supply  and
    operates at 100-240VAC 50/60Hz, using a  removable power cord with
    an IEC style connector. 


  Part Number  DC Output Specifications       AC Input
  -----------  ------------------------       --------             
  H7082-AA     +5.1V @1.8A                    100-120VAC Only No Power Cord

  H7082-AB     +5.1V @1.8A                    100-240VAC Removeable Power Cord

   Used on:

     DSRVD          DEFMR 
     DSRVG          DEIAP 
     DSRVE          DEWAR 
     DSRVH          DEWIR 
     DECMR          DEWA2 
     DETMR          DSRZF 
          
          
   Pinouts for H7082 power supply

                   Pin                  Output
                -------------------------------------
                    1                   +5  Volts
                    2                   Return
                    3                   +5  Volts
                    4                   Return
                    5                   +5  Volts
                    6                   N/C
                    7                   Return
                   Shield               Tied to chassis ground
                -------------------------------------


                               5  6  7
                               o  o  o
                            3 o  [x]  o 4
                                o   o
                                1   2

                             NOT TO SCALE
       Connector  physical  pinout looking into connector on end of DC
       cable.

       CAUTION:  Do not attempt to use  any of the H7827 or H7867 Dual
                 Voltage supplies  in  conjunction  with  5  Volt only
                 devices.   Although all  supplies  utilize  the  same
                 "DIN" style connector, they are wired differently.