PC Ext: Memory Requirements for the External Mail Program (78803)

SUMMARY

You can use the following formula to estimate how much memory the Microsoft Mail for PC Networks External Mail program (EXTERNAL.EXE) will require to run without memory problems.

There are two major categories of memory usage for EXTERNAL.EXE:

1. General Memory Requirements

         Memory    Needed For
         ------    ----------------------
   
         200K      EXTERNAL.EXE
         64K       message storage
         16K       modem traffic
         ------
   
         280K      general memory required

2. External Postoffice Servicing Requirements (Servicing memory is required for mail dispatching, and so on.) The servicing memory requirements will vary directly with the number of postoffices that External is addressing. The servicing memory requirements need to be calculated for each postoffice separately because the number of external networks will be different. The following figures can be used to determine each postoffice's servicing requirements:

         Number of Local Users           Multiplied (*) by 37 bytes
         Number of dispatch networks     Multiplied (*) by 38 bytes
         Number of dispatch postoffices  Multiplied (*) by 90 bytes
         Number of external networks     Multiplied (*) by 45 bytes
         Number of external postoffices  Multiplied (*) by 115 bytes
         Number of gateways              Multiplied (*) by 83 bytes
         Number of gateway nodes/DGNs    Multiplied (*) by 83 bytes
   						

   For example:
   
   The following example will show the EXTERNAL.EXE memory requirements dispatching between two postoffices, each with 100 users defined. No gateways are involved.
   
   General External Memory Requirements

                   200K  base EXTERNAL.EXE
                    64K  for message storage
                    16K  for modem traffic
                   ----
                   280K  General Memory Requirements
   						

   Servicing Requirements for two postoffices

           Postoffice 1
           ------------
   
                   100 local users           *  37   =  3700 bytes
           +         1 dispatch networks     *  38   =    38 bytes
           +         1 dispatch postoffice   *  90   =    90 bytes
           +         2 external networks     *  45   =    90 bytes
           +        10 external postoffices  * 115   =  1150 bytes
           +         0 gateways              *  83   =     0 bytes
           +         0 gateway nodes/DGNs    *  83   =     0 bytes
                                                        ----
                                                        5068 bytes
   
           Postoffice 2
           ------------
   
                   100 local users           *  37   =  3700 bytes
           +         1 dispatch networks     *  38   =    38 bytes
           +         1 dispatch postoffice   *  90   =    90 bytes
           +         1 external networks     *  45   =    45 bytes
           +         1 external postoffices  * 115   =   115 bytes
           +         0 gateways              *  83   =     0 bytes
           +         0 gateway nodes/DGNs    *  83   =     0 bytes
                                              ----
                                           +  3988 bytes
   
           Total External PO Requirements            =  9056 bytes
   
           Total External Requirements          =    289,056 bytes