modem(5)                         DG/UX R4.11                        modem(5)


NAME
       modem - overview of modems on the DG/UX system

DESCRIPTION
       The DG/UX system supports asynchronous and synchronous modems.  You
       can use modems with AViiON servers and workstations.

       Several options exist for modem usage.  You can connect a terminal to
       an AViiON computer via modem.  You can run various software on a
       modem.  The following figure shows the layering:

       +-------------------------------------------------------------------+
       |RJE|3270|FTAM|X.400|X.500|VT|PAD|     UUCP      |TCP/IP|login|other|
       |--------|-------------------|-------------------|------|-----------|
       |  SNA   |         OSI/P     |  XXX | TCP/IP |   | SLIP |           |
       |        |-----------------------------------|   |------|           |
       |        |               X.25                |                      |
       |--------------------------------------------|                      |
       |          synchronous modem                 |  asynchronous modem  |
       +-------------------------------------------------------------------+

       The top two levels in the figure above are as follows:

       RJE     IBM Remote Job Entry facility
       3270    IBM 3270 terminal emulator
       FTAM    File Transfer, Access, and Management
       X.400   A message transfer agent for an X.400 network
       X.500   Directory services for Open System Interconnect (OSI)
               software
       VT      Virtual Terminal
       PAD     Packet Assembler Disassembler
       UUCP    A collection of communications programs including uucp(1)
       TCP/IP  Transmission Control Protocol/Internet Protocol
       login   Logging in at an asynchronous terminal
       other   Unsupported software such as kermit, available on the
               "Contributed Software for AViiON Systems" tape
       SNA     IBM's System Network Architecture
       OSI/P   Open System Interconnect/Platform for AViiON Systems
       XXX     X.3, X.28, and X.29 protocols
       SLIP    Serial Line Interface Protocol

SEE ALSO
       slipd(1C), uucp(5).


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