Browse Prior Art Database

Internal Communications for Coexisting Operating Systems

IP.com Disclosure Number: IPCOM000116365D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Dahl, SA: AUTHOR [+3]

Abstract

When multiple, different operating systems coexist on a single physical system, a mechanism is needed to allow the applications running on these operating systems to continue to communicate with each other without requiring a physical communications link for each operating system. Internal communications provides this connectivity. In addition, since it replaces the physical link, higher layer protocols are fully supported over the Internal Communications link; any networking functions the higher level protocols may provide are supported.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Internal Communications for Coexisting Operating Systems

      When multiple, different operating systems coexist on a single
physical system, a mechanism is needed to allow the applications
running on these operating systems to continue to communicate with
each other without requiring a physical communications link for each
operating system.  Internal communications provides this
connectivity.  In addition, since it replaces the physical link,
higher layer protocols are fully supported over the Internal
Communications link; any networking functions the higher level
protocols may provide are supported.

      The Internal Communications is accomplished by defining a
network within the system.  This network is linked by what is called
an Internal Local Area Network (ILAN).  The ILAN appears as another
data link control to the higher layers in the communications protocol
stack.

      The concept of the Internal LAN is modelled after that of
physical LANs.  In both cases, there are a group of operating systems
that wish to communicate with one or more (and possibly all) of the
other systems on the LAN.  The difference with the Internal LAN is
that there is no physical communications media - the connectivity
between the operating systems occurs in software at low layers within
the physical system.

The following are the significant functions that an Internal LAN
offers:
  o  Full support of higher level protocols.
       Various communications protocols, such as Advanced
        Peer-to-Peer Networking (APPN) and Transmission Control
        Protocol/Internet Protocol (TCP/IP) may operate over the
Internal
        LAN.  There are no limitations imposed on these protocols
when
        running over an Internal LAN.  This differs from other
        alternatives, such as the AS/400s* Intra Communications.
Intra
        communications simply allows program to program connectivity
and
        does not support full networking capabilities found in APPN.
  o  Applications written to the various higher level protocol
      interfaces may operate unchanged.  The fact that th...