Browse Prior Art Database

Message Chaining Communication Adapter

IP.com Disclosure Number: IPCOM000108268D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 79K

Publishing Venue

IBM

Related People

Ashton, J: AUTHOR [+10]

Abstract

This article describes a method for transferring data between a communications controller and a packet switch network. The communications controller includes a communication adapter (Com Adapter) which forms a data interface to a data link into a packet switch network. The communications controller also includes a central control unit (CCU) for controlling the operation of the Com Adapter. The data in the CCU to be transferred includes one or more individual messages that are appropriately delineated. In response to a request from the CCU, the Com Adapter transfers data from a chained list of buffers in the communication controller CCU until all messages contained in the chained list have been transferred.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Message Chaining Communication Adapter

       This article describes a method for transferring data
between a communications controller and a packet switch network.  The
communications controller includes a communication adapter (Com
Adapter) which forms a data interface to a data link into a packet
switch network.  The communications controller also includes a
central control unit (CCU) for controlling the operation of the Com
Adapter. The data in the CCU to be transferred includes one or more
individual messages that are appropriately delineated.  In response
to a request from the CCU, the Com Adapter transfers data from a
chained list of buffers in the communication controller CCU until all
messages contained in the chained list have been transferred.  After
all of the messages in the present transmission have been
transferred, the Com Adapter interrupts the CCU to signal completion.

      The novelty consists of the chaining of different messages
together in a way that is very efficient for use with packet
networks.  For frame relay, the messages for each single end station
are kept in separate queues within the communication controller.
These queues are serviced by the controller in a round-robin scheme,
or by a priority scheme.  Therefore, a queue, when serviced, may
contain more than one message.  Each message in the queue will
contain a chain pointer to the next message in the queue and this
chain of messages will be passed as a single entity to the...