Browse Prior Art Database

Efficient Data Transmission Protocol of &mu.PD72105 Application System

IP.com Disclosure Number: IPCOM000113254D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Matsunaga, S: AUTHOR

Abstract

Disclosed is a protocol to improve the efficiency of data transmission in a LAN system using &mu.P72105* (&mu.P72105 application system). This protocol enables data transmission of more than 2K bytes at a very high rate and needs no work area.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 62% of the total text.

Efficient Data Transmission Protocol of &mu.PD72105 Application System

      Disclosed is a protocol to improve the efficiency of data
transmission in a LAN system using &mu.P72105* (&mu.P72105
application system).  This protocol enables data transmission of more
than 2K bytes at a very high rate and needs no work area.

      Fig. 1 shows the outline of the application system.  Each node
of this application system consists of two kinds of processes.  One
is the Common Adapter Code (CAC) and the other is a Device Processor
(DP).  Only one CAC exists in each node and controls the &mu.P72105
to communicate with another node.  Several DPs exist in one node and
they can communicate with the DP in another node through the CAC.

      When the DP requests the CAC to send the data of more than 2K
bytes to the DP in another node, the CAC sends the data according to
the protocol described in this article.  This protocol rests on the
concept that DP can communicate with the DP in another node freely.

      The CAC uses 3 sockets of &mu.P72105.  Socket 80H or 90H is
used as data socket and other two sockets are used as semaphore
socket and control socket, respectively.  The following packet types
are defined to allow CAC-CAC communications and the flow diagram is
shown in Fig. 2.

1.  REQUEST PACKET - Sender sends this packet to the semaphore socket
of receiver:

      This packet notifies the receiver that the sender wants to send
the data of more than 2K...