Browse Prior Art Database

LAN Local Gateway

IP.com Disclosure Number: IPCOM000107303D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 3 page(s) / 79K

Publishing Venue

IBM

Related People

Maher, JH: AUTHOR [+2]

Abstract

This article describes a mechanism for providing Host Application support for Workstation LAN Devices using a Token-Ring adapter, LAN Wiring and Gateway functions.

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

LAN Local Gateway

       This article describes a mechanism for providing Host
Application support for Workstation LAN Devices using a Token-Ring
adapter, LAN Wiring and Gateway functions.

      This gives Host support for Coax Workstation LAN devices not
otherwise available.

      In particular, this article describes how the LAN support makes
use of the 802.2 Logical Link Control (LLC) data management provided
by the Token-Ring Adapter to transfer data to a Coax Workstation LAN
Device.

      This eliminates the need to add the LLC functions of the Token
Ring adapter in the processing unit.  There is an additional
performance benefit of off-loading the LLC data management functions
from the main processor to the microprocessor contained on the I/O
adapter.

      The Gateway support expects to transfer data using the
Token-Ring I/O adapter, where the adapter provides the LLC data
management function.  In order to access Host applications through
the Gateway, LAN devices require the same LLC data management.

      This invention allows data from Coax Workstation LAN devices to
use the LLC data management function in the local Token-Ring adapter
by utilizing the Bridge data interface of the adapter to route the
data to the LLC function in the same adapter.  No new hardware or
microcode is required to make these connections.  A block diagram of
this configuration is shown in Fig. 1.

      The Coax LAN devices are configured as Token-Ring-attached
Downstream Physical Units.

      Following is a description of data flow from the Host
application to the Coax LAN device and from the Coax LAN device to
the Hos...