Browse Prior Art Database

Low Cost Concentrator using Workstations

IP.com Disclosure Number: IPCOM000111880D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Berger, DF: AUTHOR

Abstract

This article describes a method to build a Local Area Network (LAN) Concentrator from intelligent LAN Adapters which are used in workstations. The individual workstations then may use spare adapter slots for the LAN Concentrator function.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 68% of the total text.

Low Cost Concentrator using Workstations

      This article describes a method to build a Local Area Network
(LAN) Concentrator from intelligent LAN Adapters which are used in
workstations.  The individual workstations then may use spare adapter
slots for the LAN Concentrator function.

      An intelligent LAN adapter utilized in a workstation can be
simply modified to provide the function of a LAN Concentrator.  This
simple modification to the adapter's hardware, along with some
additional software changes, will allow the adapter to function as a
concentrator in a network.

      The Figure illustrates a LAN Adapter modified to interface with
the additional PHYSICAL (PHY) interfaces.  Network data input is
routed to the additional PHY's layer, extending the network to
stations which (may not)/(can not) connect to the primary network
ring.  The data passes from one station to the next in the chain,
then finally to the Media Access Controller (MAC) interface within
the station and then to the ring output.

      The concentrator function is then provided by the additional
Master Port card(s) installed in the spare feature card slots of the
workstation.

      The concentrator control is provided by the Local Processor
which already is required on an intelligent LAN adapter.  The
software changes required are for ring initialization, and do not
effect the primary function of passing data into and out of the
workstation.  The overhead which occurred ...