Browse Prior Art Database

Customer Selectable Ethernet Implementation

IP.com Disclosure Number: IPCOM000108549D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Allen, JW: AUTHOR

Abstract

Previously, Ethernet was added to a system by integrating the Ethernet subsystem onto the system planar, or adding a feature card to a standard feature slot. In both cases the Ethernet media is fixed for that design. External hardware must be added to change media type (10base2, 10base5, or 10baseT). In the feature card implementation the Ethernet adapter also occupies a slot that could be used for other functions.

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

Customer Selectable Ethernet Implementation

       Previously, Ethernet was added to a system by integrating
the Ethernet subsystem onto the system planar, or adding a feature
card to a standard feature slot.  In both cases the Ethernet media is
fixed for that design. External hardware must be added to change
media type (10base2, 10base5, or 10baseT).  In the feature card
implementation the Ethernet adapter also occupies a slot that could
be used for other functions.

      The following method of implementation eliminates these
deficiencies and provides direct attachment of Ethernet to the
system.  The system interface and control logic is integrated onto
the planar while the serial subsystem resides on a riser that plugs
into the planar.  The ethernet cable is attached to the riser through
the back of the machine.
New Method of Ethernet Implementation
      Planar Interface/Control Logic:
      The Planar Interface/Control Logic is composed of 3 parts:
1.  Buffer logic that redrives the signals from or to the rest of the
logic.
2.  An ASIC chip provides control and data signal translation between
the Micro Channel* and the Ethernet controller, Micro Channel Bus
Master interface, and local RAM for storage of Ethernet Controller
address descriptors and commands.
3.  Ethernet Controller provides Ethernet protocol, FIFO memory, and
DMA control.
      Serial Subsystem Riser Cards
      One riser card provides the interface from the Ethernet
controller to 10base5 and 10base2 ('Thick' and 'Thin").
      The other riser card provid...