Browse Prior Art Database

Fiber Backbone Bridge Connection Lobe Attachment Module for IBM 8230 Network Controlled Access Unit

IP.com Disclosure Number: IPCOM000108700D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 86K

Publishing Venue

IBM

Related People

Arlington, DL: AUTHOR [+2]

Abstract

A design is disclosed for a Backbone Bridge Lobe Attachment Module (BBLAM) for attaching bridged Token Ring LAN segments to an optical fiber or copper backbone using the IBM 8230 Controlled Access Unit (CAU). Fig. 1 illustrates an IBM bridge connecting an office ring to a backbone ring using a BBLAM.

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Fiber Backbone Bridge Connection Lobe Attachment Module for IBM 8230 Network Controlled Access Unit

       A design is disclosed for a Backbone Bridge Lobe
Attachment Module (BBLAM) for attaching bridged Token Ring LAN
segments to an optical fiber or copper backbone using the IBM 8230
Controlled Access Unit (CAU).  Fig. 1 illustrates an IBM bridge
connecting an office ring to a backbone ring using a BBLAM.

      A single-port (self-contained) unit attaches via a secure
mechanism to a pair of the Lobe Attachment Module (LAM) cable ports
on the back of the CAU base.  These units can be designed to fit in
a rack (or non-rack) environment. The new BBLAM is a direct
replacement of and may be used interchangeably with the current IBM
8230 LAMs without changes.

      Fig. 2 is a functional block diagram of the BBLAM.  The
functions performed within each of the blocks are as followed:
Workstation Connector    The workstation connector is a cabling
system data connector used here to allow a workstation (e.g., a
bridge device) adapter to be physically connected to the BBLAM.
Insert Request Signal    The insert request signal detection
Detection                 circuitry detects the presence of a direct
current signal on the workstation's transmit lines.  The signal will
be present at all times when the workstation's adapter is in
itialized and desires to be an active participant in the ring.
Relay                    This blo...