Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1995-03-13
1997-10-21
Nguyen, Chau
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370434, 370425, H04L 1216, H04L 1244
Patent
active
056803974
ABSTRACT:
A multi-port LAN switch is provided that enables attached network devices to both communicate directly and to insert into a token-ring network through an attached concentrator. Each port of the multi-port LAN switch has a first transformer, a second transformer, and a switching system. The first transformer has a first winding connected to a first connection of the port. The second transformer has a first winding connected to a second connection of the port. The switching system switches to a port mode or an adapter mode as a function of a mode signal transmitted to the port. In the adapter mode, the switching system connects a second winding of the first transformer to a transmitter circuit in the port, and its connects a second winding of the second transformer to a receiver circuit in the port. In the port mode, the switching system connects the second winding of the first transformer to the receiver circuit in the port, and it connects the second winding of the second transformer to the transmitter circuit in the port. Each port of the multi-port LAN switch further includes a DC voltage source that is switchably connected to the first connection of the port through a first switch. Each port further includes a second switch that connects the second connection of the port to a DC return-path in a first position, and connects the second connection to the first connection when in a second position.
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IBM Technical Disclosure Bulletin, vol. 37, No. 40A, Apr. 1994.
"Token-Ring 16/4 Adapter with Full-Duplex Switching Operation Mode" XP 2008692.
Bevill, Jr. Beymer
Christensen Kenneth J.
Dagher Jerry
Noel Francis E.
Rehquate Rudolf E.
Cockburn Joscelyn G.
International Business Machines - Corporation
Nguyen Chau
LandOfFree
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