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 Title: |
US5680397:
Multi-port LAN switch for a token-ring network
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Christensen, Kenneth J.; Apex, NC
Noel, Francis E.; Durham, NC
Rehquate, Rudolf E.; Raleigh, NC
Stammely, Thomas; Cary, NC
Dagher, Jerry; Raleigh, NC
Bevill, Jr., Beymer; Fuquay-Varina, NC
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| Assignee: |
International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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| Published / Filed: |
1997-10-21
/ 1995-03-13
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| Application Number: |
US1995000402740
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| IPC Code: |
Advanced:
H04L 12/42;
H04L 12/44;
Core:
more...
IPC-7:
H04L 12/16;
H04L 12/44;
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| ECLA Code: |
H04L12/42; H04L12/44;
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| U.S. Class: |
Current:
370/421;
370/425;
370/434;
Original:
370/421;
370/434;
370/425;
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| Field of Search: |
370/225,228,275,278,258,254,294,296,323,257,421,537,540,434,420,425,424,222,452
340/825.05
395/200.21
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| Priority Number: |
| 1995-03-13 |
US1995000402740 |
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| 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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| Attorney, Agent or Firm: |
Cockburn, Joscelyn G. ;
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| Primary / Asst. Examiners: |
Nguyen, Chau;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 16 known family members
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First Claim:
Show all 19 claims |
What is claimed is:
1. A data transfer unit for a network, each port of the data transfer unit having a first port connection, a second port connection, a transmitter circuit and a receiver circuit, each port of the data transfer unit comprising:
- a first transformer having a first winding connected to the first port connection, and a second winding;
- a second transformer having a first winding connected to the second port connection, and a second winding;
- a switching system that switches the port to a first mode or a second mode as a function of a mode signal for that port, wherein the switching system in the first mode connects the second winding of the first transformer to the transmitter circuit and the second winding of the second transformer to the receiver circuit, and wherein the switching system in the second mode connects the second winding of the first transformer to the receiver circuit and the second winding of the second transformer to the transmitter circuit.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 20 U.S. patent(s) that reference this one
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