Repeaters for secure local area networks
Patent 5161192 Issued on November 3, 1992. Estimated Expiration Date: 
November 7, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 7, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLocal orderwire facility for fiber optic communication system Processor intercommunication network Local area network system with a multi-computer system coupled thereto and method for controlling the same Data transmission security arrangement for a plurality of data stations sharing access to a communication network Digital communication system with addressable repeaters and devices for fault isolation Patent #: 4939747 InventorsAssigneeApplicationNo. 609791 filed on 11/07/1990US Classes:713/162, Having particular address related cryptography370/392, Processing of address header for routing, per se370/501, Repeater375/212Ring or star configurationExaminersPrimary: Gregory, Bernarr E.International ClassesH04B 003/36H04B 003/58 H04L 025/20 H04L 025/52 Foreign Application Priority Data1989-12-06 GBAbstractA multiport repeater for a local area network installation has (in addition to its conventional functions) means for storing access rules for the items of equipment connected to it. It reads a portion of each frame, which may be all or part of the destination address segment and/or of the source address segment and/or of the control segment of each incoming data frame, or it could be a frame or protocol identifier incorporated in opening bytes of the data segment. It compares the data that it reads with the stored access rules to determine whether the frame is permitted or not. If not, the repeater modifies the frame which it is in the course of re-transmitting, for example by overwriting it with meaningless digits or by encrypting it. It may also report the source address, destination address and reason for deciding to modify the frame to the network controller.Other References
| |
