The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 1989
Filed:
Apr. 29, 1987
Michael Cooperman, Framingham, MA (US);
Richard W Sieber, Attleboro, MA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
Abstract
In a data transmission system including a central subsystem coupled by transmission lines of different lengths to a plurality of remote subsystems, methods and apparatus for synchronizing responses to messages transmitted by the central subsystem to compensate for different line delays are provided. The messages are transmitted by the central subsystem during the first portion of a frame, while the responses are transmitted by the remote subsystems during a second portion of the frame. In each of the remote subsystems, a compensation delay equal to a maximum line delay associated with the longest of the transmission lines less an actual line delay associated with the transmission line connected to that remote subsystem is determined. The response to the message is then delayed by the compensation delay so that the responses from each remote subsystem arrive at the central subsystem delayed by the maximum time delay. The central subsystem detects the response during a detection interval delayed by the maximum time delay after the end of the message.