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:
Aug. 22, 1995
Filed:
Aug. 12, 1991
Applicant:
Inventors:
P Michael Henderson, Largo, FL (US);
Edward A Thoenes, St. Petersburg, FL (US);
Assignee:
AT&T Corp., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
370 84 ; 375222 ; 370 16 ;
Abstract
In a multidrop data communication system operating at a first bit rate using the High-Level Data Link Control (HDLC) protocol, dial restoral of communications with a particular tributary at a second, lower bit rate is accomplished without requiring the system as a whole to back down to that lower bit rate. Specifically, the outgoing data is buffered in the dial restoral modem, which discards the data stored in the buffer upon receipt of the HDLC frame which follows any frame in which the so-called 'poll' bit is set.