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:
Jul. 02, 1996
Filed:
May. 02, 1994
Allen Thor, Livingston, NJ (US);
Advanced Micro Devices, Inc., Parsippany, NY (US);
Abstract
Exchangeable LID modules are provided to enable the frame relay switching system to be interfaced to a specific data terminal, for example, synchronous, asynchronous terminals or T1 line, by performing on the receive side the physical translation of information on the input lines to clock signal CLK and HDLC framed data. On the transmit side, the HDLC framed data and clock signal CLK are translated into the data appropriate for a data terminal. The type of the translation is specific to the line to be interfaced with. To support a synchronous data terminal, a synchronous receiver is provided that extracts valid data patterns from a synchronous data stream. The data patterns are replaced with the data stream of appropriate levels when data are transmitted. When data are received from a T1 line, the LID splits the received data stream into user data and signalling data. The signalling data are buffered to form a signalling frame sent to a signalling frame relay packet management device (FRYPAM) separate from a user data FRYPAM that receives user data frames. To support an asynchronous data terminal, a microprocessor is provided to handle PAD and LAPB operations for transforming asynchronous data into X.25 format.