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:
Mar. 23, 2004
Filed:
Jun. 18, 1999
Kevin W. Schneider, Huntsville, AL (US);
Don A. Waring, Madison, AL (US);
Adtran, Inc., Huntsville, AL (US);
Abstract
To reduce the possibility of a data-induced latching loopback, a digital data services device integrates one or more digital control code-based filtering routines into a test code sequence-based latching loopback scheme. The filtering routines include a 'garbage' byte detection routine, a 'protected loopback' routine, and a ‘preamble’ routine. The ‘garbage’ byte detection routine is an intra-loopback establishment filtering routine that limits the type of customer data that may be received between sequences of repeated control bytes of a valid latching loopback sequence. The ‘protected loopback’ routine is a flag byte-based filtering routine for frame relay data, which controllably disables latching loopback for a prescribed period of time, whenever a predetermined character associated with frame relay customer data is detected. The ‘preamble’ routine is a repeated code based-mechanism that allows the timeout invoked in the frame relay protected loopback routine to be controllably terminated, so that latching loopback may be immediately re-enabled.