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. 25, 2003
Filed:
Sep. 28, 1998
Methods and apparatus for handling maintenance messages in extended superframe t1 telephone circuits
William G. Bartholomay, Orange, CT (US);
Santanu Bhattacharya, Delhi, IN;
Pushkal Yadav, New Delhi, IN;
Balaraj Vishnu Varthanan, Tamil Nadu, IN;
Transwitch Corporation, Shelton, CT (US);
Abstract
An apparatus for handling back-to-back maintenance messages in extended superframe t telephone circuits includes a FIFO, a byte counter, and a message length register. According toga method of the invention, when messages are placed in the. FIFO, the byte counter counts the message length and places the message length in the message length register. A host controller is required to read the message length register in the time interval following complete receipt of a first message before complete receipt of a second message, but is only required to read the contents of the FIFO before it overflows. According to a presently preferred embodiment of the apparatus, a second register is provided for indicating the current depth of the FIFO. The second register sends an interrupt to the host controller when the contents of the FIFO exceed a threshold.