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. 19, 2002
Filed:
Jun. 04, 1998
Hisashi Shimade, Tokyo, JP;
Masaki Komatsu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a communication network, a source frame relay unit responds to a signaling message from a source terminal by determining whether a communication link has a bandwidth sufficient to transmit a sound signal at a predetermined speed in a frame relay format, and forwards the message toward a destination frame relay unit to establish a connection if the link has a bandwidth sufficient to transmit the sound signal, or returns a busy tone otherwise. Responsive to a preamble tone signal from a destination terminal, the destination frame relay unit determines whether the link has a remaining bandwidth that can support the difference between the predetermined speed of the sound signal and a speed requested by the preamble tone signal to transmit facsimile signals in the frame-relay format. If so, the source and destination terminals are allowed to exchange facsimile signals at the requested speed. Otherwise, the terminals are controlled to exchange facsimile signals at a speed lower than the requested speed.