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:
May. 21, 1996
Filed:
Jan. 03, 1995
Pascal Chauffour, Saint Laurent Du Var, FR;
Michel Froissart, Cagnes Sur Mer, FR;
Dominique Vinot, La Gaude, FR;
International Business machines Corporation, Armonk, NY (US);
Abstract
Method for automatically adapting and configuring the speed of a terminal adapter (30) to the rate 56 Kbps or 64 Kbps which is used by a calling adapter (20). After sending the CONNECT message via the ISDN NETWORK to the calling terminal adapter (20) in accordance with CCITT Q.931 Recommendations, the called TA (30) is initialized to a rate of 64 Kbps and then continuously transmits (204) an alignment pattern ALL.sub.-- ONES while starting a first timing process (T1). This first timing process will cause the called TA to switch to a 56 Kbps speed if the 64 Kbps validation process does not succeed. The method then involves the step of checking (206) the reception of a ALL.sub.-- ZEROS pattern coming from said calling adapter (20) before the end of said first predetermined period (T1). If this case, a 64 Kbps validation process will be performed which comprises the checking whether a ALL.sub.-- ONES pattern is received within a second period (T2), in which case the 64 Kbps rate configuration will be validated. On the contrary, if the ALL.sub.-- ZEROS pattern is not received at the end of the first period (T1), a 56 Kbps rate validation process is initiated which is based on the detection of a so-called 56 Kbps pattern within the data flow. The 56 Kbps pattern is defined as being a number of n bytes with the first bit of every byte being set to a one. Additionally, the 64 Kbps validation process involves the checking (210) of the continuous receiving of said ALL.sub.-- ZEROS pattern during said first period (T1) as long as the ALL.sub.-- ONES pattern is not yet received, and at the end of said first period (T1) validating (209, 213) the 64 Kbps rate.