Method for automatically adapting and configurating the...

H - Electricity – 04 – L

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H04L 29/02 (2006.01) H04L 12/52 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2134015

Method for automatically adapting and configuring the speed of a terminal adapter to the rate 56Kbps or 64Kbps which is used by a calling adapter. After the sending in the called terminal adapter of the CONNECT message which is sent to the ISDN NETWORK in accordance with CCITT Q.931 Recommendations, the called TA is initialized to a rate of 64 Kbps and then continuously transmits an alignment pattern ALL_ONES while starting a first timing process (T1). This first timing process will cause the called TA to switch to a 56Kbps speed if the 64 Kbps validation process does not succeed. The method then involves the step of checking the reception of a ALL_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_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_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 64Kbps validation process involves the checking of the continuous receiving of said ALL_ZEROS pattern during said first period (T1) as long as the ALL_ONES pattern is not yet received, and at the end of said first period (T1) validating the 64Kbps rate.

Méthode pour adapter et configurer automatiquement la vitesse d'un adaptateur de terminal (TA) à un débit de 56 Kbps ou 64 Kbps, utilisé par un adaptateur d'appel. Après l'envoi, dans l'adaptateur du terminal appelé, du message CONNECT qui est envoyé au RESEAU RNIS conformément aux Recommandations CCITT Q.931, le TA appelé est initialisé à un débit de 64 Kbps, puis il transmet en continu un profil d'alignement ALL ONES en commençant un premier processus de synchronisation (T1). Le premier processus de synchronisation fera passer le TA appelé à une vitesse de 56 Kbps si le processus de validation de 64 Kbps ne réussit pas. L'étape suivante consiste à vérifier la réception d'un profil ALL_ZEROS provenant dudit adaptateur d'appel (20) avant la fin de ladite première période déterminée (T1). Dans ce cas, un processus de validation de 64 Kbps est exécuté. Ce processus comprend une vérification visant à déterminer si un profil ALL_ONES est reçu à l'intérieur d'une deuxième période (T2), auquel cas le débit 64 Kbps sera validé. Par contre, si le profil ALL ZEROS n'est pas reçu à la fin de la première période (T1), il y a lancement d'un processus de validation de débit 56 Kbps basé sur la détection d'un profil dit de 56 Kbps dans le train de données. Le profil de 56 Kbps est défini comme un certain nombre de n multiplets dont le premier bit est à un. De plus, le processus de validation de 64 Kbps comprend la vérification de la réception continue dudit profil ALL ZEROS pendant ladite première période (T1) tant que le profil ALL ONES n'est pas reçu, et, à la fin de ladite première période (T1), la validation du débit de 64 Kbps.

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