Transmission equipment for an interexchange connection

H - Electricity – 04 – B

Patent

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Details

H04B 14/04 (2006.01) H04J 3/12 (2006.01) H04Q 7/20 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2215059

The invention relates to a method and transmission equipment for a connection between telecommunication network elements, such as exchanges or base station controllers. At both ends of the connection there is a transmission equipment (TRACU1, 2) connected to a number of PCM transmission channels from the exchange. A lower-capacity interconnecting PCM link in which bits in the PCM samples form subchannels for transmitting lower-rate vocoded speech or data is provided between the transmission equipments. If a PCM coded speech signal in which there is a lower-rate subchannel in one or more least significant bits of the PCM samples is received from the exchange, the content of this subchannel is multiplexed into one of the subchannels in the interconnecting PCM link. If a pure PCM coded speech signal is received from the exchange, it is encoded into a lower- rate vocoded speach signal, and the vocoded speech signal is multiplexed into one of the subchannels of the interconnecting PCM link. At the other end of the connection, the transmission equipment decodes the vocoded speech signal into PCM samples and the undecoded content of the subchannel is inserted into the least significant bits of the PCM samples.

Procédé et équipement de transmission pour connexion entre éléments d'un réseau de télécommunication tels que des centraux ou des contrôleurs de stations de base. Aux deux extrémités de la connexion un équipement de transmission (TRACU1, 2) est relié à un certain nombre de voies de transmission en modulation par impulsions codées (PCM) à partir du central. Une liaison PCM d'interconnexion de moindre capacité, dans laquelle les bits des échantillons PCM constituent des canaux partiels de transmission à plus faible vitesse de parole sous forme codée ou de données, est assurée entre les équipements de transmission. Si un signal de parole codé en PCM dans lequel il existe un canal partiel plus lent dans l'un des bits les moins significatifs des échantillons PCM est reçu du central, le contenu de ce canal partiel est multiplexé sur l'un des canaux partiels de la liaison d'interconnexion PCM. Si un signal de parole sous forme codée purement PCM est reçu du central, il est codé en un signal de parole codé à plus faible vitesse et ce signal de parole codé est multiplexé sur l'un des canaux partiels de la liaison PCM d'interconnexion. A l'autre extrémité de la connexion, l'équipement de transmission décode le signal de parole codé en échantillons PCM et le contenu décodé du canal partiel est inséré dans les bits les moins significatifs des échantillons PCM.

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