H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 3/06 (2006.01) H04B 7/212 (2006.01) H04J 3/16 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2180013
A central station (24) of a cable television distribution network (10) transmits TDM frames comprising distribution information and overhead information downstream to customer terminals (26), and determines corresponding upstream TDMA frames by includ- an upstream frame identity in the overhead information of each downstream frame. Each terminal buffers asynchronous information for upstream transmission, and stores an upstream frame identity which it is assigned. On detecting this frame identity in the downstream overhead information, the terminal transmit a buffer queue size in an assigned time slot of the corresponding upstream frame The central station uses the queue sizes from the terminals to allocate time slots in the upstream frames to terminals, by including their terminal addresses in the downstream overhead information, for transmission of the buffered asynchronous information. The central station can also assign time slots to the terminals for transmission of isochronous information.
Une station centrale (24) d'un réseau de répartition de télévision par câble (10) transmet en aval, vers les terminaux usagers (26), des trames MRT comportant des informations de service, et détermine des trames amont AMRT correspondantes en ajoutant un identificateur de trame amont aux informations de service de chaque trame aval. Chaque terminal met en mémoire tampon des informations asynchrones destinées à la transmission amont, et stocke un identificateur de trame amont qui lui est attribué. Lorsqu'il détecte cet identificateur de trame dans les informations de service aval, le terminal transmet une donnée de taille de file d'attente en mémoire tampon, à l'intérieur d'une tranche de temps attribuée de la trame amont correspondante. La station centrale utilise les indications sur les tailles de files d'attente des terminaux pour allouer, aux terminaux, des tranches de temps dans les trames amont, en incluant leurs adresses de terminal dans les informations de service aval, en vue de la transmission des informations asynchrones stockées en mémoire tampon. La station centrale peut aussi attribuer des tranches de temps aux terminaux pour la transmission d'informations isochrones.
Nortel Networks Limited
Northern Telecom Limited
Smith Dallas F.
LandOfFree
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