A data communication system includes a head-end modem, which is adapted to transmit downstream data signals over a communication medium in a first frequency band and to receive upstream data signals over the communication medium in a second frequency band, each of the first and second frequency bands...http://www.google.fr/patents/US20040032902?utm_source=gb-gplus-shareBrevet US20040032902 - Modem channel sharing based on frequency division
Numéro de demande: 10/219,881 Numéro de publication: US 2004/0032902 A1 Date de dépôt: 14 août 2002 Brevet délivré: US7151794 ( Date de délivrance 19 déc. 2006)
