Arris Enterprises LLC

Pingbo Liu

Feng Li

Xing Feng

Jinji Guo

A network device for providing single-carrier quadrature amplitude modulation (SC-QAM) downstream channel fast pre-scanning. An orthogonal frequency-division multiplexing (OFDM) downstream (DS) channel scan in a foreground process and a single-carrier quadrature amplitude modulation (SC-QAM) DS channel scan in a background process are simultaneously performed. When a first OFDM downstream channel is locked onto, OFDM downstream channel is paused while scanning for SC-QAM downstream channels continues. SC-QAM DS channels identified in the background process are stored in a table. Based on a scan of all OFDM channels and failure to lock onto any OFDM DS channels, the SC-QAM DS channel scan in the background process is stopped and a normal SC-QAM DS channel scan is started. SC-QAM DS channels in the table are scanned first to provide fast pre-scanning. A modem becomes operational with a qualified SC-QAM DS channel obtained from the table.

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Guangdong, China

Pingbo Liu