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DVB return channel for cable (DVB-RCC)

DVB-RCC(DVB Return Channel for Cable) is an ETSI standard( ETS 300800) described by the International Telecommunication Union( ITU) as an annex toDOCSIS in J112. DVB-RCC was developed by the EuroModem consortium with the involvement of DAVIC as a counterpart to the American DOCSIS and represents the current European standard.

This DVB-RCC specification uses DVB-C for transmission and includes in-band and out-of-band transmission, with the former used for MAC data transmission for terminal control and the out-of-band transmission providing an additional data channel. Data transmission is in ATM cell format, and the bandwidth takes into account the 7 MHz and 8 MHz channel widths commonly used in broadband cable networks in Europe. Depending on the selected channel width, the transmission rates in the upstream range from 256 kbit/s to 3.088 Mbit/s, and optionally even to 6.176 Mbit/s. Differential Quaternary PhaseShift Keying( DQPSK) is used as modulation in the upstream. In the downstream, transmission rates of 38 Mbit/s are achieved with QAM 64, and even 52 Mbit/s with QAM 256. The out-of-band channel operates at 1.544 Mbit/s and 3.088 Mbit/s respectively.

Comparison of EuroDOCSIS and DVB-RCC specifications

Comparison of EuroDOCSIS and DVB-RCC specifications

The frequency range is between 5 MHz and 65 MHz in the upstream and between 110 MHz and 862 MHz in the downstream. Subsequent development included optional encryption, Simple Network Management Protocol( SNMP) for network management, and enhanced headend features.

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