Monday, February 28, 2011

Motorola and Cox Test 356 Mbps DOCSIS 3.0 RX48 Return Path

–Motorola Mobility and Cox Communications announced a record 356 Mbps for return path data transmission. The test used an ultra low noise, high performance Motorola DOCSIS 3.0 RX48 return path receiver module operating within a Motorola BSR 64000 CMTS Edge Router. The record of 356 Mbps for a 5-85 MHz return path was set by transmitting across twelve return path channels of which six channels employed 256QAM modulation.

Typical HFC networks today have two or three upstream channels delivering an aggregate of 40-70 Mbps.

In addition to establishing the world record at 5-85 MHz, a maximum transmission rate of 141 Mbps was also achieved over a 5-42 MHz return path using six return path channels. Three of these channels were able to operate using 256 QAM modulation, as opposed to 64 QAM maximum in use today, which is also believed to be a record. For the first time, cable operators can use the 5-42 return path to provide 100 Mbps dedicated to business customers and simultaneously provide residential customers with the return path bandwidth necessary to meet their growing needs.

"The RX48 and these tests demonstrate that Cox's HFC networks are much more future proof than many have believed," Jay Rolls, senior vice president of technology, Cox Communications. "We also increasingly need to be able to segment our business and residential customers, visibility into which is provided by the 5-85 MHz return spectrum utilizing 256QAM. Our networks have the capability to support much higher data speeds than today without the need to replace any of the amplifiers, taps or cables."

Motorola said its RX48 provides between 33% and 50% higher data rates possible in the return path than previously possible based on its low noise receiver and hardware based DOCSIS 3.0 channel bonding capabilities. For example, with a 5-42 MHz return path connected to the RX48, it will be possible for the first time for cable operators to support 100 Mbps dedicated for business services in only three bonded return path channels instead of four, leaving three return path channels available for residential data services, all supported using only a single RX48 port in the CMTS.