August 18, 2014. The Data Over Cable Service Interface Specifications (DOCSIS) 3.1 provide fast data transmission over hybrid fiber coaxial (HFC) networks. To prepare for the planned rollout of the standard, manufacturers of cable headends, cable modems, and network components as well as cable TV network operators can now use the R&S DSA analysis software. Rohde & Schwarz says it is the first supplier that enables users to perform high-quality BER and MER measurements on real-life DOCSIS 3.1 signals.
The R&S DSA software works in combination with the R&S FSW high-end signal and spectrum analyzer, which records the signals using OFDM vector signal analysis software. The R&S FSW provides an analysis bandwidth of 320 MHz. It can therefore be optimally adapted to different signal levels and bandwidths. R&S DSA analyzes the I/Q samples recorded by the R&S FSW and outputs diverse MER values as well as bit and codeword error statistics that comprehensively describe the quality of a DOCSIS 3.1 signal. The R&S DSA software provides a straightforward graphical display of MER vs. subcarrier to allow easy detection of interferers and other negative influences in the transmission channel.
The analysis solution from Rohde & Schwarz is optimized for use in the research and development of cable TV network components. It allows the signal quality of modulators for the DOCSIS 3.1 downstream to be tested when developing cable headends. For cable TV network components, the analysis software makes general performance measurements. The software is also able to measure complete network segments under lab conditions. These measurements can be performed using the R&S CLGD DOCSIS cable load generator, which was launched by Rohde & Schwarz in May 2014.