R & S draws attention to the DSA’s RF characteristics; with low inherent error, it is optimised for measuring modulation error ratio (MER).
To maximize and maintain a high data throughput when surfing and consuming multimedia content, the DOCSIS 3.1 data over cable system interface specification was developed as a successor to DOCSIS 3.0. The new standard uses channels with a bandwidth of up to 192 MHz and OFDM coding, which provides a high data throughput in the direction of the cable modem. To remain competitive, cable TV network operators must integrate this standard and ensure that both existing television channels and DOCSIS data streams are transmitted reliably.
The R&S DSA can be used to install, maintain and service cable modem termination systems (CMTS) at cable headends. It is also intended for troubleshooting complex headend problems as well as problems with cable network components that occur in the field. The DSA, R&S says, is the only DOCSIS analyzer that can be used without restrictions both in the field and at the cable headend. It analyzes in the downstream and upstream (upstream in preparation) up to MER of > 50 dB. It measures without using cable modem chipsets, which typically deliver considerably poorer MER values. With its low inherent error, it offers the best MER performance of all realtime DOCSIS analyzers on the market.
To ensure interference-free coexistence of DOCSIS 3.0/3.1 and digital TV channels in cable TV networks, the R&S DSA can optionally analyze J.83/A/B and DVB-C digital TV signals. Here again users will appreciate the advantages of realtime signal processing, such as gapless fault analysis, quick result presentation and signal demodulation.
Rohde & Schwarz; www.rohde-schwarz.com