Test & Measurement

DOCSIS 3.1 signals delivered in real time

7th June 2016
Mick Elliott

The Rohde & Schwarz R&S SFD DOCSIS signal generator delivers signals in line with the DOCSIS 3.1 transmission standard in real time. This enables cable network operators and component manufacturers to quickly and easily check whether their networks and/or equipment satisfy DOCSIS 3.1 requirements. This one-channel signal generator is extremely compact and highly customisable thanks to its software options concept.

The signal generator produces high-quality upstream and downstream signals in real time in line with DOCSIS 3.1, DOCSIS 3.0 and J.83/A/B/C. It also supports analogue cable TV standards.

Depending on the standard, the signal undergoes OFDM, A-TDMA, S CDMA or analogue modulation. The level, frequency, forward error correction (FEC) and constellation can be configured. The R&S SFD supports the transmission of TV services as well as data services.

Data can be generated internally or fed from external sources over IP.

Thanks to its digital signal generation capabilities, the R&S SFD is ideal for testing tuners, cable modems and upstream CMTS receivers in R&D and production, as well as for simulating DOCSIS 3.1 signals in real cable segments.

For realistic signal generation, the generator can add interference such as noise, phase noise, hum, tilt and even a defined bit error rate. It has an ARB generator that can generate signals with up to 200MHz bandwidth.

The R&S SFD comes in a one-half 19in housing that takes up merely two height units. The complex signal generation process can be conveniently configured from a PC via a web GUI.

Remote control via SCPI commands enables the generator to be used in automatic test systems.

The instruent can be adapted to different applications thanks to its software options concept.

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