Basic Instrument Concept - Rohde & Schwarz DOCSIS 3.0 Guía De Inicio

R&S SFD

2.2 Basic Instrument Concept

The R&S SFD is a small form factor advanced piece of test equipment designed to
generate a single DOCSIS signal. Configuration and control of the unit is done via the
web GUI, SNMP or SCPI.
The R&S SFD operates in one of two main modes: Downstream or Upstream. In each
mode a single DOCSIS 3.0 or 3.1 signal may be generated in real time. Alternatively,
an arbitrary waveform may be output. The unit comes with a default configuration for
each mode. Switching from one mode to another may result in a delay of up to 1
minute in operating the unit as the R&S SFD must load a new configuration file into the
FPGA.
The R&S SFD has two modes Downstream and Upstream. In Downstream mode the
R&S SFD is able to output a DOCSIS 3.1 channel with a maximum bandwidth of 192
MHz. The valid output frequency range for this mode is from 108 MHz to 1,218 MHz.
With the Extended DOCSIS 3.1 license option the R&S SFD supports a valid output
frequency range up to 1,794 MHz.
The R&S SFD is also able to generate a legacy DOCSIS 3.0 carrier with a valid output
frequency range from 47 MHz to 1,218 MHz. Legacy DOCSIS 3.0 carriers can be set
to one of three RF transmission types: J83B, J83C or DVB-C.
The Upstream mode allows users to transmit a real-time data encoded burst DOCSIS
3.0 or 3.1 signal. The Upstream burst signals are initiated using the Trigger In interface
and a Marker Out signal is asserted before transmission. There are two DOCSIS 3.0
options for the upstream signal: A-TDMA and S-CDMA. The valid output frequency
range is between 5 MHz and 85 MHz.
The R&S SFD is also capable of generating a real-time data encoded DOCSIS 3.1
OFDMA signal. The following burst types are available: Data Mode, Initial Ranging
Mode, Fine Ranging Mode, Wideband Probing Mode, or Bandwidth Request (BW
REQ) Mode. For Data Mode and Fine Ranging Mode, the payload can be provided via
the SFP Data Interface. For Initial Ranging Mode and BW REQ Mode, the payload is
customizable through the Web GUI. The valid output frequency range for this mode is
from 5 MHz to 204 MHz.
Getting Started 2118.7546.02 - 02
Brief Introduction
Basic Instrument Concept
16