or internally generated by the R&S®CLGD. The upstream

frequency range is 5MHz to 204MHz. Within this range,

DOCSIS3.1 orthogonal frequency division multiple access

(OFDMA) signals can be freely combined with DOCSIS3.0

TDMA or CDMA signals.

The flexible multichannel signal generation capabilities of

the R&S®CLGD enable it to simulate network loading in

a reproducible manner, making it ideal for testing tuners,

cable modems and upstream CMTS receivers. The influ-

ence of QAM and TDMA/CDMA signals in adjacent chan-

nels on DOCSIS3.1 signal reception is a research topic

of great interest. The R&S®CLGD makes such simulations

realistic by adding different types of interference, such as

noise, reflections and narrowband interference.

The generator is accommodated in a 19" housing that

takes up a mere two height units. The complex signal gen-

eration process can be conveniently controlled from a PC

or via a web interface. Remote control through SCPI com-

mands enables the generator to be used in automatic test

systems. The R&S®CLGD can be adapted to various appli-

cation requirements thanks to its software option concept.

Key facts

❙ Frequency range in downstream: 47MHz to 1218MHz,

extendable to 1794MHz

❙ Frequency range in upstream: 5MHz to 204MHz

❙ DOCSIS3.1, DOCSIS3.0, J.83/A/B/C and analog TV

❙ Up to eight times 192MHz signal bandwidth for

DOCSIS3.1

❙ ARB generator bandwidth up to 200MHz

R&S®CLGD

DOCSIS Cable Load

Generator

At a glance

The R&S®CLGD is the first generator that simultaneously

produces signals for DOCSIS3.1, DOCSIS3.0, digital

cable TV in line with J.83/A/B/C and analog cable TV. Its

downstream frequency range is 108MHz to 1794MHz

for DOCSIS3.1 and 47MHz to 1218MHz for TV. Within

this range, the R&S®CLGD generates multiple DOCSIS3.1

channels with up to 192MHz bandwidth each. The level,

frequency, forward error correction (FEC) and constellation

of these channels can be set independently. At the same

time, the R&S®CLGD produces a large number of digital

and analog TV signals that can be placed anywhere be-

low or between the DOCSIS3.1 signals. The DOCSIS3.1

channels and digital TV channels are implemented in

realtime. The data to be transmitted can be fed in via IP

The R&S®CLGD is a multichannel signal generator

for simulating a cable TV network with full channel

loading. It generates broadband data signals

for DOCSIS3.1 as well as digital and analog TV

channels. In the downstream or upstream, signals

can be freely combined, allowing users to simulate

any conceivable channel loading scenario in the lab.

CLGD_bro_en_3607-0123-12_v0200.indd 2 24.07.2015 08:03:32