R&S®CLGD DOCSIS Cable Load Generator

Multichannel signal generator for DOCSIS 3.1 downstream and upstream

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

Brief Description

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.

Features & Benefits

  • Signal generation for channel loading scenarios in the downstream
  • Cable modem data traffic simulation in the upstream
  • Signal interference and distortion simulation

Specifications

Frequency range
downstream 47 MHz to 1218 MHz
with R&S®CLGD-K3018 option 47 MHz to 1794 MHz
upstream 5 MHz to 204 MHz

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

Brief Description

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.

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 below 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 or internally generated by the R&S®CLGD. The upstream frequency range is from 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.

Features & Benefits

  • Signal generation for channel loading scenarios in the downstream
    • Realtime modulation of DOCSIS 3.1 and J.83/A/B/C
    • Combined load simulation of DOCSIS 3.1, digital and analog TV
  • Cable modem data traffic simulation in the upstream
    • Any combination of OFDMA, TDMA and CDMA signals
    • Trigger function for burst timing control
  • Signal interference and distortion simulation
    • Noise, impulsive noise and phase noise
    • Microreflections
    • AC hum
    • Uptilt and downtilt
    • Ingress simulation with superimposed interference signals

Specifications

RF parameters
Frequency range downstream 47 MHz to 1218 MHz
  with R&S®CLGD-K3018 option 47 MHz to 1794 MHz
  upstream 5 MHz to 204 MHz
Level   adjustable up to max. 62 dBmV
Tilt   adjustable up to ±15 dB (1 GHz)
MER DOCSIS 3.1, f = 500 MHz, B = 192 MHz typ. > 53 dB
  2 × 192 MHz DOCSIS 3.1 and 24 × J.83/A/B/C and f < 600 MHz ≥ 50 dB
  1 × J.83/A/B/C typ. > 45 dB
Multichannel signal Generation downstream up to 5 × DOCSIS 3.1 or
up to 2 × DOCSIS 3.1 and 158 × QAM
  with R&S®CLGD-K3018 option up to 8 × DOCSIS 3.1 or
up to 4 × DOCSIS 3.1 and 158 × QAM
  upstream up to 2 × DOCSIS 3.1 and 32 × DOCSIS 3.0
Downstream Modulation (R&S®CLGD-K200 option)
DOCSIS 3.1 bandwidth up to 192 MHz
  constellation 16QAM to 4096QAM,
overrange 8kQAM, 16kQAM
  FFT mode 4k, 8k
 J.83/A/B/C bandwidth 6 MHz, 7 MHz, 8 MHz
  constellation 64QAM, 256QAM
Analog TV   PAL, NTSC
Upstream modulation(R&S®CLGD-K300 option)
DOCSIS 3.1 modulation mode OFDMA
  bandwidth 6.4 MHz to 96 MHz
DOCSIS 3.0 modulation mode A-TDMA, S-CDMA
  bandwidth 800 kHz, 1.6 MHz, 3.2 MHz, 6.4 MHz
ARB waveform generator
Bandwidth   200 MHz
Number of files played simultaneously up to 10 MHz bandwidth 4
  10 MHz to 100 MHz bandwidth 2
  100 MHz to 200 MHz bandwidth 1
Interference Simulation (R&S®CLGD-K1050 option)
Noise   AWGN, impulsive noise, phase noise
Microreflections   up to 5 reflections
AC hum amplitude modulation 47 Hz to 200 Hz, 0 % to 6 %
Narrowband interference   AWGN up to 20 MHz bandwidth
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