WISI
VALUE LINE
© WISI Communications GmbH & Co. KG
-21-
VX 29 B series
RF amplifier, remotely powered
Operating instructions
Upstream interstage attenuator
HFC manager: UPSTREAM > Interstage Attenuator >
0...15 dB
0.5 dB steps
Handset:
Upstream > US IntStageAtt
Upstream interstage slope
HFC manager: UPSTREAM > Interstage Slope >
0...12 dB
1.0 dB steps
Handset:
Upstream > US Slope >
Ingress control switch (ICS)
HFC manager: UPSTREAM > ICS >
0 / 6 / > 45 dB
default: 0 dB
Handset:
Upstream > US ICS >
4.4 Spectral monitoring
WISI
VX 29 B makes use of an integrated RF tuner for spectrally resolved level
measurements of the amplifier‘s input and output signals.
This enables spectral monitoring of downstream signals (as following), and moreover
the auto-alignment routine (section 4.5) and the automatic level and slope control
(ALSC, section 4.6).
NOTES on the reference point for the measurements:
• The output measurement signal is tapped from the diplexer output (see diagram
in section 4.1).
• The measurements are compensated for losses of the output path including the
insertion loss of the detected output configuration modules.
• The monitored output levels are given for the signal interface RF in/out 1, so
keep in mind that RF in/out 2 can deviate if an asymetric
output configuration
module
(see section 4.1.1) is plugged.
• Input measurements are compensated for losses of the input path from the
connector to the detector.
