1.
Time scale selector. User can select the scale and accuracy (1 / 15 / 60 minutes). The lower
accuracy, the longer the period available for data (mechanism of the performance
management system)
2.
Updates the performance graph; the latest data is shown
3.
Shows / hides period settings (point 5)
4.
Performance data selector. Only two performance parameters can be selected at a time
5.
Period settings. Allows the user to specify time period for the graph
6.
Date and time fields. The date format is “yy-mm-dd”, the time format is “hh:mm”
7.
Sets date and time fields (point 6) one screen back / forth
8.
Shows / updates the performance graph using the period settings (point 5)
9.
Performance graph. Displays two performance parameters. Each parameter is shown with
the minimum and maximum curves, which are in the same color. The curves in red have the
scale on the left, while the curves in blue have the scale on the right
10.
Time scale. Shows the time scale chosen from the time scale selector (point 1) for the
performance data available. If no data is available for the according moment, “__:__” is
shown
11.
Legend for the curves of the performance graph. Contains the color, the name and the unit
of measurement, if available.
In case no performance data has been recorded, or the period specified has no data, “No data” is
shown (instead of points 9, 10, 11).
5.2.4
Adaptive Equalizer
CFIP PhoeniX features adaptive equalizer, which is a filter that automatically adapts to time-
varying properties of a communication channel with selective fading, having a target to compensate
the inequalities in frequency response, mitigating the effects of multipath propagation. In wireless
telecommunications, using QAM modulation this filter equalizes not only a separate quadrature
channel, but provides a cancellation of cross-interference between them.
In current CFIP device an adaptive equalizer is realized as complex-arithmetic 24-taps digital FIR
(Finite Impulse Response) filter. In other words, equalizer is a selective frequency amplifier and
attenuator, a device, which application to IF (Intermediate Frequency) band-limited signal is
schematically shown in the picture below:
Figure 5.11
Equalizer operation
Equalizer graph window shows adaptive equalizer taps’ coefficients, which at a set time moment
minimize multipath fading effect in channel.
Example of equalizer taps’ coefficients and its frequency response in case of a normal operation
is shown below:
CFIP PhoeniX Series TDM/IP Split Mount System Technical Description and Configuration Guide
•
Rev. 1.13
•
© SAF Tehnika JSC 2015
91