ABB ETL600 Instruction Manual page 326

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1 Purpose of document
This document describes the equalization process for the equipment ETL600 Rel.1, supported by
the PC program HMI600.
2 Abbreviations and Definitions
PLC link:
Local/Remote:
Note:
Channel:
Equalizer:
BER:
3 Equalizer concept
The ETL600 has an integrated equalizer separately for each configured channel. Two operation
modes are available: Amplitude equalization only and combined amplitude with group delay
equalization. The resulting amplitude response of each channel (with the selected equalizer and
none) can be viewed with the HMI600 software before activation and during operation without
interrupting services on the link.
It is possible to change later an active equalizer with amplitude equalization only to one with
combined amplitude and group delay equalization and vice versa (with short interruption of the link
due to equipment reset).
Instructed personnel can choose between 4 possible equalizer settings: None (no equalizer),
short, medium or long equalizer.
3.1 None (no equalizer)
The equalizer is bypassed.
This setting is working during first power up of the ETL600 equipment until instructed personnel
measures the channel and chooses another equalizer. There is no added system delay. This is the
best possible value for the system group delay. Note that the operation mode 'Amplitude
response equalization only' or 'Combined group delay and frequency response equalization'
has no effect in this case.
3.2 Short equalizer
The short equalizer compensates the amplitude response of the channel with a minimum of
additional delay. This additional delay can be viewed in the 'Select equalizer' box.
If 'Amplitude response equalization only' is selected, no group delay equalization is performed.
The resulting amplitude response is acceptable.
If 'Combined group delay and frequency response equalization' is selected, a combined
amplitude and group delay equalizer is activated. Due to the additional group delay equalization,
the equalized channel amplitude response could have quite a ripple. Group delay distortion up to
1 ms can be equalized.
Please note that the additional group delay equalization must only be activated if there is a modem
present on that channel and the performance is better than with the 'allpass filter for group delay
Language:
EN
Two ETL600 terminals using a power line for signal transmission.
To distinguish between the two terminals of a PLC link, one of them is referred
to as 'local equipment', the other one as 'remote equipment'. Both directions of
a link are equalized separately.
To access the remote equipment, log ON using the equipment address of the
remote equipment. This is especially applicable for chapters 4, 5, 6, 9 and 10.
An ETL600 PLC link offers up to three AF channels for transmission of analog
signals. Each channel is equalized separately.
A filter that flattens the amplitude and/or group delay response of a channel.
Bit error ratio
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