OPU-1
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
GENERAL DESCRIPTION - Rev 7 (May 2019)
44/67
Line-filter adjustment
For each transmission channel the Alignment help menu indicates the jumpers to be made
for the programming of the central frequency of the line and receive filters as well as the
adjustment of inductances for the setting of the bandwidth of these filters. This adjustment
is carried out by means of a signal generated by the OPU-1 terminal's own transmitter.
Control of audio-frequency loops (analog channel)
To control the state of a communication system it is necessary to know the response curve
of each link. The Web Management allows the user to obtain this information from one end
of the link by establishing two types of loops at the other end. The first, which has
signal-level regeneration at the said end, enables the response curve of the return circuit to
be made known. This is possible thanks to the measurement of the received signal, for
which it is known that the transmission level is constant. The second loop, which does not
have signal-level regeneration, allows the response curve of the looped circuit to be
obtained and, therefore, allows the response curve of the outward circuit to be calculated.
The response curves are obtained by carrying out a channel sweep by means of an
external generator. The Alignment help menu indicates how to carry out the operations
mentioned.
Port loops
This option allows a data loop to be carried out in the ports associated to the digital
channel.
