OPU-1
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
GENERAL DESCRIPTION - Rev 7 (May 2019)
40/67
4.1
SYSTEM MENU
This menu contains three options. The first gives access to the reading functions of the disk
or terminal and writing functions to disk or in the terminal. The second allows the pages
necessary for carrying out off-line Web Management to be downloaded as well as the
display of the module software versions. The third gives access to the options which allow
the specification of: the web server user passwords, the basic network management
parameters (IP address, subnetwork mask and gateway), that must be compatible with
those of the management computer.
4.2
CONFIGURATION MENU
This menu allows the programming of the terminals to be defined, that is to say, their
identification
and
configuration,
transmission
and
reception
frequency
bands,
audio-frequency input and output levels, signal-level percentages for each service, digital
modulation scheme (QAM or OFDM/OQAM), gross bit rate of the QAM digital modem,
digital ports programming as well as the operative parameters of the optional analog
modules. It also allows alarms to be assigned to the external signalling relays.
❖
Terminal configuration
In the OPU-1 terminals it is possible to program a numeric identification and a
description of up to 50 characters.
Before programming the operating parameters it is necessary to configure the terminal.
The output power (which can be of 20, 40 or 80 W), the operating mode and the options
incorporated in the equipment are defined by means of this configuration.
For the analog channels, should the reception of the terminals of the link need to be
synchronized, synchronization mode must be configured. For the QAM digital channel,
to establish whether the terminal should operate as master or slave.
❖
Carrier-channel frequencies and bands.
The carrier frequency of the analog channel is defined by introducing, from the
management terminal, the values of the virtual carrier frequency, for transmission and
reception, and the type of band, which can be erect or inverted.
For the digital channel, the central-frequency values for transmission and reception
must also be introduced, and whether the transmission and reception bands are
superimposed or non-adjacent. It must be taken into account that when programming
superimposed bands for the QAM, the echo canceller is being activated at the same
time. In the case of superimposed bands, the frequency values in transmission and
reception must be the same.
