The headend layout contains 8 digital receivers with RF input to receive and convey 8 free-to-air or encrypted
channels, without needing a decoder. Every single module can receive and remodulate a single digital TV
program in PAL standard by a vestigial stereo modulator.
The headend has an input for mixing the existing TV signals and one RF output with TV signals that are
remodulated in VHF and/or UHF band by vestigial modulation. Figure 8 and 11 shows an example of a
headend connection to the TV installation. If the TV mixing input is not used, the CA75F load must be inserted
at the end; the load is supplied in the accessories packaging.
It the bottom part of the headend, there is the screw for the connection to the ground electrode of the antenna
installation according to the EN50083-1 regulation, art. 10 (see Fig.1).
In the event of short circuit on the TV inputs, when a device not properly working or installed is connected,
the power supply protects itself to safeguard the headend status. Once the anomalous operation is solved,
the headend switches on again automatically. If not, unplug the power to the network and then plug in back.
The headend manages the teletext and subtitles transmitted by the received programs; it is possible to
choose the language (only if available) from the subheadings.
Moreover, the receivers can be used to remodulate the digital radio channels. In this case, a preset fixed
window will be automatically shown by the video (TV, display ...).
It's possible to set the input and output parameters via software by means of the TPE universal programmer.
Then programming can be carried out also by means of the PC.
To make programming easier, the headend is supplied with the OSD (On Screen Display) enabled by the TPE;
it transmits the same menu of the TPE with a Help description on the display (TV, field meter). To use this
functionality, the TPE programmer must have the 0.7 version or a version more current.
Summarizing table of the LED status of each receiver :
Green LED
OFF
OFF
ON
ON
ON
FLASHING
FLASHING
FLASHING
The modules that are inserted can operate in three different modes: stand-alone, master, slave.
The module used in stand-alone mode is a completely single digital TV receiver independent from the others;
therefore, it needs the TV signal at its own coaxial input. Each receiver in stand-alone mode can receive a
free-to-air signal or a codified signal with a CAM (not supplied), suggested from the broadcaster.
Moreover, the module can be set in Master or Slave mode. The Master modules can be connected to one or
more Slave modules with a flat cable (contained in the headend packaging) thus permitting the reception of
several encrypted programs of the same multiplex with the Master CAM (if the CAM allows this operation.
Not all CAM versions which are on sale can support the simultaneous decoding of several channels). The
selected multiplex is set, by programming, on the receiver that operates in Master mode, which demodulates
and decrypts the signal of the selected multiplex. The signal goes through the Slave module by the flat cable.
The Master/Slave mode, by means of the flat cable, allows to convey from the Master module to the slave
ones all the programs received and (if the CAM allows it) the decrypting key. The parameters for the reception
of the selected multiplex and programs to be decrypted must be set up on the Master module and are then
transmitted to the Slave modules connected by the flat cable. Refer to the Menu SETTINGS on page 33. On
3. USER'S INSTRUCTIONS
Red LED
/
Receiver off
ON
Receiver boot
The receiver is properly supplied, but not
FLASHING
locked
OFF
The receiver is properly supplied and locked
The receiver is properly supplied but there is an
ON
internal fault
ON
Receiver interrogation and internal fault
OFF
Receiver interrogation and receiver locked
FLASHING
Receiver interrogation and receiver unlocked
23
Meaning