3
ATB 19x
Part N
o
: 9848.xx
ASI - TV Transmodulator
ASI
→
ATV (AM)
The manual instructions of the Headend Controller HCB x00 and the Bus Extender BEB x00 have to be considered!
4. Front view
5. Function description
With this transmodulator, the digital ASI signal is decoded and then transferred into a serial data stream. Next, that data stream is
parallelised and fed into a FIFO system. The timing of this data input will in all cases be calculated from how full the FIFO system is
and adapted to the general data input rate. The regeneration system for the transport stream SPI protocol follows at the FIFO system
output, and at the same time, recognition of the transport stream being correct is ensured. It is at this level that the transport stream
can be edited.From the transport stream, the succeeding MPEG decoder selects a programme and generates an analogue video
signal and a digital audio signal. In the D/A converter which comes next; these two are converted into two analogue audio channels.
The analogue signals are fed into separate modulators and then aggregated in the IF (intermediate frequency) position. Then the
IF filtering takes place, and after that the production in the desired output channel. The fact that mixers are used which can accom-
modate a high output, also fractional N-PLLs, guarantees high-quality transmission. There is a free choice of frequency in the output
channel from 45 to 862 MHz. On the output side, the modulator does not leak to adjacent channels. If the output level changes, the
red LED will flash. Every time the level or frequency figures are programmed, automatic measurement of the reference level takes
place; his function will, however, not start until 100 seconds have elapsed after start-up of the system. When the output load changes
(perhaps because the output cable is disconnected), a warning and display item for a level fault may also appear. When the fault has
been identified, the appropriate SNMP Trap message will be sent. Use of this function is optional. By activation of the respective soft-
ware option the services like test lines, the flash of subtitles and BISS decryption can be used.Supported are the BISS mode 1 and
the BISS mode E with input of the necessary Injected ID, but not the BISS mode E with the additional input of the optional Buried ID.
6. Adjustments
6.1 Adjustment with the Headend Controller
· Adjustment of the addresses at the Bus Extender BEB x00 and at the modules
· Activation of the programming mode of each module by selecting the line (BEB x00) and the module position (01... 15) at the
Headend Controller(HCB x00)
→
yellow LED will be lit up til the beginning of the parameter adjustment
· Adjustment of the ATB 19x parameter (see chapter 10)
→
green LED is lit up
· After the programming the ATB 19x will be automatically switched into the operating
→
yellow LED lights up briefly / green LED is lit up
6.2 Adjustment with the PC / Laptop
· Condition for the remote programming is an “online - connection” after IP - standard and an ethernet connection at the PC / Laptop
· Adjustment of the line / position addresses at the Bus Extender BEB x00 as well as at the modules
· At the Headend Controller HCB x00 IP - address input (e.g. 192.168.001.001)
· For “direct connection” between a PC and HCB x00 use a crossed patch cable (RJ 45)
· For connection over a deviation use an uncrossed patch cable
· HTML - browser start-up and put in IP - address as target address
· If connected correctly the HTML - control surface at the PC will open up and a blue LED (LINK) at the HCB x00 will be lit up).
· All adjustment of the modules are specified at the control surface.
ASI-TS input port
LED input
ASI-TS output port
LED output
Operating voltage/
control bus
“STANDBY“ LED (red)
“READY“ LED (green)
“ADDR.“ LED (yellow)
Adress selector switch
RF output for TV
