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QAMOS-CT •
Part No. 5120.01
•
DVB-C /-T /-T2 Transmodulator
4.3 LEDs at the input jacks
Color
Status
Meaning of the display
green
constant
satellite signal port has been configured as input, works properly
amber
constant
satellite signal port has been configured as output (only port “IN/ OUT“)
flashing
LNB overcurrent (e.g. by short circuit) and/ or LNB overheated, port is
disabled temporarily
off
no tuner is locked on this input or port is deactivated (only port “IN/ OUT“)
4.4
LED at the output coupler
Designation
Color
Status
Meaning of the display
LOOP
green
constant
loop active, i.e. nominal level range 62 ... 82 dBµV
-
off
no loop, i.e. nominal level range 74 ... 94 dBµV
4.5 LEDs at the 10 / 100 Mbit control port
Designation, color
Status
Meaning of the display
Connect-LED, amber
constant
network cable is connected
off
no cable connection
Data-LED, green
flashing
exchanging data
off
no data exchange
5. General
The Smart Business Line (SBL) is a modern headend system, that is distinguished by its modular and compact design. A
userfriendly operating concept facilitates setup, configuration and maintenance of the system.
The module converts digital terrestrial signals into QAM signals to transmit it in cable networks. In this case, up to 8
QAM channels from the available DVB-C /-T /-T2 signals are generated, which are attached via two inputs. The internal
processing allows the output of DVB signals in full HD resolution.
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. Functional description
The DVB-C /-T /-T2 signal is fed through 2 inputs or a loop-through input by a switching matrix to the input parts and
their demodulators. The resulting 8 transport streams are processed with a high-performance FPGA. The transport
stream processing or filtering, the QAM modulation and the freely adjustable up-converting in the cable network range
(45 ... 862 MHz) take place in the FPGA.
The eightfold modulator is adjacent channel compatible. A highly-clocked digital to analogue converter (DAC) does the
spectrally pure output of the cable signal. After amplification and sum level adjustment, the cable signal is coupled
through a directional coupler to the output jacks.
