TechniSat TechniRouter 5/1x8 K - Handbuch (Seite 39)

39
EN
Flush-Mounted Distribution Rack:
For installation in the staircase, which is the optimal arrangement for a star distribution from the
middle of the home, you should install a flush-mounted (or on-wall) distribution rack. This can also
contain, if required, an intermediate amplifier or other components. We advise that the door
should be sealed with a safety lock.
5.2 Planning
For large-scale installations a calculation of “coverage” is necessary.
This means you must consider the following points:
1. Power supply
2. Level
3. Isolation
4. Voltage drop
Be careful to ensure that the power supply to the LNB is continually safeguarded.
Satellite Range:
• It is important (especially where many subscribers share a single cable) to ensure, that only
top quality sockets are installed.
• Set up an assembly plan including details of all cable lengths.
• The loss between the TechniRouter and the receiver (all cables, sockets and / or splitter)
may range from a minimum of 12 dB to a maximum of 45 dB.
• TechniRouters have a gain of approximately 20 dB, hence do not operate with excessive
levels on the trunks - for satellite use, we recommend 70 dBμV.
• Record the existing and required levels at the inputs and outputs of the components, see
technical data and table 1 (cable losses).
• Note: particularly when installing more complex TechniRouter distributions, even minor
carelessness can accumulate to a large overall error.
• Avoid overmodulation as well as going below the minimum level of the socket, see Table 3.
• A bit error rate (BER, measured before Viterbi-decoder) better then 10 -4 should be
guaranteed in each location.
•
The input signal range of the receiver (control range) is approx. 44 dBµV…84 dBμV.
• If necessary use low loss cables and/or an amplifier, that the level of the channels at the top
end of the band do not goes below the minimal value. Due to the frequency response drop of
the LNB and cables in practice a level decline of up to 10 dB at the last socket may occur at
the top end of the band, compared with the lower end of the band.
• Estimate the effect of any voltage drops on the feed lines to the TechniRouter. The voltage
supplied to the LNBs and for the accessories must remain at a sufficient level, for older
LNBs ≥ 11.3 V.
• Planning with consideration in regards to level reserves helps to ensure that the system
can function properly all year around.