Sat multiswitch in the attic or basement?

But be careful with cable connections: The cables are only allowed to have 95db, otherwise the technician is not allowed to connect them. We installed 120db.

That is pure nonsense!

The cable network operators prefer triple-shielded cables with shielding attenuation and coupling resistance with genuine Class A+, but they also accept double-shielded full copper cables with proven Class A for existing cables. The values can always be better. 100 dB shielding attenuation is technically easily achievable even with double shielding, Class A alone already reduces radiated interference emissions and system emissions to a harmless homeopathic dose; more is not necessary.

4- and 5-fold shielding only complicate the laying and connector assembly, but with this you can impress clueless laypeople in combination with dishonest peak-oriented shielding attenuation values (individual peak value outliers). Those who advertise honestly and seriously make less turnover as with the physically impossible noise figure specifications of LNBs; many customers want to be deceived, as long as it’s cheap.

The worse a cable is, the more loudly it is advertised as HD-compatible, etc. If a cable network operator has rejected the cable, then not because of too high shielding attenuation, but because it

[*]has a mesh of fragile and under-modulation-prone aluminum mesh

[*]multiple pointless shielding layers

[*]poor coupling resistance

or multiple points apply.

According to the current DIN 18015, multiswitches should be installed in central communication distributors and from there all IuK and RuK lines should be distributed in a star topology. This usually requires installation in the basement.

Tell me Dipole, if the multiswitch is to be placed in the (not just a) central communication distributor, how is the potential equalization of that distributor realized? The multiswitch may only be grounded via the mast (loop-free). A communication distributor must also be connected to the potential equalization, but then the setup would no longer be loop-free, right? What is the solution: a) also ground the communication distributor exclusively via the mast b) build the multiswitch isolated in the central communication distributor and ground separately c) completely different (detailed explanation welcome) ??

According to the current DIN 18015, multiswitches should be installed in central communication distributors and all IuK and RuK lines should be distributed radially from there.

This usually requires installation in the basement.

Is this conclusion really mandatory? Why shouldn't a central communication distributor also be located in the attic?

I am affected in this regard because I am buying a house with SAT wiring from the developer. Therefore, I would like to know where the multiswitch should or may be located.

Is this conclusion really inevitable? Why shouldn’t a central communication distributor also be in the attic?

mostly does not mean necessarily. Furthermore, DIN 18015 can be (contractually) excluded.

I am affected in this respect because I am buying a house with SAT cabling from the developer. I would like to know where the multiswitch should or may be located.

I strongly doubt that the environmental conditions in an uninsulated attic are suitable for a multiswitch. It simply gets too warm.

What is the solution:
a) Also ground communication distributors exclusively via the mast
b) Build the multiswitch isolated in the central communication distributor and ground separately
c) completely different (detailed explanations welcome )

??

Only a few readers will know that this is primarily about the concept of loop freedom, which according to IEC 60728-11 is required for the equipotential bonding (PA) of conventionally directly grounded antennas. For easier understanding, below is a basic list in order of priority:

[*]Ideally, all supply and communication lines should be introduced into the building at one point; LEUTRON has coined the term Single-Entry-Point Principle for this
[*]Loops should be avoided to couple as little inductive lightning currents as possible
[*]The shields of all cables and lines that enter or exit the building from LPZ 0A must always be included in the PA as close as possible to the building entry point
[*]Thus, the shields of underground cables for cable TV and fixed-line telephone networks must be included in the protective equipotential bonding at the HES via the shortest possible route, without alternative
[*]The cable shields of suboptimally directly grounded rooftop antennas, on the other hand, are usually to be included loop-free near the mast/antenna on the lightning current-capable grounded antenna carrier; in exceptional cases, when the cable is routed lower into the building, they must then be included in the PA there

The IEC 60728-11, which is primarily relevant for antenna safety, has, unlike the other IEC 60728-x standards, not yet really arrived in the multimedia world with the convergence of various media.

Weighing all aspects, when connecting rooftop antennas which must be grounded to a cable TV or telephone network, the loop-free PA of the rooftop antenna inevitably fails. Therefore, the PA of the antenna lines, besides at the grounded antenna carrier—as is already the case with direct grounding on lightning protection systems—must inevitably also, non-loop-free, be connected at the HES.

The internal normative discrepancy of IEC 60728-11 thus does not occur in the case of

[*]Direct grounding to a lightning protection system
[*]Antenna installation in LPZ 0B of separated air-termination systems
[*]Antenna installation in facade areas not requiring grounding

With direct grounding, in the event of lightning strikes, partial lightning currents are inevitably coupled into the antenna system and connected terminal equipment, which is why this type of protection still corresponds to the recognized rules of technology (= minimum standard) but no longer to the state of the art.

A picture tells more than words; for deeper understanding, two slides of rooftop antennas with and without lightning protection system as well as with and without separated air-termination system