Making the Most of Bandwidth with SPINNER In-Building Solutions

Component quality matters. Its impact on overall system performance is often underestimated in in-building projects. That is understandable – the essence of quality is hard to distill from all those figures you see when comparing datasheets. This is why many people ask themselves, “Why should I buy the more expensive solution if the cheaper one offers the same specs? But does it really do that?

SPINNER In Building DAS Efficiency

Three factors of the combining process have a big impact on the system’s performance, particularly in terms of available bandwidth:

Passive Intermodulation (PIM)

Passive intermodulation occurs when multiple frequencies share the same transmission medium. This results in mixed signals that can sit in the receiving band of a useful signal and add to its background noise. The more frequencies are mixed, the higher the probability that these mixed signals will occupy the useful signal’s bands.

The lower the passive intermodulation, the fewer the mixed signals occupying the receiving band and the better the signal-to-noise ratio.

SPINNER In Building DAS LowPim ENNearly 500 – that’s the number of potential interference signals in a classic 16-band in-building system with four operators with four frequencies each


Isolation indicates to what extent two ostensibly independent useful signals influence each other. The higher the isolation, the better the signal-to-noise ratio. It serves to separate signals to ensure “clean” transmission.


Transmitting a useful signal via a mismatched product that does not have the ideal impedance can give rise to a reflected signal. This reflected signal influences the transmitted signal. The lower the reflection, the better the signal-to-noise ratio.

All three factors affect the signal-to-noise ratio, a measure of a useful signal’s quality that is degraded by a noise signal. Noise signals are always present. The lower the signal-to-noise ratio, the poorer the system’s transmission rate system.

The graph below illustrates how the signal-to-noise plus interference ratio affects the transmission rate:

SPINNER In Building RF Networks EN

The higher the quality of a combining system, the higher the transmission rate. A few percent saved on the cost of a cheaper solution leaves a little more money in your pocket, but it comes at the stiff price of much poorer transmission rate. And an inadequate combining/distribution system is going to devalue your investment in expensive tech.

SPINNER combining solutions deliver this premium quality. Our R&D department goes to great lengths to make sure every product’s design is maximized for minimum interference. These engineers also select the materials and production methods to the same end. This is why SPINNER is able to build systems that achieve the highest transmission rates on the market.

© 2021 | SPINNER GmbH | Erzgiessereistr. 33 | 80335 Munich | Germany
Phone +49 (89) 12601-0 | | Imprint | Data Privacy Policy