Every integrated home system also specifies the maximum distances for the cables used. This too comes back to the guarantee of good operation. Sometimes, only a maximum length is specified for the bus cabling. In other cases, maximum mutual distances are specified between different bus participants. In many cases there are also distance restrictions for connecting sensors and pushbuttons to input modules. The non-observance of these maximum distances could lead to poor data communications. In order to bridge greater distances, bus amplifiers or repeaters can sometimes be used.