Office Building Solution

BU I LDI NG SOLUT IONS

30

— Architecture and configuration of a KNX system

— Twisted pair copper cables (TP)

— Ethernet

It is a communication through a twisted two-core cable (helical winding), shielded and with double insulation (main and functional).

In this case the communication is carried out by transferring KNX telegrams over the Ethernet network “encapsulated” in packets in the widely used IP (Internet Protocol) standard, regardless of the particular transmission medium. In larger KNX installations, the IP network can therefore be used as a high- speed backbone (Fast-Backbone) to transmit KNX telegrams, according to a procedure known as “KNX/IP routing”.

In a KNX system, the EIB-derived TP-1 bus is used, with a speed of 9,600 bits/s. By means of this transmission medium KNX and EIB devices communicate and are fully interoperable with each other. The cable to be used must be KNX-certified of type YCYM 1 x 2 x 0.8 or 2 x 2 x 0.8 mm; in the case of the 4-conductor cable, the red-black pair is dedicated to signal and power transmission and the yellow-white pair to additional SELV applications. Where the use of halogen-free cables is required, KNX- certified cable type J-H(St)H 2 x 2 x 0.8 can be used.

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