Used as KNX Line/Area Coupler, MECtp connects a main line and a subline to enable KNX communication between both KNX TP lines. Used as KNX Repeater, MECtp can also be used to extend an existing KNX TP line by adding segments. Filtering of group communication and physically adressed telegrams is configurable. Transmission of configuration telegrams from subline to main line can totally be switched off. Special functions to ease troubleshooting, to accelerate commissioning and to avoid unneccessary telegram traffic are additionally available.