A contacting component has a probe contact formed by plating and adapted to be contacted with a target portion. 01% to 2% by weight of at least one element selected from magnesium, calcium, strontium, barium, yttrium, hafnium and zirconium. The radiation source may be a UV LED in which case the indicia include a UV reactive material that renders the indicia visible in the presence of UV radiation. The photonic switching system includes a demultiplexer for dividing incoming light into different wavelengths or wavebands. The solution is achieved by a method and arrangements for handling at least a first c line in a SDP and for inserting a CS address into the first c line and means for indicating in said first c line that the address is associated with a CS connection.