An inkjet head includes a passage member having an ink passage formed therein. The chain driven reciprocating hammer includes a chain system for lifting a ram to a drop point. A surrounding reflecting arrangement can be provided around the diodes and an additional reflecting arrangement in form of a layer on the plane may also be utilized. The first supporting frame supports the first end. The system may include one or more receivers, each receiver being configurable in a plurality of states, wherein in each state the physical layer headers associated with received frames of information are used to determine the format in which the received frames of information are to be decoded. The electronic signature is a cryptographic key of the called party.