A data coding system is provided for coding an uncompressed data and decoding the coded data. The mobile node verifies the server side certificate received in the authentication procedure of authenticating the gateway, using a public key used for verifying a given zone in the DNS discovery procedure of discovering the gateway based on the signed zone data received for the gateway. In one aspect, a CDF includes a first set of data associating a depth value with each of a selected plurality of incoming mail centers to which an outgoing mail center sends mail pieces. The light energies from each pixel are summed to calculate the total light energy present at the specified view point. The at least one intelligence mechanism and the main capacitor are together configured to generate at least one type of output signal selected from long term induced failure mechanism signals and sudden capacitor failure condition signals in response to desired input signals. The light signals are transmitted through free space between the circuit boards and the connection of a circuit board in the electronic device is determined by the alignment of its optical transmitter andor receiver to make the connection.