The invention is a port in a multi-port bridge for a local area network having a vector buffer for storing vectors relating to the routing of data packets received in the port. A gas-admittance body forming vertically superimposed gas-admittance regions is used to separately introduce at least one first and one second gaseous starting material, said starting materials flowing through the process chamber with a carrier gas in the horizontal direction. The method includes starting a personal-authentication application on the personal-mobile device in response to receiving the first communication, and receiving in the personal-authentication application a user verification for confirming logging into the account. With this scheme, if the baseband transmission of a is realized with positive voltage V and transmission of a is realized with a negative voltage V, then any concatenation of symbols is dc-free.