AN APPARATUS INCLUDING A TRANSCEIVER

An apparatus comprising:a receive-input for coupling to a transmission medium;a transceiver configured to receive signals representative of one or more data transmission units from the receive-input and output said data transmission units;a protocol module configured to process at least a subset of the one or more data transmission units output from the transceiver according to a protocol, said processing including at least removing one or more fields of information from said subset of data transmission units associated with said protocol; andwherein the apparatus is configured to add at least one field to the subset of data transmission units processed by said protocol module, the at least one field comprising protocol information derived from said processing by the protocol module and provide said data transmission units with the at least one field added to a receive-output of the apparatus.