In a method of data transmission in a data communication network, data packets may be tormatted according to different transmission protocols (“secondary data packets”) that are received for transmission through the data communication network and may be packed into one or more “primary data packets” formatted according to the transmission protocol of the data communication network. In addition to a sequence number, the primary data packets may include a first packet offset to identify the location of a first new secondary data packet that is packed into the primary data packet. A first packet offset field length may be determined during connection negotiation. The data transmission method of the invention may include packing one or more secondary data packets, or a portion thereof, in a primary data packet to fill the primary data packet, thus minimizing unused data bits in the primary data packet.