A system for communication in a downhole tool string comprises an electromagnetic network integrated into the downhole tool string. The electromagnetic network comprises a plurality of band-pass filters and a plurality of network nodes. The plurality of network nodes are along the tool string. The plurality of network nodes is adapted to transmit multiple data bits simultaneously. The system also comprises a server in communication with the electromagnetic network. A method for data transmission in a downhole tool string comprises providing filters in a downhole network and providing a first network node and a second network node. The filters are band-pass filters. The method further comprises modulating a data signal, transmitting multiple bits simultaneously, filtering the data signal, and demodulating the data signal. The data signal is modulated and the multiple bits are transmitted between the first and second network nodes.
 This invention was made with government support under Contract No. DE-FC26-01 NT41229 awarded by the U.S. Department of Energy. The government has certain rights in the invention.