A connector system for transferring power from a backplane to a module mounted on the backplane comprising: a first magnetic E-core having a center leg and first and second outer legs, the center leg and the outer legs being joined at a first end thereof and being mounted with a second end thereof extending into openings (22, 24) in the backplane, the backplane having a printed coil encircling at least one of the three legs; a second magnetic E-core having a center leg and first and second outer legs, the center leg and the outer legs being joined at one end thereof and being mounted with a second end thereof mounted adjacent an end of the module, the module having at least one wound coil encircling at least one of the three legs; the backplane and the module being configured so that the second end of each leg of the magnetic E-core on the backplane is aligned with the corresponding leg of the magnetic E-core in the module when the module is mounted to the backplane; and also for signal transmission for at least one of a backplane to a module mounted on the backplane, and a module to a backplane to which the module is mounted, further comprising: first and second magnetic I-cores; the first magnetic I-core being mounted with an end thereof extending into an opening in the backplane, the backplane having a printed coil encircling the first magnetic I-core; the second magnetic I-core having an end thereof mounted adjacent an end of the module, the module having at least one wound coil encircling the second magnetic I-core; the backplane and the module also being configured so that the end of the first magnetic I-core is adjacent the end of the second magnetic I-core when the module is mounted to the backplane. a first magnetic E-core having a center leg and first and second outer legs, the center leg and the outer legs being joined at a first end thereof and being mounted with a second end thereof extending into openings (22, 24) in the backplane, the backplane having a printed coil encircling at least one of the three legs; a second magnetic E-core having a center leg and first and second outer legs, the center leg and the outer legs being joined at one end thereof and being mounted with a second end thereof mounted adjacent an end of the module, the module having at least one wound coil encircling at least one of the three legs; the backplane and the module being configured so that the second end of each leg of the magnetic E-core on the backplane is aligned with the corresponding leg of the magnetic E-core in the module when the module is mounted to the backplane; and also for signal transmission for at least one of a backplane to a module mounted on the backplane, and a module to a backplane to which the module is mounted, further comprising: first and second magnetic I-cores; the first magnetic I-core being mounted with an end thereof extending into an opening in the backplane, the backplane having a printed coil encircling the first magnetic I-core; the second magnetic I-core having an end thereof mounted adjacent an end of the module, the module having at least one wound coil encircling the second magnetic I-core; the backplane and the module also being configured so that the end of the first magnetic I-core is adjacent the end of the second magnetic I-core when the module is mounted to the backplane. first and second magnetic I-cores; the first magnetic I-core being mounted with an end thereof extending into an opening in the backplane, the backplane having a printed coil encircling the first magnetic I-core; the second magnetic I-core having an end thereof mounted adjacent an end of the module, the module having at least one wound coil encircling the second magnetic I-core; the backplane and the module also being configured so that the end of the first magnetic I-core is adjacent the end of the second magnetic I-core when the module is mounted to the backplane.