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General Description
The US segment of the ISS was build around a large multipart truss structure requiring several launches to fully assemble. The truss would support the US modules, solar arrays and heat radiators. The truss would ultimately be attached to the US Lab module on attachemnts on the exterior of its hull. But the Lab couldn't be powered until the truss's solar arrays were in place, a chicken and the egg dilema. The solution was to place the first truss segment on the ISS first and add the Lab afterward, then moving the Truss to its final attach point on the lab at a later time.
The Z1 truss segment was created as the base on which the initial truss segment would be temporarilly attached. Z1 is a box structure which docks the a Node-1 docking port, with the first Truss segment attached to the other end of the S0 truss.
Images from NASA, ESA, NASDA, CSA, RSA
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