 A variant of the design, termed the T400, not to be confused with a later transputer of the same name, was designed where the CPU handled these transfers.This reduced the size of the device considerably since 4 link engines were approximately the same size as the whole CPU.The T400 was intended to be used as a core in what were then called "systems on silicon" (SOS) devices, now termed and better known as "system on a chip" (SoC).