A chip is bonded on a circuit board by aligning in position bumps with board electrodes with interposition of an anisotropic conductive layer between the chip and the circuit board. A precision constrained Gaussian model based handwriting classifier is trained by estimating parameters for the PCGM under minimum classification error criterion, such as by using a computer-based processor. When an edge device becomes disconnected from one trunk switch, but is still connected to another trunk switch, the trunk switch from which it has become disconnected transfers the data destined for the disconnected edge device to the intra cluster port which then transfers that data to another trunk switch.