A mounting zone and a reflow zone are arranged in parallel between a loader and an unloader, and mounting and reflow processes are performed simultaneously. The support arms have an engaged positioned which is disposed beneath a platen and a retractable position displaced vertically away from the platen and rotated away from the platen in a direction parallel to a planar surface thereof. In another embodiment, orthogonally polarized tracking channel components of an incident signal are processed to make a determination as to which of the orthogonally polarized tracking channel components is stronger, and this determination is used to select a polarization of a data channel to reduce a polarization mismatch loss. The system also detects failure of the primary tunnel during the call and performs failover by changing a data path during the call to transmit packets over at least one non-failed tunnel.