An edge switch of a packet-based communication network, the edge switch having a port to which a specified user is connected is identified. A first barrier is adjacent the semiconductor contact; a second barrier layer is between the first barrier layer and the absorber layer. The thread tension releasing device presses the release extension portion of the thread press member to pivot the thread press member so as to move the thread clamping portion of the thread press member. Etchants used in processes of the present invention comprise a carrier gas, one or more C2+F gases, CH2F2, and a gas selected from the group consisting of CHF3, CF4, and mixtures thereof.