Isolating signaling environments in a power line communication system involves the use of a filter to block power line data signals from entering andor leaving a signaling environment while allowing power signals to pass to or from the signaling environment. A lever 2 is provided in rotatable and linearly movable manners on the first connector housing 1. The application interface can also be displayed on a second display that is integrated in a second housing of the dual-display mobile computer device. The studs may be rotatable around the axis, and the slot is positioned such that, when the blade is in the open position, the post may be moved toward the locking position until a face of the stud engages a locking surface of the handle, thereby locking the blade in the open position. A method for wireless relay network communications includes determining performance information regarding a plurality of relay nodes, allocating resource blocks in a subframe to relay nodes based on the information, and notifying relay nodes of the allocated RBs using a signaling message. The conic section may be y=Nx, in which case the integer solutions provide a factorization into integers of N.