Abstract: A hydrodynamic seal efficiently protects an interior cavity of an enclosure from external elements. The seal has an upper portion having a recess formed in a center section of the upper portion. A lower portion, having a raised portion, abuts the upper portion and forms a passage between the two portions. The passage between the upper and lower portions is reduced in area along the recessed and raised portions. When air with water and/or dust passes through the passage, a velocity and pressure change occurs, thereby the water and/or dust is deposited in a channel. The water and/or dust flows along the channel and is exhausted to an external so that the water and/or dust is prevented from entering the interior cavity of the enclosure.

Abstract: Disclosed is a connector module which protects adjacent contacts from being shorted by condensation. Ridges are provided on a housing adjacent each contact such that water droplets of a sufficient width to bridge the distances between contacts cannot form.

Abstract: Disclosed is a cross-connect system, such as a feeder distribution interface for telecommunications. User and feeder wires are each coupled to two sides of the matrix in order to provide flexibility in the electrical path. The switches, which are of the double-pole, double-throw variety, are employed at selected crosspoints of the switch matrix in such a manner as to reduce the number of switches required.