Abstract: An ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a reference unit. In each of the units, a repetitive series of pulses is generated, each having a repetition rate directly related to the respective distance between an electroacoustic transmitter and an electroacoustic receiver. The pulse trains are provided to respective counters, and the ratio of the counter outputs is utilized to determine the distance being measured.

Abstract: An electrical connector comprises, an insulative housing block (2), electrical contacts (4) held by the housing block (2), spring fingers (11) on each of the contacts (4) for gripping onto a conductive pin, cavities (6) in an insulating housing (5) for receiving the fingers (11), mouths (19) opening into the cavities (6) for receiving conductive pins to be gripped by the spring fingers (11), rails (21) in the cavities (6), each of the rails (6) being in between said spring fingers (11) of one of the contacts (4), and each of the rails (21) being aligned with a mouth (19) of one of the cavities (4) and positioning said spring fingers (11) in alignment laterally with respect to the mouth (19) to assure receipt of a conductive pin between said spring fingers (11).

Abstract: A cable management system which provides routing of wired services between service lines (16) and user lines (18). Each service line enters the cable system at a service termination unit circuit card (22) which also holds a portion of a crosspoint switch matrix (126). Each user line enters the system at a line termination unit circuit card (20). The service termination unit circuit cards are all mounted to connectors (36) on a first side of a centerplane board (24) and the line termination unit circuit cards are mounted to connectors (36) on the other side of the centerplane board. Pins (37) extending through the centerplane board interconnect the connectors so that any service line can be connected to any user line. A system controller card (26) mounted to the centerplane board communicates with the circuit cards via a bus (38) on the centerplane board.