Abstract: A board to board connector may include: a first shell coupled to a first board, and including a protruding extension part extended upward in a longitudinal direction and having one end protruding in a radial direction; and a second shell including an elastic rotating part extended downward in the longitudinal direction toward between a cover part and the protruding extension part, and having one end protruding in the radial direction so as to be engaged with and fixed to the protruding extension part. The elastic rotating part may be spaced apart from the cover part, made of an elastic material, and rotatable from side to side in a movement space formed between the elastic rotating part and the cover part.

Abstract: A board to board connector may include: a first shell coupled to a first board, and including a protruding extension part extended upward in a longitudinal direction and having one end protruding in a radial direction; and a second shell including an elastic rotating part extended downward in the longitudinal direction toward between a cover part and the protruding extension part, and having one end protruding in the radial direction so as to be engaged with and fixed to the protruding extension part. The elastic rotating part may be spaced apart from the cover part, made of an elastic material, and rotatable from side to side in a movement space formed between the elastic rotating part and the cover part.

Abstract: A method and apparatus are disclosed for detecting a fault in a transceiver of a base transceiver system. In the transceiver having a down converter, a microprocessor reads a predetermined first minimum value and a predetermined first maximum value of received input signal levels, measures an instantaneous control voltage generated from an automatic gain controller (AGC) and converts the measured instantaneous AGC control voltage into a received input signal level. When the converted received input signal level is below the predetermined first minimum value, the microprocessor determines that a fault exists in the amplifier operation of the down converter. Similarly, when the received input signal level exceeds the predetermined first maximum value, the microprocessor determines that a fault exists in the amplifier operation of the down converter.

Abstract: An apparatus and method for generating a pilot signal for hard hand-off. A pilot signal generator of a base station for generating an identifying pilot signal corresponding to a target base station to perform inter-frequency hard hand-off in the code division multiple access cellular system comprises an intermediate frequency amplifier/divider, a service RF path unit and a RF path unit. The IF amplifier/divider divides the amplified IF signal transferred from a digital MODEM. The service RF path unit up-converts a first portion of the divided signal into a desired radio frequency and transmits the up-converted RF signal for actual communication and the RF path unit up-converts a second portion of the divided signal into a desired RF and transmits the up-converted RF signal as an identifying pilot signal corresponding to a target base station for a hard hand-off.

Abstract: An apparatus and methods for tracking a power level of a signal received at a base station of a code division multiple access (CDMA) digital cellular communication system. The apparatus comprises a storage unit for storing a first table comprising automatic gain control voltages corresponding to a series of received signal levels and a second table comprising variable attenuation control voltages corresponding to the automatic gain control voltages.