Abstract: A rail flaw detector is configured for locating flaws in rails of a railroad track and for use with a vehicle travelling on the railroad track. The detector includes at least one signal applicator configured for applying ultrasonic signals to the rail and for receiving return signals; a mechanical subsystem connected to the applicator and to the vehicle and configured for maintaining the at least one signal applicator in operational position on the track. A human-machine interface is connected to the at least one signal applicator, is configured to control the detector and to monitor sensed rail condition. In one embodiment, the human-machine interface includes a schematic display of the rail being monitored and at least one touch screen control for controlling the mechanical subsystem and the at least one signal applicator.

Abstract: A rail flaw detector is configured for locating flaws in rails of a railroad track and for use with a vehicle travelling on the railroad track. The detector includes at least one signal applicator configured for applying ultrasonic signals to the rail and for receiving return signals; a mechanical subsystem connected to the applicator and to the vehicle and configured for maintaining the at least one signal applicator in operational position on the track. A human-machine interface is connected to the at least one signal applicator, is configured to control the detector and to monitor sensed rail condition. In one embodiment, the human-machine interface includes a schematic display of the rail being monitored and at least one touch screen control for controlling the mechanical subsystem and the at least one signal applicator.

Abstract: A communications switching module (CSM) serving as common switching equipment for work stations in a star-topology Ethernet local area network. Both voice and data are incorporated in master Ethernet packets which are transmitted at a constant rate. The CSM switches the voice signals synchronously over a time domain multiplexed highway and separately switches the data signals asynchronously over a high speed packet bus.

Abstract: A local area network of devices connected to a Communication Switching Module (CSM) carry both delay-sensitive information and non-delay sensitive user data in master Ethernet packets transmitted over the LAN at a constant rate. Signaling and control information from the devices initialize a permanent virtual connection (PVC) between devices and the CSM. The signaling and control information is contained in standard Ethernet packets which are encapsulated along with non-delay sensitive data in the master Ethernet packets and performs various control functions for the LAN devices and the CSM.

Abstract: Delay-sensitive information (e.g., voice, video) and non-delay-sensitive user data are combined and transmitted over a single UTP cable forming part of a star-connected Ethernet local area network. Master Ethernet packets of fixed length are formatted with fixed length portions assigned to the two types of information and transmitted at a constant fixed rate. The delay sensitive information is extracted, switched and transmitted at a constant bit rate. The non-delay sensitive information is segmented and transmitted asynchronously in a user data portion of the Master Ethernet Packet.

Abstract: A permanent virtual connection (PVC) is automatically set up over an Ethernet local area network (LAN) link between a work station device having a digital telephone and a Communications Switching Module (CSM) when the device is first connected to the LAN. The PVC is established by exchange of information in standard Ethernet packets between the device and the CSM. Automatic reservation of a full duplex PVC for digital telephone signaling and control information enables set up and break down of voice channels within the same PVC by exchange of signaling information in standard Ethernet packets.

Abstract: An Ethernet Local Area Network uses a star topology connecting user stations to a Communications Switching Module (CSM) with 10Base-T or 100 Base-TX UTP cable. Each user station typically has a digital telephone and a data communication device, such as a PC communicating with the CSM through a common UTE adapter. Delay-sensitive digital voice signals and non-delay sensitive user data are transported in master Ethernet packets of fixed length transmitted at a fixed rate. Segmentation and re-assembly of data is performed in the UTE adapters and in the CSM.

Abstract: An apparatus for indicating to a central service unit of a telephone system having a central service unit coupled to a plurality of station sets whether a particular station set comprises a speakerphone and the type of speakerphone from among two types of speakerphone, is disclosed. The station set includes a microprocessor controller having an input line coupled to a selected one of a low or high logic level. The input line is connected to an electronic switch which receives interrogation signals from the central service unit. Depending on the logic level to which the input line is coupled and the state of the switch, the central service unit can determine whether the station set comprises a speakerphone and the type of speakerphone.