Abstract: A telephone service system in an ATM private network, includes: a PSTN interface unit for performing PCM with an analog telephone signal transmitted from a channel in a PSTN, converting the modulated data into a CEPT frame before sending it to a subscriber, performing the PCM with CEPT frame data, from a subscriber, and converting the modulated data into an analog telephone signal, before forwarding it to the PSTN; a first ATM cell processing unit for converting the CEPT frame data from the PSTN interface unit into an ATM cell, converting an ATM cell from a subscriber into CEPT frame data, and sending it to the PSTN interface unit; an ATM switching unit for switching the ATM cell from the first ATM processing unit to the subscriber, and switching the ATM cell from the subscriber to the PSTN; a second ATM processing unit for converting the ATM cell from the ATM switching unit into CEPT frame data before sending it to the subscriber, and converting the CEPT frame data from the subscriber into an ATM cell before

Abstract: An intelligent network congestion control system includes a reception message counting section, a comparing section, an SSP capacity storage section, a message destination selecting section, and a regulation instructing section. The reception message counting section measures the rate of occurrence of all service requests generated by electronic exchanges. The comparing section checks at predetermined periods whether the rate of occurrence measured by the reception message counting section exceeds a predetermined allowable value. The SSP capacity storage section stores weight data on the respective electronic exchanges. The message destination selecting section selects an electronic exchange as a destination of a message on the basis of at least the weight data read out from the SSP capacity storage section when the comparing section determines that the rate of occurrence exceeds the allowable value.

Abstract: 052440872 An existing synchronous residual time stamp (SRTS) algorithm (76, 78, 80, 82, 106, 104) is used in conjunction with adaptively filtered buffer fill information (74) to reconstruct an original constant bit rate (CBR) payload clock rate (102) for asynchronous transfer mode (ATM) CBR payloads (88, 96). The SRTS time stamp (96) is used as the primary factor used to recover the payload clock rate, but a secondary payload frequency correction factor (112) is generated by filtering (118, 120) the desynchronizer buffer fill position. This correction factor is determined as part of a feedback arrangement which adaptively (128) alters the filtering time constant based on the offset position of the buffer from its center. In this way, payload clock frequency (102) is corrected, even in the presence of loss of synchronization PRS traceability between mapping and desynchronizer nodes to keep the desynchronizer buffer from overflowing.

Abstract: A vehicle navigation system with a security feature capable of detecting that the system has been removed from the vehicle, which uses only one memory for storing an anti-theft code. The navigation system is provided with a GPS receiver containing a clock outputting a time synchronized with present GPS time information, while receiving electric power from the vehicle battery, and returns the time to an initial preset time when not receiving power from the battery, and detects a present position of the vehicle by means of the present GPS time and position information. A CPU detects whether or not the time of the clock has returned to the initial time, an SRAM stores a preset identification code, and a controller requests input of an identification code when the CPU detects that the time of the clock has returned to the initial time, and compares the input identification code to the identification code stored in the SRAM, and operates in accordance with the result of the comparison.

Abstract: A transponder communication device has an interrogation signal generator for generating an interrogation signal, a transmitter for transmitting the interrogation signal to a number of transponders, and a receiver for receiving answers signal from transponders. A transponder has an interrogation signal detector, an answer signal generator, and a state setting controller for setting a state of the transponder. The transponder communication device selects a single transponder from the number of transponders. First, the transponder communication device transmits an initial interrogation signal is transmitted to all transponders when the transponders are in an active state. In dependence of answer signals received from the transponders, the transponder communication device transmits a standby setting signal to at least one transponder at a time to instruct the transponders to adopt a standby state. In the standby state the transponders wait until a single other transponders has been selected.

Abstract: A video multiplexer is disclosed which incorporates a dynamic rate control feature. MPEG encoded video signals for each channel are stored in a first-in first-out (FIFO) buffer. A packetizer for each channel detects the level in the FIFO buffer and issues a request signal to the video multiplexer that the channel desires to transmit the video signals on the network. The bandwidth allocation for a channel is either preselected by the video provider or automatically selected, and tokens are issued by a counter associated with each channel to give greater network access to those channels which require a higher bandwidth. A token multiplier detects the bandwidth needs of the various channels by detecting the rate that the FIFO buffer is being filled and automatically multiplies the number of consecutive packets which the packetizer may transmit over the multiplexer during a single grant.

Abstract: A BRM changing circuit 4 that changes congestion information of a BRM cell is disposed on the output side of a down line (from the network side to the user side) of a cell rate supervising apparatus. The BRM changing circuit 4 places an ACR value calculated by an ACR calculating circuit 3 with congestion information (a CI bit, an NI bit, and an ER area) in a BRM cell received from the network through the down line to the ER area of the BRM cell. The resultant BRM cell that has been changed by the BRM changing circuit 4 is sent to the user side terminal unit through the down line.

Abstract: Power control apparatus and an associated method for a transmitting station operable in a TDMA communication system. The transmitting station includes transmitter branches for communicating communication signal bursts during selected time slots. Communication signal bursts transmitted upon adjacent time slots partially overlap so that a receiving station is able to extract information from a communication signal burst transmitted upon an adjacent time slot.

Abstract: A home area network system and method uses existing plain old telephone system (POTS) wiring to network computers in a home without disrupting conventional telephone services. The home area network assigns a network address to each computer coupled to the network and communicates using a broadband communication method occupying the portion of the spectrum above the baseband portion used by ordinary telephone service. The home area network employs quadrature phase shift keying (QPSK) modulation on unshielded twisted pair (UTP) wiring arranged in an arbitrary topology. The home area network additionally employs adaptive equalization for each computer pair coupling as well as adaptive error correction.

Abstract: A telecommunications network (10) for providing intelligent network services includes a distributed switching system (19) having a call control computing platform (12) coupled to a digital loop carrier (16), where the digital loop carrier (16) is coupled to a plurality of customer premises equipment (18). A local switch (30) is coupled to the digital loop carrier (16), and at least one service control point (40, 42) is coupled to the call control computing platform (12) and the local switch (30). The at least one service control point (40, 42) contains service definitions and logic of both legacy services and intelligent network services.

Abstract: A method of adding time information to a data stream is provided. First and second timing sequences are linked with the data stream. The first timing sequence provides a permanent time record of when the data in the stream first originated. The second timing sequence is re-writable when the data stream is altered, for example by editing, so as to ensure an internally consistent time track is provided each time the data stream is changed. The timing sequences are derived from absolute references such as Global Positioning System (GPS) Time. The first and second timing sequences may be stored separately to the data stream. Two or more sets of second timing sequences may be provided, corresponding to different presentations of common sets of data streams.

Abstract: A data communication system employs a method (400) for transmitting packetized data (100) using a combination of well known transmission techniques, such as TCP/IP and a novel compression process. A message type identifier (300) for the packet to be transmitted is first identified, which identifier comprises a packet type identifier (113) and a protocol identifier (114). The packet type identifier (113) distinguishes between control information and user information in the data packet. The packet is then selectively encoded (407, 411) using either a first or a second header compression technique, depending on the packet type identifier (113) and the protocol identifier (114). In this manner, an improved packet transmission scheme is envisaged, which gives a reliable solution for data transmission in a noisy RF environment and/or a bandwidth-limited environment.

Abstract: A system for establishing a restoral route to bypass multiple failed components in a communications network. The network has components that include nodes and links. Each link connected to a node is either an input or an output link for that node. When a component failure is detected on a output link of a node, the system selects a source node and a target node for the restoral route and effects the sending of messages through an output links of the source node to establish a restoral route to the target node. When a message to establish a restoral route to the target node is received at a node, the node forwards the message through its output links. When a message that a restoral route has been established to the target node is received through an output link of a node, the node connects the input link through which the message to establish a restoral route was received to the output link and forwards the message that a restoral route has been established through the input link.