Abstract: A stack position determination circuit in a stackable repeater is disclosed that includes an input connector, an output connector, an initial pin driving circuit, and a pin rotating circuit. The input connector includes a plurality of input connector repeater stack position pins arranged in an hierarchical order so that each input connector repeater stack position pin corresponds to a possible physical position of the repeater in a stack of repeaters. An output connector includes a plurality of output connector repeater stack position pins arranged in an hierarchical order so that each output connector repeater stack position pin corresponds to a possible position of the repeater in a stack of repeaters. An initial pin driving circuit is connected to an initial pin in the input connector repeater stack position pin hierarchical order. The initial pin corresponds to a first position in the stack of repeaters and the initial pin driving circuit is responsive to an initial repeater signal.

Abstract: A data transfer rate control method inserts a stuff packet in real time to resolve the problem present in an ATM transmission for MPEG data. The method, for controlling a data transfer rate at which coded data are transferred in an asynchronous transfer mode may include the steps of: forming the coded data for an AAL layer (ATM Adaptation Layer); calculating an insertion timing for insertion of a NULL packet; inserting the NULL packet into the coded data of the AAL layer in consonance with the insertion timing, obtained by the calculation, for the NULL packet; and transferring, in the asynchronous transfer mode, the coded data of the AAL layer into which the NULL packet is inserted.

Abstract: A shaper (1) in a stream of data packets provides for compliance with the agreements about the packet traffic of each virtual connection. It contains means (11) for the intermediate storage and read-out of data packets and for extracting the packet clock, furthermore a control (12) which reads the packets of the different connections into the data stream at the right time. The selection of the data packet takes place on the basis of a rank which is established for each data packet located at the front of the virtual waiting line of the individual connection. With each packet clock the rank is incremented in accordance with the agreed bandwidth for this connection; thus, for each clock a new calculation for the highest two connections for which a data packet advances again to the head of the virtual waiting line, is sufficient. Two processing units (21, 24) are provided.

Abstract: A method and apparatus for use in a packet radio system is provided wherein a time for providing a plurality of users of the system with acknowledgement data appertaining to successful transmission of packets of data bearing radio signals is large in comparison with a rate of demand for communication of data, and wherein authorisation for transmission of packets is based on an estimate of a number of active users. The method and apparatus provides the users with an estimate of the number active users, calculated in accordance with an average number of acknowledgements received during a predetermined time.

Abstract: A method of a mobile radio system for synchronization a transmitter and receiver. The system relates to MC/DS-CDMA-system. In the system information is transmitted digitally in frames. For that purpose a data channel, a pilot channel and a synchronization channel are created. In the data channel the data blocks D0, D1, D2 etc are separated by a guard space .DELTA.. In the pilot channel, respective the synchronization channel, the information is arranged in blocks which are synchronous with each other. The repeating distance, A, of the pilot channel, corresponds to the length of one of the data blocks D0, D1, D2 etc. The repeating distance for the synchronization channel is S, corresponding to a number of blocks in the data channel. In the synchronization channel information is introduced into the blocks which indicates their relation to the data channel.

Abstract: The present invention allows telephone subscriber loops carrying data traffic between computer systems to be switched to an alternative connection through a data network, thereby unloading data traffic from the telephone network. The invention operates by means of a break switch, which selectively switches a plurality of subscriber loops between a central office switching system and a data network. The break switch is coupled to a concentrator which takes a plurality of inputs from the break switch and connects them to a smaller number of modems in a modem pool. The concentrator allows a subscriber line to connect to different types of modems within the modem pool, depending upon requirements of a particular subscriber line user. The modem pool connects through a network interface to a packet-switched network, such as the Internet. A number of different methods can be used to transmit a command to switch a subscriber loop from the central office switching system to the packet-switched network.

Abstract: The specification relates to a broadband multiple access protocol for bi-directional hybrid fiber/coax (HFC) networks and other shared media networks. The protocol supports downstream broadcast transmission from headend to cable modem, and also provides for allocation of bandwidth for cable modems to transmit back to the headend. The HE transmits and receives control messages in either ATM or VL format, depending upon CM capability, the determination of CM capability ascertained by the HE during the message flows interchanged between HE and CM while establishing a data link. Although the present invention is described in relation to an HFC network, it is also equally applicable to other shared media networks. The protocol supports different data access modes such as STM, ATM, and VL; within each subframe of a subframe/frame/masterframe structure.

Abstract: A method and apparatus for reasonably discriminating between an appropriately behaved wireless terminal and an inappropriately behaved wireless terminal is disclosed. In particular, some embodiments of the present invention are capable of reasonably discriminating between an appropriately behaved wireless terminal and an inappropriately behaved wireless terminal even though consecutive frames have heterogeneous rates (i.e., full-rate frames, half-rate frames, quarter-rate frames, etc.).An illustrative embodiment of the present invention receives a frame from a wireless terminal and determines how many "gated-on" groups are in the frame. The illustrative embodiment next determines how many power-down commands should be issued or have been issued to the wireless terminal in response to the received frame. Next, the illustrative embodiment compares the number of power-down commands for the frame to the number of gated-on groups for the frame.

Abstract: A digital mobile communication system has a high-speed non-transparent data connection between a transmitting and a receiving party (MS, TAF). For the data connection, parallel subchannels (ch1-chn), corresponding in number to the nominal data transfer rate, have been allocated on the radio interface. A radio link protocol (RLP) is responsible for transmitting data over the radio interface, and for acknowledging correct data frames and for retransmitting defective data frames. A transmission buffer (63) buffers the data frames to be transmitted and stores the data frames transmitted until it receives an acknowledgement of successful reception. In order to reduce interference and power consumption, user data is transmitted by using as many of the allocated subchannels as required by the actual user data rate at any one time. On the other allocated subchannels, transmission is interrupted or discontinuous transmission is activated.

Abstract: An ATM reference traffic system records packet information representative of ATM packets transmitted over an ATM network. The system also creates and transmits ATM packets from packet information on a schedule representative of ATM packet transmission over an ATM network. The preferred system uses a personal computer with the operating system modified to schedule events with microsecond resolution while providing interrupts to the operating system on a periodic basis.

Abstract: A method and system for detecting collision of transmitted signals in a random-access, multiple-path communication system utilizes a packet coding arrangement where a transmitting transceiver terminal assembles a plurality of packets into a coded transmit block. Each transmit block is coded with an error detection code, or assigned time slots, so that a routing controller will discard an entire transmit block if any of the packets are not properly decoded. Each transmit block further includes a self-addressed packet, wherein receipt of the self-addressed packet by the transmitting terminal indicates that no collision has occurred. Thus, the present invention does not require any additional circuitry or control of the routing controller, nor transmission of an acknowledgement signal in order to detect collision of transmitted signals.

Abstract: An unsigned integer comparator for use when comparing an n-bit received signal (such as an address) with an n-bit known signal ("comparison address"). The first stage of the comparator may be configured in advance, since the values of both a "comparison signal" and a "select signal" are known a priori. When the "current signal" arrives, the bits of this signal are then compared against the associated bits of the comparison signal. Subsequent stages of the comparator perform comparison operations of increasing length, dependent upon the outcome of the previous stage (i.e., a first set of 2-bit comparisons, then 4-bit, 8-bit, etc.), until the entire n-bit integers are ultimately compared and a final output is generated.

Abstract: An idle address controller for a shared buffer type ATM switch controls the addresses of output cells in a common memory to be stored directly in an idle address buffer without passing through the conventional idle address delay controller, by improving the idle address control scheme of a unit switch. The idle address controller includes an idle address control signal generator for generating idle address control signals based on the buffer length information from counters, idle address control signal buffers for storing the idle address control signals, and an idle address control signal multiplexer. Therefore, the idle addresses can be efficiently provided, and this mechanism lowers cell loss and reduces required memory capacity.

Abstract: A routing procedure is provided to operate in conjunction with a CCS7 telecommunication network that has been upgraded to accommodate messages having signalling link selection (SLS) field that has been expanded from a length of 5 bits to a length of 8 bits. Messages containing an SLS field with a length of 5 bits that are received at upgraded nodes in such a network are converted to 8 bits so as to take advantage of the increased traffic capacity and improved load sharing characteristics offered by upgraded nodes. The Origination Point Code field, and the Destination Point Code (DPC) field in the routing label of a message, as well as the link identification number of the incoming signalling link carrying the message are used to generate an 8 bit SLS code that maintains message sequencing and is uniformly distributed among available SLS codes.