Abstract: A Performance Report Message or other message is received from a first device at a second device. The received message is revised such that a value of a Terminal Endpoint Identifier field in the message is revised according to a predetermined transformation, e.g., by incrementing the value in the Terminal Endpoint Identifier field. The revised message is then transmitted from the second device to a third device. The first, second and third devices may comprise devices of a wireless communications network, such as radio heads and/or a control part (COP). The message is preferably received over a first T1 link connecting the first and second devices, and the revised message is preferably transmitted over a second T1 link connecting the second and third devices.

Abstract: A scheme of identifying nonfunctional two-way radios from among a known group of two-way radios expected to be operating within a region may include establishing a corresponding window of time for each of the two-way radios expected to be operating within the region. For each of the established windows of time, a transmission from the corresponding radio is awaited. If, for a particular radio, no transmission is detected within its corresponding window of time, the absence of the transmission is recorded. Finally, if, for a particular radio, the number of times absence of transmission has been recorded exceeds a threshold, the particular radio is identified as nonfunctional.

Abstract: An apparatus and method for aligning the antennas of two transceivers of a point-to-point wireless millimeter wave communications link. A narrow band oscillator power source is substituted for the signal transmitting electronics associated with a first antenna and a power detector is substituted for the signal receiving electronics associated with a second antenna. In preferred embodiments after a first alignment procedure is performed, the procedure is repeated with an oscillator power source connected to the second antenna and a power detector connected to the first antenna. In other preferred embodiments the antennas are pre-aligned using a signaling mirror or a narrow beam search light or laser. After the antennas are aligned the transceiver electronics are reconnected. In preferred embodiments the communication link operates within the 92 to 95 GHz portion of the millimeter spectrum and provides data transmission rates in excess of 155 Mbps.

Abstract: Communication nodes for use with a wireless ad-hoc communication network are disclosed. In an embodiment of the present invention, the communication node comprises a transducer, which generates a signal in response to an external signal. The ad-hoc network communication is supported in part by static communication nodes, which defined an organized infrastructure network in order to achieve the various functions of the transducers. In another embodiment, the communication node for use with a wireless ad-hoc network does not include a transducer. Such communication nodes are preferred for use with a less structured network with virtually no infrastructure and allow for being used with expanding and contracting networks. Mobile communication nodes mostly support the propagation of signals. However, pseudo-static or static communication nodes are also used in wireless communication ad-hoc networks.

Abstract: The present invention is directed to method and apparatus for detecting base station (BS) transceivers malfunctions in a cellular telecommunications system. A Transceiver Malfunction Detector (TMD) receives and stores information related to the service performance of the BS transceivers and sorts the information on a per transceiver basis, for generating a service quality value for each transceiver. The TMD computes a service quality threshold value proportional to the average performance of the BS transceivers, and compares the service quality value of each monitored transceiver with the threshold, for determining the acceptability of the transceiver performance. The TMD also detects the cause of a malfunction in a transceiver, by assigning the frequencies used by an adequate transceiver to a transceiver suspected to be malfunctioning and by further monitoring the activity of the initially malfunctioning transceiver.

Abstract: First and second supervised cards 103 and 104 are respectively provided with bus registers 114 and 115, CPUs 116 and 117 detect occurrence of a state change or failure of the respective apparatuses, the detected state change or failure information is stored in bus registers 114 and 115, and CPU 110 of currently used supervising card 101, alternately set to be used or reserved, reads the stored state change or failure information through supervisory control bus 105, and thereby supervises first and second supervised cards 103 and 104.

Abstract: A method and apparatus for controlling and maintaining a tower top low noise amplifier (TTL) module coupled to an antenna, where the TTL module includes a plurality of TTLs, each for amplifying signals received by the antenna on an associated cell sector. The method includes: reading alarm information concerning alarm conditions present in the TTL module during a read mode; and, writing commands to control circuitry coupled to the TTL module in a write mode to control switching states of bypass switches therein in response to the alarm information.

Abstract: A method for measuring the EIRP (Effective Isotropic Radiated Power) of a satellite downlink carrier signal is performed by or under the control of a processor located, for example, at a technical operations center of a satellite communications company. The processor operates in accordance with a computer program which automatically identifies a carrier frequency corresponding to a customer, measures a level and bandwidth of the downlink signal at the customer carrier frequency, determines a level of a reference carrier signal, compares the level of the downlink signal to the level of the reference carrier signal, and determines EIRP power of the downlink signal based on the comparing step. The measured EIRP value is then compared to an EIRP value contractually assigned to the customer, and the difference determines the manner in which the measured EIRP value deviates from the assigned power.

Abstract: A radio repeater device, which can mutually communicate by relay of a vehicular terminal with a base station, comprises a first antenna to communicate with the base station, a second antenna to communicate with the vehicular terminal, and a repeater section which is connected with the first antenna and the second antenna, and to relay the base station and the vehicular terminal to be able to communicate therebetween, and, when the first antenna receives the signal from the vehicular terminal, an operation of at least the repeater section is stopped.

Abstract: A communications interface adapter facilitates both wired and wireless communications between crew members of a vehicle having a wired intercom and has an intercom communications circuit having an input/output port for providing electrical communication between the interface adapter and the wired intercom and also has a fixed radio transceiver. The fixed radio transceiver comprises a receive circuit for receiving radio communications and for communicating the received radio communications via the intercom communications circuit to the wired intercom of the vehicle and a transmit circuit for transmitting communications received via the intercom communication circuit from the wired intercom of the vehicle.

Abstract: An SMR repeater is made agile by adding a microprocessor controlled frequency selection circuit to enable the repeater to operate on any one of several available frequencies in a band. For dispatch service, the output of the repeater is switched to a power amplifier feeding an omni-directional antenna. The repeater scans several frequencies sequentially. If a signal is detected, scanning is halted to provide repeater service, after which scanning is resumed. The frequency agile repeater is coupled to an antenna system having a narrow beam which can be steered electronically. A control computer scans the azimuth of the beam. The computer divides a service area into a plurality of cells extending radially from the antenna system and assigns channels as needed to service a subscriber. More than one cell can be on the same frequency without interference.

Abstract: In a satellite network with on-board switching and bandwidth on demand, traffic monitoring is required to facilitate billing data collection and to avoid congestion at the satellite. In addition to traffic monitoring, performance monitoring is necessary to quickly respond to link degradation or possible equipment anomalies. Monitoring terminals specially equipped with traffic measuring and policing and link performance measuring capabilities are used to monitor traffic and performance. The monitoring terminal is located in each satellite beam to perform the monitoring functions for that beam. The monitoring terminals are low-cost terminals that receive down-link traffic in their respective beam, and record statistics on a per transmit-terminal or per virtual connection basis. Records are periodically transmitted to a central location where they are processed for billing, enforcing traffic contracts, and taking actions against link degradations.

Abstract: The present invention relates to preventing inconsistency between the data maintained in a master exchange and a backup exchange in a telecommunication system. To ensure a reliable data distribution, the system maintains a copy of the master exchange data in a slave exchange. When the slave exchange receives data from the master exchange or the backup exchange, the received data or the corresponding data previously stored in the slave exchange is selected for use on the basis of comparison of the information included in their update information. That is, the data stored in the slave exchange is sent to the exchange having sent the received data if the data stored in the slave exchange is selected for use; the received data is sent to the master exchange if the data received from the backup exchange is selected for use; and the received data is stored in the slave exchange if the received data is selected for use.

Abstract: A wireless communication service network includes a message processing system with at least two programmable application processors (APs) providing operational, administrative and maintenance support for one or more cell base stations in the network serving one or more wireless radio units. Improved control of the AP message processing resources is provided in response to an AP shutdown condition. In accordance with the improvement, an initial overload control (OLC) threshold is set for the APs, and the APs are monitored during their operation as they perform message processing. In the event that one of the APs becomes non-operational (non-operating AP), the OLC threshold relative to one or more remaining operational APs is dynamically increased.

Abstract: A method for handling an alarm that occurs when an administrator changes channel cards in a digital cellular system.

Abstract: Method and apparatus for performance characterization of Ka band transponders wherein measurements are made. A wideband modulated data signal is used to test the response of the Ka band transponder. A periodic test pattern, preferably a pseudo-noise (PN) sequence, modulated on a carrier, is transmitted to an onboard satellite transponder which then retransmits the signal to a receiver where a down converter is used to output inphase and quadrature phase baseband signals which are digitized and used for measuring one or more of the following: Magnitude and phase response AM/AM and AM/PM Phase noise Bit error rate Data asymmetry I/Q channel imbalance.

Abstract: A telecommunications network architecture and method of providing failover operations between mobile switching centers (MSCs). A plurality of MSCs and at least one base station controller (BSC) are connected to an Internet Protocol (IP) network in which transmission paths and control paths are logically separated. The BSC reports to a primary MSC and includes an alternative MSC list identifying at least one backup MSC for the primary MSC. The BSC determines when the primary MSC has failed, and utilizes a control path in the IP network to notify the backup MSC that the BSC has switched its reporting to the backup MSC. The BSC also utilizes a transmission path in the IP network to send mobile station communications from the BSC to the backup MSC. Mobile station location updating requests are sent from the backup MSC to a home location register (HLR). The requests include a new element that informs the HLR that the backup MSC is now serving the mobile station due to a failure of the primary MSC.

Abstract: Each time a mobile terminal enters a service area of an information providing device and its location is registered by the information providing device, the area code and local code of telephone numbers and addresses associated with the service area are sent from the information providing device to the mobile terminal. Based on the area and local codes of telephone numbers and the addresses, the terminal retrieves the telephone numbers, names and addresses of acquaintances residing within the service area from an address book stored in its RAM and visually displays them with a notification sound. Thus, the user at the terminal can know access information for acquaintances residing within each service area each time the user enters the service area.

Abstract: Emergency call handling may, in the near future, require terminal unit location information to be provided to emergency service centers. Independent or quasi-independent systems, sometimes referred to as adjunct systems, can be provided to monitor remote unit transmissions and derive location information for mobile units making emergency access therefrom. Techniques for determining which channels each adjunct receive shall monitor are described herein, as well as specific monitoring techniques. Moreover, the adjunct system can use the received information to provide a second speech path to an emergency service center.

Abstract: A monitoring and command system for use in a wireless communications system including remotely located transceivers for transmitting and receiving telephony signals to and from wireless telephones wherein each of the remote transceivers is connected to a broadband distribution network. A central location includes remote antenna signal processors connected to the broadband distribution network and a control unit is connected to the remote antenna signal processor, and the monitoring and command system controls operations of the remote antenna signal processors and the remote transceivers. The control unit exchanges control and monitoring messages with the remote antenna signal processors, and each exchange of messages comprises a completed exchange of messages with one remote antenna signal processor before initiation of an exchange of messages with another remote antenna signal processor.

Abstract: The invention relates to a cellular radio system comprising a mobile exchange, a first base station communicating with the mobile exchange through a data connection, said base station comprising at least a first transceiver unit for establishing a connection to the mobile stations on one or more channels allocated to it for transmitting telecommunications signals between the mobile stations and the mobile exchange, and control means for controlling the first transceiver unit. In order to save available resources, the control means comprise means for deactivating the first transceiver unit when the traffic capacity need is small in the coverage area of the first base station.

Abstract: There is described a system and method for locating, and optionally monitoring the status of, a mobile entity in a given area fitted with a radio beacon. In one embodiment, the system features a network of bi-directional radio beacons which transmit on the same frequency at random intervals. A method for processing and relaying unique message identifiers throughout the system is disclosed which allows the vicinity of the mobile entity to be determined from any beacon in the network.

Abstract: The present invention provides an economic optical conversion relay amplification system avoiding a beat noise in an uplink line of an optical transmission line of multibranching and multinode multiplexing type.

Abstract: An advanced thermal container has a thermally insulated open receptacle, a thermally insulated closure member, a data monitoring system incorporated into the container that can send and receive information via wireless communication, and a sealing system to minimize heat transfer and air exchange between the interior and exterior of the container. Hard plastic casing enclosing foam-encased vacuum insulation panels is used to construct the insulated receptacle and closure member. The closure member and receptacle each have an elongated portion with shoulders above and below the elongated portion. When the container is closed, a lower seal and an upper seal are compressed between the mating lower and upper shoulders, respectively. The onboard data monitoring system records important parameters concerning the internal and external environments of the container, particularly temperature information, as well as other significant events such as the number of times the container was opened during transit.

Abstract: A product and system is disclosed for intelligently controlling the number of amplifier modules that are active in a linear amplification system. By exercising such control, the system can avoid using unnecessary power. The invention monitors the system and gathers information from signals associated with the system, particularly information concerning signal power. A control functionality evaluates the gathered information to decide how many modules are necessary to sufficiently operate the amplification system or to decide if it has been commanded to perform certain functions. Once this decision is made, the control functionality communicates control signals to the power amplification modules to activate the needed or desired number of modules and deactivate the unneeded or undesired number of modules. Likewise, the control functionality configures the splitter and the combiner according to the number of needed or desired amplifier modules. This gathering, evaluation, and control is conducted continuously.

Abstract: The present invention relates to a method and an arrangement for determining a hot spot of telephone traffic in a cell. The invention uses simultaneously two basic measurements of digital radio systems; timing advance and adjacent cell measurement. Timing advance informs the distance of the mobile station from the base station but not the direction. On the basis of the measured signal strengths of adjacent cells it is possible to determine a set of possible locations of the mobile station when there is information about the coverage area of individual adjacent cells. When these measurements are used simultaneously, they exclude the inaccuracies of each other and enable very accurate location determination for monitoring traffic distribution.

Abstract: An expandable repeater includes N repeater units connected to an integrator device and a bus. Each of the N repeater units has an input/output connected to the bus for exchanging clock, data, and to receive network status signals. Each repeater unit also provides status signals to the integrator device. The status signals indicate the data repetition status of that repeater unit to the integrator. The integrator receives N (where N is the number of repeater units to be combined by the integrator) sets of status signals from the repeater units, supplies network status information to the bus, and exchanges clock information and data with the bus. The integrator selectively executes the data and clock repetition, and provides a global network status signal in response to the status signals received from all of the repeater units connected to the integrator. A number of integrators may be combined in a similar fashion to further expand the repeater.

Abstract: A plurality of transmitting and receiving stations are provided at randomly distributed locations within a telecommunication network, and switching circuitry is provided within the stations themselves for routing of calls between stations in the network utilizing other stations in the network for relaying of such calls where necessary. To this end each station incorporates a call routing control unit acting to select a further station to which a call from a source to a destination is to be transmitted for the purpose of relaying the call. The call routing control unit transmits an interrogation signal to be received by other stations in the network within range of the transmitting station, and the call routing control unit of each of the other stations transmits an acknowledgment signal when the station is available for relaying a call in response to the interrogation signal received from the station.

Abstract: In an ad-hoc radio communication system comprising a plurality of stations (100) formed into at least one network (102a,102b), each station (100) is assigned a rank representative of its suitability for performing the role of master station in a network (102a). The rank may for example be assessed depending on the performance of the station's antenna (204) or its access to mains power. It is arranged that the station (100) having the highest rank in a network (102a,102b) performs the role of master for that network, thereby improving the efficiency of communication in the network.

Abstract: The method and apparatus for automatically monitoring call processing transactions performed in base stations of a mobile cellular telecommunications switching system. A mobile switching center maintains a list of mobile stations whose calls are being monitored. When one of these mobile stations originates a call, or when an incoming call is received for such a mobile station, the base station originally serving the call is notified, and that base station then transmits messages recording reportable events for that mobile station. When that mobile station is handed off to another base station, the other base station receives an indication from the first base station that it is to monitor the call of that mobile station. When a base station no longer serves a mobile station that is being monitored, it clears the record that the mobile station is to be monitored from its data base.

Abstract: A telecommunications system and method is disclosed for providing a cell traffic supervision alarm within a base station (BS) to notify the operator at a Mobile Switching Center (MSC) serving the BS that the BS has had no traffic for a period of time that is unreasonably long. The definition of “unreasonably long” is tied to normal traffic patterns at the BS. An alarm threshold time, which is defined as time between the cessation of all traffic on a BS and the triggering of the alarm, can be calculated based upon a statistical analysis of the traffic history of the BS to determine a time interval such that the probability is acceptably small that under normal conditions the BS would have gone for that entire length of time with no traffic at all. At the expiration of the alarm threshold time, the alarm is activated.

Abstract: A method and apparatus for using a loopback capability of a radio frequency (RF) repeater to provide for end-to-end testing without a wireline connection is disclosed. A RF source sends a signaling waveform to the RF repeater. Upon receiving the signaling waveform, the RF repeater enters the loopback mode. The RF source sends another identical signaling waveform to the RF repeater to end the loopback mode. In another embodiment, a base transceiver station (BTS) sends a signaling waveform to an intelligent RF repeater-translator upon detection of a lack of activity. The received signaling waveform places the intelligent RF repeater translator into a loopback mode. If alarms are present in the intelligent RF repeater-translator, the intelligent RF repeater-translator ceases processing and the BTS informs the OMC of the error condition. Otherwise, the loopback mode is entered and BTS initiates testing of the intelligent RF repeater-translator.

Abstract: The present invention relates to a system and a method for monitoring and controlling RF signal processing units in a wireless communication network, and, more particularly, system and method for remotely monitoring and controlling the functional status of RF signal processing units of numerous base stations in a wireless communication network by extracting the spectrum feature of high frequency that is processed by the RF signal processing unit and represents the functional status of the RF unit in each base station, and then comparing the extracted spectrum with the predetermined spectrum curve in the remote site.

Abstract: A method for evaluating the performance of a LEOS system. The evaluation may determine the minimum and maximum number of hops or delay time required to service a particular source and destination pair or may evaluate the LEOS system as a whole. The evaluation may be used in the design of LEOS systems or to evaluate the performance of an existing LEOS system. This evaluation may then be employed to determine how and when the LEOS system should be employed in servicing communications. A LEOS system constellation is received that is to be considered. Then, a mathematical model for the LEOS system is determined. A source/destination location pair is then selected for consideration. Shortest, longest and intermediate path lengths are then determined for the source/destination location pair for the LEOS system. For each of these path lengths, the probability of occurrence of each of these path lengths as well as a corresponding delay is then determined.

Abstract: A radio frequency communication system includes a cell site (FIG. 1), the cell site including an on-line controller (100), an off-line controller (101) and one or more peripheral units (107, 108, 110, 112, 114) arranged to support the on-line controller. The cell site is arranged to switch from the on-line controller to the off-line controller based upon a failure of the on-line controller or a failure of any peripheral unit of the one or more peripheral units arranged to support the on-line controller.

Abstract: A radio communication system assigns one repeater the role of priority repeater, whereupon that priority repeater exclusively relays all messages between one or more portable radios and a base site. The priority repeater monitors various indica relating to its level of activity, and transitions to a non-priority state when the level of activity exceeds a prescribed threshold. In one embodiment, the repeater includes a counter for counting the number of transactions performed since the repeater was assigned the role of priority repeater, wherein the count serves as the activity level measure. In another embodiment, the repeater includes a timer for determining the amount of time which has transpired since the repeater assumed the role of priority repeater, wherein this time value serves as the activity measure. Still another embodiment uses battery level as a proxy for activity level. The above techniques may be employed in a non-trunked type of repeater or a trunked type of repeater.

Abstract: An apparatus includes a demultiplexer/multiplexer and a local area network (LAN) controller that use an installed cable television cable to establish and control a home LAN. One or more channels of the cable are separated and blocked from the cable television signal path. The blocked channels form a signal path between the LAN controller and peripheral devices connected to the home LAN. The LAN controller is programmable to include a set of heuristics and corresponding instructions for monitoring and operating the peripheral devices. The LAN controller monitors the peripheral devices and provides status messages based on states of the peripheral devices. The LAN controller also receives and executes commands to operate the peripheral devices.

Abstract: A method and system for a communication system with a communication center, a communication site, a user station and a remote unit allowing the communication center to communicate with the user station over a user channel and communicate with the remote unit over a system channel such that the communication center can monitor, operate or control the remote unit on as needed basis.

Abstract: A telecommunication device has a processor for processing data and a memory which stores the data. The memory is coupled to the processor by a data bus and an address bus. A first address counter provides an output address to the memory for reading out a desired data having the output address. A count of the first address counter is changed to a current address in response to a control signal from the processor, each time the processor generates a desired address. The current address is provided to the memory as the output address which is also the desired address. A comparator compares the desired address with the output address from a second address counter and outputs a load signal to the first counter when the current address from the second address counter differs from the desired address. The load signal loads the desired address in the first counter over the address bus when the current address differs from the desired address so that the output address is equal to the desired address.

Abstract: To ascertain in a pseudo-incoming call sequence whether or not a fixed subscriber unit of a user is set to an operation condition to wait for an incoming call, when a pseudo-incoming call is transmitted from a pseudo-incoming call outputting unit of a base station managing apparatus to the fixed subscriber unit through a wireless base station and a radio communication path, the fixed subscriber unit outputs an incoming call response signal to the base station managing apparatus through the wireless base station. Therefore, the base station managing apparatus can recognize that the fixed subscriber unit is set to an operation condition. Thereafter, to prevent a telephone connected with the fixed subscriber unit outputting a ringer sound, in place of a ringer sound urging signal in an incoming call sequence, a sequence interrupting signal is output from an incoming call sequence interrupting unit of the base station managing apparatus to the fixed subscriber unit through the wireless base station.

Abstract: A method of reducing paging channel usage in a CDMA communication system. Each mobile switching centre maintains in its visitor location registry information regarding a paging channel or carrier frequency that each mobile station registered is monitoring. Then, when it comes time to send a page to a mobile station, the mobile switching centre looks up the information and appends it to the page which is sent to all basestation transceivers. The basestation transceivers extract the information and identify the paging channel the mobile station to which the page is addressed is monitoring. The transceivers then broadcast the page message over their air interfaces on the identified paging channel.

Abstract: A monitor/hands-free intercom system includes a child unit and a parent unit which are each transceivers. The parent unit operates primarily as a receiver, unless and until a talk switch is actuated on the parent unit, enabling the parent unit to transition to a transmitter. The child unit acts primarily as a transmitter unless and until it detects a carrier signal at the appropriate frequency during one of its short sniff periods. If a carrier signal is detected, the child unit extends the sniff period to look for a non-audible hidden tone encoded into the transmission from the parent unit. If the hidden tone is detected, the child unit transitions to a receiver mode and is able to play back the sound waves detected by the parent unit so that the parent can reassure or provide instructions to the child.

Abstract: A distributed strip-type radiating cable comprised of a plurality of generally flat conductive strips disposed in substantially parallel relationship to one or more generally flat dielectric materials, adapted to radiate RF energy for communications applications. The radiating cable is designed to be efficiently and inexpensively manufactured and installed from lightweight, small size materials, and is designed to be easily attached and secured to a variety of surfaces.

Abstract: A great number (typically over 1 million) radio-communicating monitors of electricity consumption (typically all-electronic computerized wattmeters) distributed over a large geographical area (typically over 4500 square miles) communicate over radio frequency band (typically V.H.F. band at a one of three different frequencies) to multiple (typically over 45) regional central stations. Communication both to and from distant monitors is multi-path multi-link radio through intervening monitors, commonly located each in an associated annular concentric ring centered about a regional central station. Individual monitors from 0 to typically 5.64 miles distance from regional central stations are individually interrogated of typically 25 bytes information in typically up to 5 relays both outgoing and incoming during a time interval of up to typically 9.78 seconds at data transfer rates of typically 6 kbaud/second. Some 1.2 million monitors, called "demand relay meters" can typically be read out in 55 hours.

Abstract: A wireless remote data sensor is disclosed for use in the cable television industry. It senses the status of equipment in the field, such as battery backup power equipment, amplifiers, pilot and signal level monitors, and voltage level for powering active equipment, and transmits the status information using a low data rate cellular data service known as Cellemetry. It also allows the cable system operator to switch each power supply to a backup power source and back remotely for conditioning and battery capacity measurement. Cellemetry uses the forward and reverse control channels of the AMPS cellular network to communicate 32 bit data packets.

Abstract: A method for enhancing the performance of a communications system is disclosed. The system generally includes an originating ground station (300) which produces error-control coded uplink signals and transmits the coded uplink signals to a satellite (310). The system also includes a destination ground station (326) which receives a downlink beam from the satellite (310). The method includes the steps of receiving uplink signals transmitted by an originating ground station (300) at a destination ground station (326) and determining a downlink channel signal quality indication (504) at the destination ground station (326). The method also includes the steps of measuring an error rate associated with at least a portion of a downlink beam at said destination ground station (326) and determining an operating point (506) relative to a desired performance curve (502) based on the signal quality indication (504) and the error rate.

Abstract: A direct mode repeater for forwarding traffic between mobile stations communicating on a direct mode channel, includes a transceiver unit for forwarding radio messages between mobile stations communicating on a direct mode channel, and a control unit for controlling the operation of the repeater and for directing the transceiver unit to the direct mode channel. In order to prevent simultaneous transmission of several repeaters on the same direct mode channel. The transmission on the direct mode channel of the repeater that forwards radio messages on the direct mode channel contains at desired intervals the identifier of the repeater, the identifier indicating that the repeater forwards traffic on the direct mode channel.

Abstract: A radio communications system is intended for use by trains in a tunnel. This system includes an antenna subsystem which incorporates a radiating coaxial cable disposed along the length of the tunnel and extending beyond the portals thereof, including surface coverage for transition. Plural bi-directional, in-line amplifiers are inserted along the length of the radiating coaxial cable at predetermined intervals for amplifying the RF signals carried by the radiating coaxial cable. A monitoring repeater and a control repeater are provided along with an interface for joining the two repeaters to the radiating coaxial cable. A monitoring subsystem includes an end-of-train device and a head-of-train device.

Abstract: A system and method for storing and retrieving performance and topology information of a telecommunications network. A network performance data parser receives network performance data messages in real time, parses the messages according to parsing rules, reformats the messages according to the parsing rules, and writes out the reformatted messages to a performance data file. A network performance data loader retrieves the reformatted messages from the performance data file and loads them into an open database management system. A topology data loader retrieves weekly network topology data from a topology data file and loads it into the open database management system. A SONET data loader retrieves daily network SONET data from a SONET data file and loads it into the open database management system. The open database is easily accessible via any SQL interface.

Abstract: A device for implementing a multimedia communication dissemination system is disclosed herein. The communication system integrates heterogeneous satellite transmission systems, local area computer networks, and the public telephone system to implement a flexible, high-speed communication system. The preferred communication dissemination system includes a broadcast server for broadcasting an information signal, a mobile base station for receiving the information signal broadcast from the broadcast server, and a local area network for distributing information received by the mobile base station. The preferred mobile base station includes a receiver for receiving information signals transmitted from a broadcast server, a network interface for distributing processed information signals, and a software proxy process for processing information signals. A software proxy process controls the dissemination of information through the network.