Abstract: In order to produce an accelerated connection between a subscriber terminal (1, 2) and a data network terminal (15) given a traditional switching system (3) and in order to avoid an uneconomical system load, it is provided that the subscriber terminal (1, 2) generates a special dial signal for dialing into the data network terminal (15). The switching system (3) must be fashioned in this case such that it recognizes the special dial signal and, upon its arrival, immediately initiates a forwarding to the data terminal network terminal (15).

Abstract: A data communication apparatus includes a calling section that performs a communication by sequentially transmitting a calling signal to a destination, and transmitting a shift notification signal that indicates a shift to a short previous-procedure. A memory stores destination information and modem control information in association with each other. When the destination to which the communication is performed corresponds to the destination information stored in the memory, the calling section transmits the shift notification signal, and controls a modem based on the stored modem control information so as to shorten a previous-procedure.

Abstract: An autobaud mechanism is executed by transceivers coupled to opposite ends of a communication loop, such as an extended range SDSL loop, to resolve the maximum data rate that can be supported by the loop, using signal power and quality measurements to first estimate the length of the SDSL loop and thereafter iteratively adjust baud rate and/or number of bits/per baud, as necessary, to realize an SDSL baud rate that will ensure error-free transmission over the loop.

Abstract: An autobaud mechanism is executed by transceivers coupled to opposite ends of a communication loop, such as an extended range SDSL loop, to resolve the maximum data rate that can be supported by the loop, using signal power and quality measurements to first estimate the length of the SDSL loop and thereafter iteratively adjust baud rate and/or number of bits/per baud, as necessary, to realize an SDSL baud rate that will ensure error-free transmission over the loop.

Abstract: The specification discloses a data transmission method by automatic frequency control, which automatically selects an optimal data transmission rate between a data-sending end (such as a personal computer) and a mobile phone. An automatic frequency control mechanism (program) is provided at the data-sending end that can automatically change the data transmission rate. Through the communications and protocol between the data-sending end and the mobile phone, the automatic frequency control mechanism starts to look for the highest transmission rate that both of them can reliably transmit data through a cable before transmitting data. Afterwards, real data transmission operations start so as to achieve the goal of transmitting data in the fastest speed and the shortest time.

Abstract: Modems, methods, and computer program products for recovering from errors during a tone reversal sequence between a modem pair detect a false tone reversal during a tone reversal sequence at a first modem. If a false tone reversal is detected, then the first modem requests that a second modem restart the tone reversal sequence. Tone reversal sequences are used, for example, in the startup protocols of both the V.34 and V.90 standards to calculate the round trip delay between two modems. Neither standard provides for any recovery procedure, however, should the tone reversal sequence fail. The modems, methods, and computer program products can allow errors in a tone reversal sequence to be addressed immediately rather than proceeding to later phases in the communication protocol where the errors may ultimately cause the communication session to breakdown.

Abstract: Various kinds of modem control information is stored for each destination, the modem is operated based on stored various kinds of control information to shorten a communication pre-protocol and transmit data when execution is carried out. Also, when a short previous-procedure does not normally proceed, communication is shifted to a second communication procedure whose speed is low so as to continue communication after a lapse of a predetermined period of time. When abnormality occurs after executing the short previous-procedure, various kinds of control information stored in memory means are erased and up-dated. Therefore, time for communication preprotocol is shortened, and a mounted short previous-procedure function appropriately operates even when a communication error rate is high or a line characteristic is changed.

Abstract: A data interface apparatus (10) provides an interface between an analog communications link (a2) and a digital communications link (d2). Analog dialling codes on the analog communications link (a2) are converted to control codes for controlling a digital communications interface (12) attached to the digital communications link (a2) for providing access to a digital communications network (16, 18, 20). Access to the digital communications link (a2) is selectively enabled by the data interface apparatus (10) in response to a password encoded as an analog dialling sequence on the analog communications link (a2) The data interface apparatus (10) delays call set-up with a modem (6) connected to the analog communications link (a1,a2) so as to synchronize completion of call set-up with another call set-up procedure performed on a remote analog link (a3,a4) connected to the digital communications network (16, 18, 20).

Abstract: A system and method for allowing multiple digital subscriber line modems to access a telephone line. The embodiments employ additional signaling protocols to enable equipped modems to distinguish between initiating and responding signals from initiating customer premise modems and telephone company central office devices. The additional signaling can take many forms that can be detected and used to distinguished signals. Preferably, the signal is a stealth signal as to not interfere with existing communication devices. A variety of application and embodiments are disclosed to enable a solution allowing multiple modems to access a telephone line.

Abstract: Detection by a PBX of an incoming call started by a modem The basic idea of the present invention consists of taking advantage of the compatibility of almost every modem to a specific protocol called AT or Hayes commands. According to the present invention, the AT-commands will be used to generate a code specifying that the far end telecommunications device which just dialed is a modem. Therefore, when the dialed telecommunications device is connected to a PBX, latter will have to recognize said code after which it will transfer automatically that call to this telecommunications device identified by the dialed extension phone number and being a modem. Then a telecommunications connection between both modem will be set up. Advantageously, it is then possible by using present invention to connect several different telecommunications devices on a PBX, all being identified by the same extension phone number like a telephone, a FAX and a modem.

Abstract: A method and apparatus for establishing a connection between a server and a remote device over a communication network. Data transmission is attempted at a first carrier frequency and bit rate. If transmission is unsuccessful, the bit rate is lowered. If transmission remains unsuccessful, the carrier frequency is changed to a second carrier frequency. As data transmission continues, the bit rate may be interactively increased or decreased in order to maximize data transfer throughput.

Abstract: A modem parameter required for a modem apparatus is stored in a memory for each telephone number of a communication destination in advance based on past communications. At a communication time, a receiver side is notified of an execution of the short protocol by a QTSD signal, and sequentially a QINFO signal that includes the modem parameter is transmitted. Since the modem parameter is received by the communication destination, the pre-protocols such as exchange of parameter, etc., are shortened so that communication time can be shortened. Moreover, since the transmission of modem parameter is repeated until it is confirmed that the communication destination receives the modem parameter, occurrence of communication errors can be avoided so that the shortened pre-protocols can be surely executed.

Abstract: A central site communication system selectively establishes a data connection between a remote system and one of group of host systems as a function of information about the remote system. The communication system can be connected to a digital data network such as via an ISDN or T1 network connection and the remote system can be connected to either the digital data network directly or through a Public Switch Telephone Network (PSTN) analog connection. The host system can be connect to the communication system via a LAN medium and utilize an IP network and a data tunneling protocol to establish a data connection between the remote system and the host system. The information about the remote system can include the telephone number of the remote system, the telephone number dialed by the remote system to connect with host system, the protocol used by the remote system or the data transmitted by the remote system to the host system.

Abstract: A fault detection system for performing analog current analysis and diagnosis of power devices on digitally controlled buses. The fault detection system includes a field-installable bus interface having a current sensor on a ground return line. A bus controller connected to the bus interface then applies digital control signals and power to a system assembly via the bus interface such that individual power devices are selectively energized. A real time current profile of the selected power device over a selected period of time is determined. A fault determination network compares the real time current against a set of predetermined criteria and determines whether the selected power device is acceptable. The predetermined criteria beneficially includes information useful for determining degradation of the selected power device so that fault correction before failure is feasible.