摘要:
An ISDN interface is provided on a card, which is adapted for mounting in a terminal computer and which is operable to exchange data with a terminal computer and an ISDN. The ISDN interface card includes a protocol processor that is programmable to process data encoded in accordance with a number of different protocols and a digital signal processor that is programmable for data compression, encryption and facsimile applications, and u-law and a-law conversion, among other applications. The ISDN card dynamically allocates data calls between one or two B-channels to achieve a data transmission rate of 128 kbps. A power supply with a ring generator is provided to allow for the use of an analog telephone with the ISDN card. The ISDN card is programmable to allow users to create customized screens for various call processes, and to allow for the updating of a flash ROM coupled to the protocol processor through the terminal computer and the ISDN.
摘要:
A passive ISDN adapter card includes a serial controller (1) as is normally used to connect an external data transmission device; an ISDN data transmission controller (2) connected to the serial controller and controlled by the CPU of a computer (4); and an ISDN connection controller (3) controlled by the CPU of the computer (4) and connected to the data transmission controller (2). The ISDN adaptor card is compatible with a modem connected to the serial port without an INT-14-H interface for the evaluation process.
摘要:
Data received from a first layer is processed in a communication processor. Memory controller determines whether or not an instruction to be processed next by a processing circuit is stored in an internal RAM. When it is stored, it reads the instruction from internal RAM, and otherwise, it reads an instruction from an external ROM through an DMAC. Processing circuit changes setting of register values in respective registers in memory controller to values of the corresponding layer, when processing for one layer is completed. Consequently, the layer to be processed by the communication processor is switched.
摘要:
In communication which uses a communication line which allows the determination of a communication protocol in a communication port prior to the communication like in an ISDN network, a communication program corresponding to the determined communication protocol is dynamically linked and initialized to allow dynamic selection of the communication protocol.
摘要:
A method apparatus for selectively passing various types of telephony information between a data communications port on a digital telephone and a computer run application program. In one embodiment, the application program can select a subset of telephony events by way of a telephony command to the telephone's data communication port. This command is processed by a telephony command processor within the data communications controller which, in turn, sets a programmable event mask within the telephone. In response to the event mask being set, only the selected telephony events are spontaneously reported to the host computer and application program.
摘要:
An application program interface for integrated services digital networks is implemented so that application programs can be generated independently of network protocols (Layer 1, 2; 1TR6, VN2) and independently of the respective implementation of service features. The application program interface contains for each network service an independent service program module (Telephony, FAX, Packet data, Teletex, . . . ) with a message set representing procedures as specified by standards (CCITT, ETSI, . . . ).
摘要:
A modular suite of peer-to-peer protocols that are independent of communications network architecture supported, and the type of switching systems (packet-switched or circuit-switched), is used for a broadband and/or narrowband communications network. The protocols are comprised of client-server-oriented signaling messages that are restricted to include information and parameters associated with only one particular function of traditional call processing.