Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1990-11-20
1993-03-16
Dwyer, James L.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379157, 379201, H04M 1100
Patent
active
051951290
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention generally relates to switching systems for application services, and more particularly to a switching system for application services including a switching equipment which is coupled to terminals such as telephone sets with displays and an external application processor which is coupled to this switching equipment and stores programs for the application services.
2. Background Art
In a switching system for application services, a user makes access to an external application processor from a telephone set via a switching equipment by manipulating keys of the telephone set in a certain manner. Thus, the user can receive an application service which is provided by the external application processor. As examples of the application services, there are message display service, conference room reserving service, air conditioning control service, illumination control service and the like.
FIG. 1 generally shows an example of a conventional switching system for application services. In FIG. 1, the switching system for application services includes a digital telephone set 1 having a display, a line circuit 2, a switching equipment 3 and an external application processor 4. The telephone set 1 includes a handset 1A having transmitter/receiver functions, a display 1B for displaying various messages, a dial button group (key pad) 1C including a plurality of key buttons which are assigned numbers and predetermined symbols, and an application key button ID which is used when receiving an application service.
FIG. 2 shows the telephone set 1 and the line circuit 2 in more detail. In FIG. 2, a line terminating part 1E of the telephone set 1 separates and integrates audio signals and control signals. With regard to the audio signals, the signal transmission and reception are made between the line terminating part 1E and the handset 1A via a coder/decoder 1F and a telephone circuit 1G of the telephone set 1. With regard to the control signals, the signal transmission and reception are made between the line terminating part 1E and a controller 1H of the telephone set 1. The control signals include a signal for providing the application service.
The display 1B, the dial key button group 1C, the application key button 1D, a memory 1I and a hook switch 1J are connected to the controller 1H. The controller 1H can transmit signals to and receive signals from the display 1B, the dial key button group 1C, the application key button 1D, a memory 1I and a hook switch 1J.
The memory 1I stores programs which are required for processings in the controller 1H and transmission and reception data. The hook switch 1J detects an off-hook state and an on-hook state of the handset 1A.
The telephone set 1 is coupled to the switching equipment 3 via the line circuit 2. In other words, a driver 1K and a receiver 1L which are provided as transmitter/receiver part of the telephone set 1 are coupled to a corresponding receiver 2A and a corresponding driver 2B of the line circuit 2. The receiver 2A and the driver 2B are terminated at a line terminating part 2C. The audio signals and the control signals are separated and integrated in the line terminating part 2C, and the audio signals are transmitted to a network part 3A of the switching equipment 3. The control signals are transmitted to a common control unit 3B of the switching equipment 3 via an interface circuit 2D.
Frames which are transmitted between the digital telephone set 1 and the line circuit 2 have a structure in which audio bits V0 through V7 are inserted between a frame bit F and a control bit S, for example.
The external application processor 4 which stores a program for a predetermined application service is coupled to the common control unit 3B of the switching equipment 3. As application services, it is possible to consider message display service, air conditioning control service, illumination control service and the like, but the service is limited to one. That is, the external application processor 4 stores onl
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patent: 4763350 (1988-08-01), Immendorfer et al.
patent: 4776005 (1988-10-01), Petriccione et al.
patent: 4790003 (1988-12-01), Kepley et al.
patent: 4837807 (1989-06-01), Szeto et al.
Aritaka Norihiro
Kanai Tsuyoshi
Tachieda Hideo
Tada Naoto
Yazaki Masatomo
Chan Wing F.
Dwyer James L.
Fujitsu Limited
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