摘要:
There is disclosed a data interfacing method in a key-phone system and a subset key-phone system capable of speedily processing an event generated from a key-phone system by use of two data interfacing sections between the key-phone system and subset key-phone. The invention to increase the data interfacing speed includes: a first step for reading a state data of data received from a data receiver 43 and checking whether said received data is effective; a second step for reading the data from said data receiver 43 when the received data in said first step is effective, thereafter checking whether it is null data. If it is null data the system returns to said first step; a third step for processing the read data when it is not null data in said second step and sequentially outputting the first and second processed data to a data transmitter means 45, thereby ending the process; and a fourth step for outputting an error message to the key-phone when a parity error is generated in said first step and, then, ending the process.
摘要:
8 kHz ASK signals are produced by an electronic business set instrument to function as control or feature signals. To avoid the problems of transmitting the 8 kHz ASK over voiceband telephone lines over long distance, the least significant bit (LSB) of each 8 bit word representative of voice signals is caused to be at a predetermined level (e.g., low) when an ASK signal is present and at the other level (e.g., high) when there is no ASK. At the receiving end, the state of the bit is used to regenerate the 8 kHz. Detection of the ASK is performed by a high-pass filter.
摘要:
There is disclosed a communication system and operating method wherein the manner in which all telephone calls are displayed at a station set allows uniform user operations to originate and terminate those calls. This is accomplished by having all calls dynamically assigned to the same set of general call appearances (buttons on a multibutton station set). There are no call appearances that are dedicated to specific call types. This allows the station set user to perform the same set of operations on all calls by using the same sequence of physical operations independent of the type of call. Additionally, the system may reserve one call appearance button at a station set for special use.
摘要:
A control signal transmission system for a key telephone system, in which control signal information is transmitted in a parallel signal configuration between a plurality of key telephone sets and a key service unit by the use of transmission lines one-to-one corresponding to the individual key telephone sets, and in which the information between the key telephone sets is transmitted using a serial signal format of a frame configuration so that time slots of respective frames are synchronized with respect to all of the transmission lines.
摘要:
A key telephone system having a plurality of key telephone sets and a key service unit. Intercom lines connect the key service unit and the key telephone sets. A synchronizing system in each key telephone set is provided for synchronizing signal transmissions from the corresponding individual key telephone sets of the key service unit with the transmissions from the key service unit. The individual synchronizing systems receive a multiplex transmission from the key service unit and the transmission has a multiplexed frequency signal as a control signal and also has a voice signal. The control signal includes control transmission data to the synchronizing system and includes a start bit following a fixed number of signals having a binary state opposite to a binary state of the start bit. Circuitry is provided including a high pass filter which removes the voice signal and for converting the frequency shift signal free of the voice signal to the transmission data control signal with control transmission data. Detection circuitry detects the reception of the start bit and develops an output and other circuitry receives the output and determines it is a synchronizing signal and develops a reset pulse. A shift clock pulse generator receives the reset pulse and develops output timing shift clock pulses effecting synchronization of transmissions between the key service unit and the corresponding key telephone set.
摘要:
A reception system for a key telephone system, in which a voice signal and a control signal having the form of a frequency shift signal are multiplexed in an intercom line for transmission. In accordance with the present invention, there is provided means for extending by a predetermined period of time the period of a first clock pulse at the time of a key service unit transfering from the transmitting state to the receiving state, so that the center of data transmitted may coincide with the readout timing for reception.The means for extending is arranged so that it may apply a reset pulse to a reset terminal of a frequency divider of an oscillator for generating the lock pulses.
摘要:
A telephone keyset is disclosed which has a dialpad of dialing keys, a series of line keys, at least one function key and a telephone receiver hook switch. Each of the line keys is provided with a lamp, such as an LED, for indicating when the telephone line associated with that line key is in use. The keyset apparatus also includes a programmed device, responsive either to the operation of the function key or the hook switch, for turning off all the indicator lamps with the exception of that lamp associated with that telephone line which the keyset apparatus is currently using.
摘要:
A synchronization system for a key telephone system, in which key information or the like information signal between a key service unit and each key telephone set is transmitted in the form of a time-division pulse signal under the control of a counter provided in the key service unit. The information signal has a format which is divided into a first signal from the key service unit to each key telephone set and a second signal from each key telephone set to the key service unit so as to make distinction between the first and second signals in terms of time. The first signal is disposed in a time slot preceding the second signal to provide a pair of signal groups. A one-pulse start signal is disposed in the foremost time slot of the signal groups and a one-pulse answer signal is disposed in a time slot between the first signal and the second signal.
摘要:
A telephone call handling system for use with key telephone systems, including means for displaying at a called extension the identification number of the line on which the incoming call is received. A receptionist enters extension and line identification data by means of a key pad or dial, thereby causing corresponding electrical signals to be generated. An address network responds to the extension identification signal to transmit the line identification signal to the called extension. A digital display at the called extension indicates the line on which the incoming call is received, and a buzzer produces an audible signal at the called extension, in response to received line identification data.
摘要:
This invention relates to an apparatus and method for monitoring a telephone line and particularly to multiline equipment where a calling party or line may be placed on ''''hold'''' for a period of time. This condition indicating reminder automatically starts measuring the accumulating time interval of each hold signal and at a preselected period of elapsed time causes a visual and/or audible signal to be actuated. This monitoring equipment in one embodiment is shown arranged for the normal five lines usually available on a push button set but may be for any number of phone lines of more than one and having a hold arrangement for a line. In an alternate embodiment particularly for phone apparatus having no hold buttons or a switchboard equipment where the hold is achieved by a switch means which does not cause a voltage change on the ''''R'''' and ''''T'''' lines, this alternate reminder apparatus and method monitors a connected line for audio signals and in the absence of such signals after a short time delay initiates the starting of an elapsed time clock and and associated apparatus.