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JPS60194898A |
PURPOSE: To display a call even when either line A or line B is positive by inserting a couple of light emitting diodes connected oppositely to a telephone set loop information display circuit and combining properly a contact of a CTG re...
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JPS60183893A |
PURPOSE: To make a complicated timing circuit required for a sequential control unnecessary and to equalize an operation period to that of one stage by providing switch control parts for the 1st, 2nd and 3rd switches independently. CONST...
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JPS60183897A |
PURPOSE: To enable a high rate transmission of telephone number information for connecting subscribers mutually between two stations by a simple I/O circuit by providing a serial transmission means for transmitting/receiving data between...
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JPS60183896A |
PURPOSE: To realize omission of various lines while a caller and a called party are in busy in either case where the caller and the called party are on the same line or on a different circuit by enabling detection with the same trunk. CO...
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JPS60183894A |
PURPOSE: To set optionally a subscriber circuit to be broadcasted and to modify easily the range of a broadcasting output by providing a control circuit switched for inputting a broadcast sound to a telephone set at every subscriber circ...
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JPS6041917B2 |
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JPS60116781U |
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JPS60145796A |
PURPOSE: To obtain miniaturization and light weight and to improve operability by allowing a party-line telephone set interface and an exchange interface in a signal repeater which is used when an emergency circuit or a temporary circuit...
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JPS6028195B2 |
PURPOSE:To make it possible to send a number even in service by use of a push- button dial by providing a main unit with a few sound-frequency-dial code generating circuits. CONSTITUTION:When button telephone set KTO acquires trunk line ...
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JPS6028176B2 |
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JPS6022871B2 |
PURPOSE:To offer complete circuit reservation service and to send originating signals from telephone sets by operating external circuit selection buttons of telephone sets and by storing reservation information when the external circuit ...
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JPS6022869B2 |
PURPOSE:To shorten the required time of information processing by transferring information between a terminal unit and key telephone set at a time by checking information on each unit by a main control unit and then by holding obtained i...
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JPS6022872B2 |
PURPOSE:To reduce the probability that calling is impossible due to engagement in terms of an extension call by making an extension connection between extensions of telephone sets via a link circuit and by automatically releasing a circu...
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JPS6022867B2 |
PURPOSE:To simplify the circuit constitution by installing the constant current circuit using the operational amplifier to the slave unit using the key telephone system in which the call current system is cut off from the main wire in th...
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JPS6022870B2 |
PURPOSE:To make it possible to offer circuit reservation service with efficiency by acquiring an external circuit only in a certain time until a telephone set sends an outgoing signal when the external circuit is not engaged with the ext...
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JPS6022868B2 |
A key telephone exchange system comprises office line units connected to office lines, terminal units respectively connected to key telephone sets and a main control unit for changing connections between respective office line units and ...
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JPS6019880B2 |
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JPS6019877B2 |
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JPS6019878B2 |
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JPS6019875B2 |
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JPS6064597A |
PURPOSE: To call individually a branch telephone set by providing a multi-frequency signal reception means receiving a branch telephone set identification number by a multi-frequency signal for pushbutton dial transmitted from a calling ...
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JPS6016092A |
A circuit for adapting a telephone subscriber line to operate as a multiparty line is described wherein a plurality of conventional single line subscriber subsets are provided telephone service on the subscriber line such that each subsc...
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JPS6010993A |
PURPOSE: To allow a called subscriber to receive a call tone at an optimum level by controlling a signal transmitter so as to give a transmission level corresponding to a transmission line loss including each subscriber. CONSTITUTION: A ...
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JPS601796B2 |
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JPS601997A |
PURPOSE: To connect plural magneto telephone sets in parallel with a 2W magneto telephone line with simple constitution comprising only relays by controlling the ringing of a bell by a transmission line interrupting relay interrupting te...
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JPS5952594B2 |
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JPS59224997A |
PURPOSE: To simplify an adaptor by providing additionally some function to the adaptor at a branching point so as to eliminate the need for the function of the adaptor as a relay exchange. CONSTITUTION: A trunk TRK used in common for the...
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JPS5950152B2 |
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JPS5950157B2 |
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JPS5950156B2 |
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JPS5950154B2 |
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JPS5950155B2 |
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JPS5950153B2 |
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JPS5947919B2 |
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JPS59193661A |
PURPOSE: To prevent good external appearance from being lost by accommodating various sensors in an interface device and transmitting sensor information by a controller of a telephone set so as to decrease amount of wirings. CONSTITUTION...
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JPS59178095A |
PURPOSE: To attain effectively the privacy call of a party line telephone set using a digital line by providing a ciphering and a deciphering section to a telephone set and a subscriber circuit, and decoding information based on an ID (c...
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JPS59140567U |
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JPS59148495A |
PURPOSE: To attain individual selection by connecting a private branch of exchange with extension circuits having the same number of slave stations so as to connect branching type exclusive lines to an optical private branch of exchange....
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JPS5932955B2 |
PURPOSE:To enable to call out the maintenance personnel with the buzzer in the system failure alarm circuit, by providing callout keys in a system failure alarm circuit. CONSTITUTION:When a CALL key of a container 1 is on, a current flow...
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JPS59123394A |
PURPOSE: To simplify the software and processing by making a time division exchange regard a party line telephone and a single subscriber telephone as the same interface on the software. CONSTITUTION: The single subscriber telephone set ...
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JPS5928318B2 |
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JPS5927556B2 |
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JPS5925551B2 |
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JPS5925516B2 |
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JPS5919504B2 |
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JPS5917575B2 |
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JPS59500037A |
In a digital telephone system, a digital private automatic branch exchange (PABX) has a plurality of digital line cards for coupling the PABX to respective digital subscriber sets via subscriber lines. In each digital line card, a digita...
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JPS5858874B2 |
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JPS5857012B2 |
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JPS5856311B2 |
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