Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Espana SAfiledCriticalAlcatel Espana SA
Publication of ES426724A1publicationCriticalpatent/ES426724A1/en
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/26—Devices for calling a subscriber
H04M1/30—Devices which can set up and transmit only one digit at a time
H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Exchange Systems With Centralized Control
(AREA)
Abstract
A push-button telephone device that includes a keypad to send the desired subscriber numbers, one or more signaling devices, a common signal generator, a common set of multiple data conductors to which the keypad is connected to the aforementioned devices and the generator of signal, control elements associated with the keypad and with the mentioned devices in such a way that only the keypad or one of the devices can cooperate with the signal generator, and a generator output by which numbers or other signals can be sent to a central, as a result of the cooperation of the signal generator with the keypad or with one of the devices. (Machine-translation by Google Translate, not legally binding)
A circuit provision for a telephone installation with call number transmitters for the reception of short characteristic numbers. (Machine-translation by Google Translate, not legally binding)
Improvements in devices to select automatically a telephone subscriber connection and give passage to an alarm signal when an alarm switch is activated. (Machine-translation by Google Translate, not legally binding)
CIRCUIT ARRANGEMENT FOR THE INDEPENDENT SUBMISSION OF MESSAGES TO CALLING PARTIES IN REMOTE COMMUNICATION SYSTEMS, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS.