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DE3542405C1
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Telephone exchange circuitry identifying caller - assigns two microprocessors, matching circuits and memories to subscriber selectors
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DE3522945C1
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Circuit arrangement for automatic announcement of changed telephone numbers
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DE3517017C1
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Circuit arrangement for telecommunications switching systems with direct dialling-in
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DE3444872A1
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Arrangement for testing subscriber connection lines
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DE3412940C1
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Soldering tip for wrap strips
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DE3326979A1
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Circuit arrangement for telecommunications switching systems with direct dialling
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DE3326064C1
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Detection circuit for a mismatch on one side of a hybrid amplifier circuit
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DE3324156A1
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Arrangement for generating clock signals for charge metering
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DE3323534C1
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Sensor for detecting the traffic of information streams consisting of analogue signals on telecommunication lines
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DE3226764A1
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Arrangement for converting a measurement voltage to a constant amplitude whilst retaining its frequency
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DE3220905C1
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Sensor for monitoring traffic from data streams comprising analog signals on telecommunications lines
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DE3207556A1
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Arrangement for measuring the characteristic times of pulses and pulse series
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DE3205683A1
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Arrangement for converting a measurement voltage to a constant amplitude whilst retaining its frequency
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DE3202121A1
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Arrangement for recording communication traffic on permanently connected telecommunications lines
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DE3127508A1
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Arrangement for section-by-section measurement of permanently connected transmission paths
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DE3125328A1
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Electronic emergency telephone
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DE3122615A1
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Sensor for monitoring traffic of data streams comprising analog signals on telecommunications lines
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DE3110633A1
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Arrangement and method for section-by-section measurement of permanently connected transmission paths in telecommunications systems
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DE3046488A1
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Damping ratio equalising circuit for two wire speech transmission - uses compressor amplifier and speech recognition circuit for each direction
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DE3017623A1
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Traffic sensor for telephone lines - has evaluating circuit and amplitude limiting threshold value circuit
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