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US4267593A
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Method and means for digital conferencing
|
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US4289934A
|
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Integrated automatic call distribution facility and PBX system
|
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US4377843A
|
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Data distribution interface
|
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US4218589A
|
|
Method and apparatus for testing tone generators
|
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US4257119A
|
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PCM switching system for wide and narrow band signals
|
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US4266292A
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Method and apparatus for testing analog-to-digital and digital-to-analog code converters
|
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US4205203A
|
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Methods and apparatus for digitally signaling sounds and tones in a PCM multiplex system
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US4149038A
|
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Method and apparatus for fault detection in PCM muliplexed system
|
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US4185250A
|
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Voice frequency RC active filter
|
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US4359679A
|
|
Switching d-c. regulator and load-sharing system for multiple regulators
|
|
IL53188D0
|
|
Microprocessor control means for telecommunications switchng system and method of controlling a telephone switching exchange
|
|
ES463448A1
|
|
Improvements in telecommunication switching systems to connect to lines and links. (Machine-translation by Google Translate, not legally binding)
|
|
US4154988A
|
|
Method and means for accessing program memory of a common control telecommunications switching system
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ZA7706262B
|
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Microprocessor control complex
|
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US4256926A
|
|
Microprocessor control complex for a telecommunication switching system
|
|
US4146749A
|
|
Telecommunications network having multi-function spare network block
|
|
US4140882A
|
|
Methods and apparatus for special status indication in telephone systems
|
|
US4259549A
|
|
Dialed number to function translator for telecommunications switching system control complex
|
|
ES462128A1
|
|
Improvements in electronic hybrids. (Machine-translation by Google Translate, not legally binding)
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|
DD131890A5
|
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Electronic fork switching
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