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Selective prevention of bipolar violation detection
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Universal high-speed span line switch
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Frame recovery circuit for receiver for pulse code multiplexed signals
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Method and apparatus for pulse train synchronization in PCM transceivers
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Telephone system using pulse code modulated subscriber lines
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Receiver for pulse code multiplexed signals
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Method and means for transmitting low speed signals over a PCM framing code
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PCM encoder with variable set-up intervals
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Method and means for powering telephone span lines
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Dual-processor line concentrator switching system
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Method and means for detecting an outgoing failure in a bidirectional communications span and looping the same in response thereto
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Automatic span line switch
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Maintenance monitor for telephone switching systems
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Clock synchronization circuit
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Receiver for decoding duobinary signals
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Call concentrator switching matrix
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Call concentrator with expanded intracall capability
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Pulse sampling and reshaping circuit
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Sampling and retiming circuit for pcm repeaters
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