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ISDN capacity expansion for remote terminal sites
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Method and apparatus for monitoring channel performance on a channel using alternate mark inversion protocols
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Method and apparatus for interface communications in a tandem cross connect
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Multirate automatic equalizer
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Digital subscriber loop termination device
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Automatic line buildout
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Data bridge with gating and/or testing
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DTMF Activated remote telephone line switching and testing
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Remote telephone line switching and testing
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Apparatus for recording a temperature profile
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