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US5606725A
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Broadband network having an upstream power transmission level that is dynamically adjusted as a function of the bit error rate
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US5488413A
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CATV telephony system using subsplit band for both directions of transmission
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US5513173A
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Data link access unit for T1 spans supporting the extended superframe format (ESF)
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US5301187A
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System for implementing broadband audio program telephony circuits using 2B1Q technology
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US5408524A
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Answer supervision over pulse code modulated carrier system and method therefore
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US5081670A
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Smart data station termination (DST) without active equalizers
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US5140625A
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System for testing 2B1Q telephony loopback circuits and method therefor
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US5151935A
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Programmable universal signaling circuit for a telephone network
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US5197068A
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Intra channel bank communication protocols between channels and the line interface unit of a telephone system
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US5247574A
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Adaptive no balance DX signalling circuit
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US5131033A
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Sealing current generator for a telephone circuit
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US5034978A
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Universal channel unit switchable between two wire and four wire configurations
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