Patent
Line unit interface circuit
Gary B. Cole,Michael J. Gingell,Joseph E. Sutherland,Paul M. Matsumura +3 more
- 07 Dec 1990
22
TL;DR: In this paper, a flywheel circuit is used to prevent erroneous time slot assignment in the event of noise or interference on the line unit interface bus, and a timing offset between the transmit and receive strobes provided to each subscriber line circuit.
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Abstract: A line unit interface circuit used on line units in a line shelf of a digital loop carrier provides all of the logic necessary to access two subscriber lines to a line unit interface bus connected to common equipment within the line shelf. Information received from the common equipment includes signaling data, configuration data and provisioning data, which is reconfigured and processed by the line unit interface circuit for controlling the subscriber line channels. Configuration data from the common equipment is decoded to assign time slots on the line unit interface bus to the various channels serviced by the line shelf and to further provide for a timing offset between the transmit and receive strobes provided to each subscriber line circuit. A flywheel circuit is used to prevent erroneous time slot assignment in the event of noise or interference on the line unit interface bus.
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Citations
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42
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42
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Patent
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15
Patent
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Enrique Gueldner
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14
Patent
Pre-cutover verification of switching system subscriber lines served via digital carrier facilities
Patrick K. Brady,Cecilia S. Chen,Barry L. Posterick,Gilbert Mark Stewart +3 more
- 01 Jul 1985
TL;DR: In this article, a test arrangement and method for use prior to the replacement of a first switching system serving a plurality of subscriber lines via a digital carrier facility and via a remote terminal, by a second switching system, where facility interface equipment of the second system is bridged directly onto the digital facility to allow monitoring of digital signatures transmitted from the remote terminal during the continued, uninterrupted operation of the first system.
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