DSL Multiplexer for Fractional E-Carrier Transport
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Solution Overview
Problem
E-carrier and T-carrier services are cost-prohibitive for individuals and small businesses due to the persistent allocation of bandwidth, which increases costs despite providing high call quality.
Innovation Solution
A communication system that enables multiple interfaces to remote locations without hardware changes or upgrades, allowing multiple fractional E-carrier or T-carrier signals to be transported over a single Digital Subscriber Line (DSL) pair using multiplexer cards with differential signaling interfaces and Field Programmable Gate Arrays for timeslot mapping and error handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If E-carrier systems allocate bandwidth for the entire duration of a voice call, then call quality is maintained with constant bandwidth and system latency, but the cost of utilizing E-carrier systems increases due to persistent bandwidth allocation
Solution Approach 1:
The patent segments the E-carrier signal into individual timeslots, allowing selective extraction and remapping of only the necessary timeslots onto DSL infrastructure. This segmentation enables fractional TDM operation where only the required portion of bandwidth is allocated, rather than persistent full-bandwidth allocation, thereby reducing cost while maintaining call quality for active calls
Solution Approach 2:
The system changes the operational parameters by transitioning from full E-carrier bandwidth allocation to fractional TDM timeslot extraction. By remapping specific timeslots onto DSL frames with appropriate framing and synchronization parameters, the system achieves cost-effective transmission while preserving the reliability and call quality characteristics of E-carrier services
2Adaptability or versatility
If multiple E-carrier interfaces are provided to remote locations, then service capability is improved, but hardware changes or upgrades are required which increases complexity and cost
Solution Approach 1:
The patent implements a universal interface that can handle multiple E-carrier timeslots over a single DSL connection. The system provides multi-functionality by enabling the same hardware infrastructure to support various service configurations without requiring separate hardware for each interface, thereby improving service capability while avoiding hardware complexity and upgrades
Solution Approach 2:
The patent introduces a signaling interface and timeslot remapping mechanism as an intermediary between the E-carrier network and DSL infrastructure. This intermediary layer enables multiple E-carrier interfaces to be provided over existing DSL connections without direct hardware changes at remote locations, reducing both hardware complexity and deployment cost
Data Source
AI summary
A communication system comprises a first multiplexer card having a first plurality of TDM ports and a first differential signaling interface, the first multiplexer card operable to map timeslots from the TDM ports to a first combined signal transmitted via the first differential signaling interface; a first unit coupled to the first differential signaling interface and configured to map timeslots extracted from the first combined signal to a DSL frame; a second unit coupled to the first unit via the a DSL link, the second unit having a third differential signaling interface and operable to map timeslots extracted from the DSL frame to a second combined signal; and a second multiplexer card having a second plurality of TDM ports and a fourth differential signaling interface, the second multiplexer card operable to map each of the timeslots from the second combined signal to one of the second plurality of TDM ports.