Fax Relay Tunneling for Circuit-Switched Network Delay Reduction
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Solution Overview
Problem
Real-time fax relay systems experience excessive transmission delays due to network conversions and bandwidth constraints, leading to indefinite 'hold off' conditions in IP gateways, which lock up the communication process.
Innovation Solution
Implementing fax relay tunneling through a circuit-switched network, where packetized fax relay data is transmitted directly between gateways without conversion to analog signals, reducing overall transmission delay by bypassing unnecessary conversions and de-jitter buffering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If packetized fax relay data is converted to analog signals for transmission through circuit-switched networks, then compatibility with legacy networks is maintained, but transmission delay increases excessively
Solution Approach 1:
The patent extracts the fax relay data from the packet-switched network domain and transmits it through a dedicated tunnel in the circuit-switched network, bypassing the need for conversion to analog signals. This extraction approach maintains compatibility with legacy circuit-switched networks while avoiding the time-consuming demodulation and remodulation processes that cause excessive delay.
Solution Approach 2:
The patent introduces a tunnel as an intermediary transmission path between packet-switched and circuit-switched networks. This tunnel allows packetized fax relay data to traverse the circuit-switched network without conversion, acting as a mediator that preserves data integrity and minimizes transmission delay while maintaining compatibility with legacy network infrastructure.
2Adaptability or versatility
If multiple tandemly coupled networks are used for fax transmission, then network coverage and connectivity are improved, but transmission delay increases with each conversion point
Solution Approach 1:
The patent segments the transmission path by creating a dedicated tunnel through the circuit-switched network portion of the tandemly coupled networks. This segmentation allows packetized fax relay data to bypass conversion points at each network boundary, reducing the cumulative transmission delay that would otherwise increase with each additional network conversion.
3Productivity
If IP gateways use spoofing to force hold off of retransmissions, then bandwidth constraints are managed, but real-time fax relay locks up indefinitely
Solution Approach 1:
The tunnel acts as an intermediary that preserves the timing characteristics of real-time fax relay data throughout the circuit-switched network portion of the transmission path. By maintaining packetized data integrity and avoiding analog conversion, the tunnel ensures that retransmission timing remains predictable and reliable, preventing the indefinite lock-up conditions that occur with traditional spoofing approaches.
Data Source
AI summary
A system comprising a first network gateway coupled to a circuit-switched network, the first network gateway to initiate a tunnel through the circuit-switched network responsive to packetized fax relay data received from a packet-switched network, and a second network gateway couple to the circuit-switched network, the second network gateway to receive packetized fax relay data through a tunnel over the circuit-switched network from the first network gateway.