Dual Port Pass-Through Midspan With DC Blocking Circuit
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Solution Overview
Problem
Existing midspan powering arrangements for data terminal equipment require multiple equipment pieces and cables, making them cumbersome and inefficient, especially for remote installations like surveillance cameras and wireless LAN access points, which often need AC mains power and direct wired connections.
Innovation Solution
A dual port pass through midspan with two Power Sourcing Equipment (PSE) ports, each providing power over two twisted wire pairs, and a direct current blocking circuit for unencumbered bi-directional data communication between connected devices, allowing for simplified installation with only a single AC mains connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional midspan powering arrangements are used with hub equipment, then power and data can be supplied to remote devices, but the system requires multiple equipment pieces and cables making installation cumbersome
Solution Approach 1:
The patent combines the midspan power injector and hub equipment into a single integrated device. The data connection between first and second ports passes through the midspan housing, eliminating the need for separate hub equipment and multiple cables. This merging reduces the number of equipment pieces from 4 to 1 while maintaining power and data functionality.
Solution Approach 2:
The midspan device performs multiple functions: it provides power injection to powered devices, enables data communication between connected devices, and acts as a pass-through connection point. The single device replaces multiple specialized equipment pieces, achieving multi-functionality that simplifies the overall system architecture.
2Quantity of substance
If separate hub equipment is used for data communication, then data can be transmitted, but the arrangement requires 4 distinct pieces of equipment and 4 data cables
Solution Approach 1:
The data communication path is integrated within the midspan housing. The data connection between first and second ports is established through the midspan itself, eliminating the need for external hub equipment and reducing cable requirements from 4 data cables to 2 cables connecting directly to the midspan ports.
3Device complexity
If power is provided over twisted wire pairs without isolation, then power delivery is simplified, but power injection between ports may interfere with each other
Solution Approach 1:
The midspan device divides the power delivery system into separate first and second ports with isolated power injection circuits. Each port has its own PSE that independently powers devices without interfering with the other port's power delivery, achieving segmentation that ensures reliability while maintaining simplified power delivery structure.
Data Source
AI summary
A dual port pass through midspan constituted of: a first port arranged for connection to a first data terminal equipment over a first data communication cabling; a second port arranged for connection to a second data terminal equipment over a second data communication cabling; a first power sourcing equipment arranged to inject power on two of the 4 wire pairs of the first data communication cabling; a second power sourcing equipment arranged to inject power on two of the 4 wire pairs of the second data communication cabling; and a data pass through connection arranged to pass high speed data signals between the first port to the second port, the data pass through connection comprising a direct current blocking circuit arranged to: prevent power from the first power sourcing equipment from appearing at the second port; and prevent power from the second power sourcing equipment from appearing at the first port.