Multiplex Switch Unit for Analog Digital Signal Routing
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Solution Overview
Problem
Distributed antenna systems (DASs) face challenges in scalability and compatibility when providing both analog and digital communications, requiring extensive reconfiguration of optical and electrical cable connections between head-end units and remote units, limiting expansion and scaling capabilities.
Innovation Solution
A multiplex switch unit configured to receive and assign both analog and digital signals to remote units, utilizing wave division multiplexing to combine and separate signals, allowing existing optical fiber networks to carry both types of communications on common fibers, enabling individual configuration and expansion of services as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical and electrical cable connections are provided between HEU and each RU to support both analog and digital communications, then compatibility with different technology protocols is improved, but device complexity and ease of operation deteriorate due to extensive redesign and routing requirements
Solution Approach 1:
The patent combines multiple separate cable connections (optical and electrical) into a single integrated optical fiber connection. The multiplex switch unit consolidates digital data signals and analog RF signals onto common optical fibers using wavelength-division multiplexing, eliminating the need for separate electrical cable connections between HEU and RUs.
Solution Approach 2:
The patent makes the optical fiber serve multiple functions by enabling it to carry both digital data services and analog RF communication signals simultaneously. The multiplex switch unit allows a single optical fiber connection to replace what previously required multiple separate connections for different signal types.
2Adaptability or versatility
If extensive reconfiguration of optical and electrical cables is performed to add bandwidth or channels, then adaptability is improved, but loss of time and productivity worsen due to system reconfiguration requirements
Solution Approach 1:
The patent implements a dynamic, reconfigurable system where the multiplex switch unit can electronically reassign wavelength channels and signal routes without physical cable reconfiguration. This allows the system to adapt to changing bandwidth and channel requirements through software-controlled switching rather than manual cable routing.
Solution Approach 2:
The patent establishes a flexible optical infrastructure with multiplexing capabilities built in from the beginning, allowing future expansion and service additions to be implemented through configuration changes rather than physical reinstallation of cables and equipment.
3Manufacturing precision
If separate cable connections are used for analog and digital signals, then manufacturing precision is improved, but ease of manufacture deteriorates due to installation complexity
Solution Approach 1:
The patent merges multiple signal transmission functions into a single optical fiber connection while maintaining signal integrity through wavelength-division multiplexing. The multiplex switch unit combines digital data signals and analog RF signals onto separate wavelength channels that travel simultaneously over the same optical fiber without interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous digital and analog services over optical fibers, improving scalability and compatibility without extensive reconfiguration, allowing for flexible service provision to meet demand in distributed antenna systems.
Implementation Method 1
a wave division multiplexer/demultiplexer associated with the multiplex switch unit can wave division multiplex component downlink signals into a combined downlink signal for remote side transmission, and to demultiplex received combined uplink signals into their component uplink signals
Implementation Method 2
The plurality of RUs convert incoming optical RF signals from an optical fiber downlink to electrical RF signals via optical-to-electrical (O/E) converters
Implementation Method 3
The plurality of RUs then convert the electrical RF signals to optical RF signals via electrical-to-optical (E/O) converters
Data Source
AI summary
Embodiments relate to providing simultaneous digital and analog services in optical fiber-based distributed radio frequency (RF) antenna systems (DASs), and related components and methods. A multiplex switch unit associated with a head-end unit of a DAS can be configured to receive a plurality of analog and digital downlink signals from one or more sources, such as a service matrix unit, and to assign each downlink signal to be transmitted to one or more remote units of the DAS. In one example, when two or more downlink signals are assigned to be transmitted to the same remote unit, a wave division multiplexer/demultiplexer associated with the multiplex switch unit can be configured to wave division multiplex the component downlink signals into a combined downlink signal for remote side transmission and to demultiplex received combined uplink signals into their component uplink signals for head-end side transmission.