Twisted Pair Service Isolation for POTS and Reverse Power Supply
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Solution Overview
Problem
In Fiber to the Distribution Point (FTTDp) systems, the coexistence of reverse power supply and normal operation of Plain Old Telephone Services (POTS) is challenging due to interference between direct current voltages and low-frequency signals from POTS telephone equipment and reverse power supply on twisted pairs, leading to compatibility issues.
Innovation Solution
Implementing service isolation using physical division methods such as time division, frequency division, or line space division on twisted pairs between the Distributed Point Unit (DPU) and network adapters to segregate POTS and reverse power supply services, ensuring they do not interfere with each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If reverse power supply is implemented on twisted pair to power DPU, then power supply capability is improved, but interference with POTS telephone equipment occurs due to coexistence of direct current voltages and low-frequency signals
Solution Approach 1:
The twisted pair transmission medium is segmented into multiple independent channels: a first channel dedicated to reverse power supply and a second channel dedicated to POTS voice services. This physical separation eliminates interference between the direct current power signals and low-frequency voice signals by assigning them to distinct transmission paths within the same twisted pair cable.
2Reliability
If dedicated electric wire is laid from public power supply to DPU, then stable power supply is achieved, but system deployment cost increases
Solution Approach 1:
The twisted pair cable is designed to serve multiple functions simultaneously: it provides both power transmission (reverse power supply from user equipment to DPU) and voice communication (POTS services). This multi-functionality eliminates the need for separate dedicated power wiring, reducing deployment complexity and cost while maintaining reliable power supply to the DPU.
3Device complexity
If user-end equipment reversely supplies power to DPU through twisted pair, then FTTH implementation cost is reduced, but compatibility with existing POTS voice equipment becomes difficult
Solution Approach 1:
The transmission channels are segmented into separate first and second channels within the twisted pair. The first channel carries reverse power supply signals while the second channel carries POTS voice signals. This segmentation allows user-end equipment to reverse supply power without interfering with existing POTS telephone equipment, maintaining full compatibility while reducing FTTH implementation costs.
Solution Approach 2:
The channel separation mechanism acts as an intermediary that mediates between the reverse power supply function and the POTS voice function. By routing power signals through the first channel and voice signals through the second channel, the system enables both functions to coexist without direct interference, preserving compatibility with legacy POTS equipment.
Data Source
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AI summary
Provided are a method, device and system for isolating services, a Distributed Point Unit (DPU), a network adapter. The method includes that: a physical division manner, used for service isolation, of a twisted pair connected between a DPU on an access network side and a network adapter on a user side is determined, wherein the physical division manner includes at least one of: a time division manner, a frequency division manner and a line space division manner; and isolation processing is performed, according to the determined physical division manner, on a Plain Old Telephone Service (POTS) and a reverse power supply service executed on the DPU by user-side equipment, which are transmitted on the twisted pair. By such a method, the problem that the POTS and the reverse power supply service executed on the DPU by the user-side equipment, which are transmitted on the twisted pair, may not coexist in the related art is solved, and the effect of improving a user experience is further achieved.