DS0 Time Switch for Combined TDM and Packet Traffic
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Solution Overview
Problem
Telecommunication networks face challenges in efficiently transferring and cross-connecting Time-Division Multiplexed (TDM) voice flows within standalone nodes and distributed systems, requiring the maintenance of multiple protocols and interfaces, which is costly and complex.
Innovation Solution
A DS0 time switch is implemented, comprising an input buffer, reassembly state machine, frame buffer, and segmentation state machine, enabling cross-connection of DS0 pairs and transmission of data in a packet-based switching protocol, allowing for efficient data path creation in communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDM-based access devices and networks are deployed, then voice traffic can be efficiently transmitted, but they cannot handle packet-based data traffic effectively
Solution Approach 1:
The patent implements a universal packet-based switching protocol that can handle multiple data formats including TDM voice flows, ATM cells, and IP packets through a single protocol framework. The system uses a protocol converter that receives TDM voice flows and encapsulates them into packet-based format, allowing the same switching infrastructure to handle different traffic types without requiring separate TDM and packet networks
Solution Approach 2:
The patent introduces a protocol converter as an intermediary component that bridges TDM voice flows and packet-based networks. This converter encapsulates TDM voice data into packet format with appropriate headers, enabling seamless integration between legacy TDM systems and modern packet networks without requiring complete system replacement
2Reliability
If multiple protocols are maintained for TDM and packet networks, then existing infrastructure can be preserved, but the number of interfaces and system complexity increases
Solution Approach 1:
The patent merges TDM voice flow handling with packet-based switching by implementing a unified switching fabric that processes both types of traffic through a single protocol. The system combines the TDM interface, protocol conversion function, and packet switching capability into one integrated device, eliminating the need for separate TDM and packet network interfaces
Solution Approach 2:
The switching protocol is designed to be universal, capable of transporting TDM voice flows, ATM cells, and IP packets through the same network infrastructure. This multi-functional approach allows a single interface to replace multiple specialized interfaces, reducing system complexity while maintaining reliable communication across different protocol domains
3Adaptability or versatility
If TDM networks are replaced with ATM-based access devices, then packet-based data traffic can be handled efficiently, but immense expense is required
Solution Approach 1:
The patent employs cost-effective protocol conversion and encapsulation techniques that allow existing TDM infrastructure to be leveraged rather than completely replaced. By using software-based protocol conversion and standard packet switching components, the system achieves packet-based data traffic handling capability without the immense expense of deploying entirely new ATM-based access devices
Solution Approach 2:
The patent changes the protocol parameter representation of TDM voice flows by encapsulating them in packet-based format with appropriate headers and delimiters. This parameter transformation allows the same physical infrastructure to carry both traditional TDM voice traffic and modern packet-based data traffic, providing versatility without requiring expensive hardware replacement
Data Source
AI summary
Apparatus implements combined packetized time-division multiplexed (TDM) streams and TDM cross connect functions. The apparatus includes an input buffer, a reassembly state machine, a frame buffer, and a segmentation state machine. The frame buffer includes multiple bins for storing cell data. The segmentation state machine retrieves information from the bins as associated with each DS0 and assembles output cells for transmitting output DS0s. The cells may be in asynchronous transfer mode (ATM) format, allowing a single ATM backplane to be used for voice signals, data signals, and combined voice/data signals. Various types of ATM cell formats are supported.