Packet Network TDM Termination via Virtual Facility Aggregation
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Solution Overview
Problem
Existing solutions for carrying TDM traffic over packet networks either relay the traffic to another TDM network or only support termination on a per DS-0 basis, failing to provide comprehensive TDM services within the packet network.
Innovation Solution
A method to terminate TDM traffic within a packet network as a combined TDM facility, using protocols like ATM or IP to segment and encapsulate TDM channels, allowing for virtual T1/E1, T3/E3 services without dedicated TDM equipment, and enabling seamless upgrade of TDM networks to packet networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If TDM traffic is carried over packet networks using existing solutions, then cost reduction is achieved, but TDM terminating services cannot be provided within the packet network
Solution Approach 1:
The patent introduces a packet network as an intermediary medium to carry TDM traffic, while implementing TDM emulation functionality within the packet network nodes. This allows the packet network to act as both a cost-effective transport medium and a functional TDM network, eliminating the need for separate dedicated TDM infrastructure while maintaining full TDM service capabilities including termination, switching, and signaling.
2Reliability
If dedicated TDM equipment is used to provide TDM services, then service reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements multi-functionality by enabling packet network nodes to perform both packet switching and TDM emulation functions simultaneously. The same network infrastructure provides both IP-based services and TDM services, eliminating the need for separate dedicated TDM equipment while maintaining service reliability through proven packet network architecture.
Solution Approach 2:
The patent creates virtual copies of TDM facilities within the packet network by emulating TDM characteristics (timing, synchronization, channel structure) over packet switches. These virtual T1/E1 lines replicate the functionality of physical TDM equipment without requiring actual dedicated TDM hardware, thereby reducing complexity while maintaining reliability.
3Ease of operation
If TDM channels are terminated on a per DS-0 basis, then service granularity is improved, but inability to provide combined TDM facilities limits service versatility
Solution Approach 1:
The patent combines multiple individual DS-0 channel terminations into aggregated virtual T1/E1 facilities within the packet network. By merging individual channel handling capabilities with multi-channel aggregation functions, the system provides both fine-grained per-channel control and higher-level combined facility services, enabling versatile TDM service delivery without requiring separate equipment for different service levels.
Data Source
AI summary
The subject matter described herein includes methods, systems, and computer program products for providing TDM terminating services in a packet network. According to one method, a combined set including a plurality of TDM channels is received over a packet network. The combined set of TDM channels is terminated in the packet network as a combined TDM facility. Terminating the TDM channels as a combined TDM facility may include providing at least one terminating TDM service for the TDM channels, such as performing CAS signaling or providing a PRI interface for the TDM channels.