TDM Clock Frequency Multiplexing for SONET Management Channels
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Solution Overview
Problem
SONET/SDH systems require a large number of TDM slots to support management channels, making existing HDLC controllers cost-ineffective for systems with over 150 optical ports, as they need 450 slots to support 150 DCCR channels, necessitating either a higher-end processor or additional controllers.
Innovation Solution
Increasing the TDM clock frequency to support more management channels within the same number of TDM slots by operating at predefined higher rates, allowing for efficient packing of data across multiple TDM buses, thereby reducing the number of required slots and hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDM based HDLC controller is used to support management channels in SONET/SDH systems, then management channel support is provided, but the number of TDM slots required increases linearly with the number of optical ports, making the system cost-ineffective for large-scale deployments
Solution Approach 1:
The patent merges multiple DCCR channels into a single TDM slot by implementing a multiplexing architecture where multiple management channel data streams are combined and transmitted over shared TDM resources. This allows one TDM slot to carry multiple DCCR channels simultaneously, reducing the total number of slots required from 450 to a much smaller number for 150 optical ports.
Solution Approach 2:
The patent makes TDM slots universal by enabling them to serve multiple management channel functions simultaneously. A single TDM slot can dynamically support multiple DCCR, DCCM, and GCC channels across different optical ports, rather than being dedicated to a single management channel. This multi-functional approach dramatically reduces the total slot requirement.
2Adaptability or versatility
If the number of optical ports is increased to support larger network scale, then network coverage and capacity are improved, but the number of required TDM slots increases proportionally, necessitating higher-end processors or additional controllers
Solution Approach 1:
The patent segments the management channel data streams from multiple optical ports and multiplexes them into fewer TDM slots. Instead of requiring dedicated slots for each port's management channel, the system divides and combines these streams efficiently, allowing a single controller to handle management channels for many more ports without proportional increases in slot count or controller complexity.
Solution Approach 2:
The patent introduces a new dimension of multiplexing by combining multiple management channel types (DCCR, DCCM, GCC) from multiple optical ports into shared TDM slots. This dimensional approach to resource allocation allows the system to scale to larger network sizes without linearly increasing controller complexity or slot requirements.
Data Source
AI summary
Embodiments of the disclosure relate to a method and system for enhancing management channels. The method comprises operating TDM (Time Division Multiplex) clock frequency at a predefined rate higher than operating frequency based on available management channels. Transmitting data on the management channels using the TDM slots of a TDM based controller at a higher frequency rate.