SDH接口在宽带交换中的研究与实现
摘要
随着通信市场日趋宽带化和数字化,传统的以语音业务为基础的采用电路交换方式的交换网络已无法适应新的发展趋势。开发下一代的可持续发展的网络已成为电信界的共同心愿。下一代网络将是一个以软交换为核心、光网络和分组型传送技术为基础的开放式融合网。然而在下一代网络还未成熟以前,如何对现有网络进行优化改造并逐步实现向新一代网络平滑演进就成为了通信领域的一个课题。本文从现有的基于SDH的技术着手,提出了一种向NGN平滑演进的工程应用设计,为实现SDH直接接入提出了一种可行的工程解决方案。
本课题是在NGS交换平台的基础上研究的,新增了SDH接入部分的功能,从而在NGS平台上实现了SDH的直接接入。NGS是一个能实现向NGN平滑演进的宽带交换系统。它是一个基于多时隙信元MSC的MPSR宽带交换网络,拥有多路径自选路由的能力,其内部交换独立于外部业务。NGS采用全分散控制,使各种功能可方便地分散于不同的模块中。增加新的功能模块就能方便地引入新的业务。因此设计中应用了NGS全分散和外部业务独立于内部交换的特点,在其系统中增加了一个新的宽带链路模块,该模块实现把SDH网络节点传送来的STM-1转换成MPSR内部的格式,使得NGS实现了SDH的直接接入。
本设计侧重的是SDH线路终结模块和TDM-MSC交互模块的设计以及最终的硬件测试方案设计。SDH线路终结模块主要完成SDH的终结功能以实现SDH的接入,它包括SDH的终结、自动保护切换、时钟恢复、时钟传输和数据恢复等几个部分。该模块除了采用PMC-Sierra的商用芯片集2*PM5316和4*PM8316实现SDH的接入以外,还引入了1+1 APS保护机制,进一步提高了系统的安全性和容错性。TDM-MSC交互模块完成TDM和MSC格式之间的转换,以实现数据在MPSR交换网络内的交换。该模块采用了两块FPGA芯片来实现其交互逻辑。硬件测试则根据工厂生产方便、快捷的要求,给出了完整的测试方案。而实验数据表明,设计是成功的。
With the trend of broadbandization and digitization in communication market, the traditional switched network which bases on PSTN can not meet new developing requirement. Developing Next Generation durative-developing Network has been the common expectation in Telecommunication field. NGN which bases on optical network and distributed transmission technology will be a researchful integrated network with hardcore“soft switch”. However, before mature NGN come into being, how to optimize the current network and make it steadily work up to NGN has been a task in telecommunication domain.This article launched on the current SDH technology and raised an engineering application design which set up a feasible engineering solution for implementing SDH directly access and finally realize the smoothly evolvement into NGN.
We research this task based on NGS switching system, adding SDH access function, thereby carry out the SDH directly access on NGS. NGS is a switching system which can realize smoothly evolvement to NGN. It possesses MPSR broadband switch network with Multi-slot Cell and ability of Multi-path self-routing. The internal switch function of NGS is independent of external service. NGS adopt the full-separate-control mode which can conveniently integrate kinds of function into varied modules, so new service can be easily introduced by adding new function modules. For the NGS characteristic of“the full-separate-control mode”and“the internal switch function of NGS is independent of external service”, we add a broadband module in NGS system in design phase. This module makes NGS realize SDH directly access by translating STM-1 format from SDH network node to MPSR internal format.
This design focus on the design of SDH line termination and TDM-MSC interworking module and final hardware test solution.SDH line termination module implements SDH termination function for SDH access, including following parts: SDH termination, automatic protection switch, clock recovery, transmit clock and data recovery, ect. Besides adopting PMC-Sierra commercial chipset 2*PM5316 and 4*PM8316 for SDH access, we also introduce 1+1 APS to this module for enhancing system ability of security and error toleration. TDM-MSC interworking module can implement the format conversion between TDM and MSC to realize the data switching in MPSR switch network. This module carries out interactive logical by two FPGA chips. According to the requirement from manufactory of expeditiousness and convenience, the hardware test has been given the completive solution and the experiment data show that is a successful design.
本课题是在NGS交换平台的基础上研究的,新增了SDH接入部分的功能,从而在NGS平台上实现了SDH的直接接入。NGS是一个能实现向NGN平滑演进的宽带交换系统。它是一个基于多时隙信元MSC的MPSR宽带交换网络,拥有多路径自选路由的能力,其内部交换独立于外部业务。NGS采用全分散控制,使各种功能可方便地分散于不同的模块中。增加新的功能模块就能方便地引入新的业务。因此设计中应用了NGS全分散和外部业务独立于内部交换的特点,在其系统中增加了一个新的宽带链路模块,该模块实现把SDH网络节点传送来的STM-1转换成MPSR内部的格式,使得NGS实现了SDH的直接接入。
本设计侧重的是SDH线路终结模块和TDM-MSC交互模块的设计以及最终的硬件测试方案设计。SDH线路终结模块主要完成SDH的终结功能以实现SDH的接入,它包括SDH的终结、自动保护切换、时钟恢复、时钟传输和数据恢复等几个部分。该模块除了采用PMC-Sierra的商用芯片集2*PM5316和4*PM8316实现SDH的接入以外,还引入了1+1 APS保护机制,进一步提高了系统的安全性和容错性。TDM-MSC交互模块完成TDM和MSC格式之间的转换,以实现数据在MPSR交换网络内的交换。该模块采用了两块FPGA芯片来实现其交互逻辑。硬件测试则根据工厂生产方便、快捷的要求,给出了完整的测试方案。而实验数据表明,设计是成功的。
With the trend of broadbandization and digitization in communication market, the traditional switched network which bases on PSTN can not meet new developing requirement. Developing Next Generation durative-developing Network has been the common expectation in Telecommunication field. NGN which bases on optical network and distributed transmission technology will be a researchful integrated network with hardcore“soft switch”. However, before mature NGN come into being, how to optimize the current network and make it steadily work up to NGN has been a task in telecommunication domain.This article launched on the current SDH technology and raised an engineering application design which set up a feasible engineering solution for implementing SDH directly access and finally realize the smoothly evolvement into NGN.
We research this task based on NGS switching system, adding SDH access function, thereby carry out the SDH directly access on NGS. NGS is a switching system which can realize smoothly evolvement to NGN. It possesses MPSR broadband switch network with Multi-slot Cell and ability of Multi-path self-routing. The internal switch function of NGS is independent of external service. NGS adopt the full-separate-control mode which can conveniently integrate kinds of function into varied modules, so new service can be easily introduced by adding new function modules. For the NGS characteristic of“the full-separate-control mode”and“the internal switch function of NGS is independent of external service”, we add a broadband module in NGS system in design phase. This module makes NGS realize SDH directly access by translating STM-1 format from SDH network node to MPSR internal format.
This design focus on the design of SDH line termination and TDM-MSC interworking module and final hardware test solution.SDH line termination module implements SDH termination function for SDH access, including following parts: SDH termination, automatic protection switch, clock recovery, transmit clock and data recovery, ect. Besides adopting PMC-Sierra commercial chipset 2*PM5316 and 4*PM8316 for SDH access, we also introduce 1+1 APS to this module for enhancing system ability of security and error toleration. TDM-MSC interworking module can implement the format conversion between TDM and MSC to realize the data switching in MPSR switch network. This module carries out interactive logical by two FPGA chips. According to the requirement from manufactory of expeditiousness and convenience, the hardware test has been given the completive solution and the experiment data show that is a successful design.
引文
[1] 陈建亚、余浩,软交换与下一代网络,北京邮电大学出版社
[2] 初探向一代网络(NGN)平滑演进之路,电信技术,2002 年第 8 期
[3] 将 PSTN 引入下一代网络,上海贝尔服务月刊,2002 年 3 月
[4] 多业务宽度交换,中国通信网,1999 年 12 月
[5] 韦乐平,向以软交换为核心,光联网为基础的下一代网络演进,电信科学,2002年 1 月
[6] 雷震洲,期待中的下一代网,电信科信,2002 年 1 月
[7] 韦乐平,光同步数字传输网,人民邮电出版社
[8] Alcatel,Synchronous Digital Hierarchy,Edition3:1999
[9] CCITT Rec. G709, Synchronous multiplexing structure,1990
[10] CCITT Rec. G707, Synchronous digital hierarchy bit rates,1990
[11] Alcatel ,Switching Network in 155 Mbit/s MPSR Technology,Edition3:2000
[12] Alcatel,P3S System,Edition 1:2002
[13] PMC-Sierra,PM5316 SPECTRA4×155 SONET/SDH Payload Extractor/Aligner Datasheet,Version5:September 2002
[14] PMC-Sierra,PM8316 TEMUX84 High Density T1/E1 Framer with Integrated VT/TU Mapper and M13 Multiplexer Datasheet,Version 8: January 2003
[15] VITESSE,VSC8115 155Mbps,622Mbps Clock and Data Recovery Datasheet, Version4.3: October 12,2004
[16] ON Semiconductor,MC100LVELT22 3.3V Dual LVTTL/LVCMOS to Differential LVPECL Translator Datasheet,Version2: March 2003
[17] TEXAS INSTRUMENTS,SN74ALVCH16271 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER WITH 3-STATE OUTPUTS Datasheet,September 2004
[18] ZARLINK,MT90868 High Bandwidth Digital Switch Datasheet,January13, 2003
[19] XILINX,Virtex-II 1.5V Field-Programmable Gate Arrays Product Specification, Version1.9: September 26,2002
[20] XILINX,XC9572 In-System Programmable CPLD Product Specification, Version4.0: June 18,2003
[21] ADM,AM79C973 Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY Datasheet,August 2002
[22] Marvell,88E6052 Integrated 5 or 7 port QoS 10/100 Ethernet Switch Datasheet
[23] ASIC MTRC-2B Design Specification,Edition 3:May 22,2003
[24] Alcatel,MSE Design Specification,Edition1:May 2001
[2] 初探向一代网络(NGN)平滑演进之路,电信技术,2002 年第 8 期
[3] 将 PSTN 引入下一代网络,上海贝尔服务月刊,2002 年 3 月
[4] 多业务宽度交换,中国通信网,1999 年 12 月
[5] 韦乐平,向以软交换为核心,光联网为基础的下一代网络演进,电信科学,2002年 1 月
[6] 雷震洲,期待中的下一代网,电信科信,2002 年 1 月
[7] 韦乐平,光同步数字传输网,人民邮电出版社
[8] Alcatel,Synchronous Digital Hierarchy,Edition3:1999
[9] CCITT Rec. G709, Synchronous multiplexing structure,1990
[10] CCITT Rec. G707, Synchronous digital hierarchy bit rates,1990
[11] Alcatel ,Switching Network in 155 Mbit/s MPSR Technology,Edition3:2000
[12] Alcatel,P3S System,Edition 1:2002
[13] PMC-Sierra,PM5316 SPECTRA4×155 SONET/SDH Payload Extractor/Aligner Datasheet,Version5:September 2002
[14] PMC-Sierra,PM8316 TEMUX84 High Density T1/E1 Framer with Integrated VT/TU Mapper and M13 Multiplexer Datasheet,Version 8: January 2003
[15] VITESSE,VSC8115 155Mbps,622Mbps Clock and Data Recovery Datasheet, Version4.3: October 12,2004
[16] ON Semiconductor,MC100LVELT22 3.3V Dual LVTTL/LVCMOS to Differential LVPECL Translator Datasheet,Version2: March 2003
[17] TEXAS INSTRUMENTS,SN74ALVCH16271 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER WITH 3-STATE OUTPUTS Datasheet,September 2004
[18] ZARLINK,MT90868 High Bandwidth Digital Switch Datasheet,January13, 2003
[19] XILINX,Virtex-II 1.5V Field-Programmable Gate Arrays Product Specification, Version1.9: September 26,2002
[20] XILINX,XC9572 In-System Programmable CPLD Product Specification, Version4.0: June 18,2003
[21] ADM,AM79C973 Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY Datasheet,August 2002
[22] Marvell,88E6052 Integrated 5 or 7 port QoS 10/100 Ethernet Switch Datasheet
[23] ASIC MTRC-2B Design Specification,Edition 3:May 22,2003
[24] Alcatel,MSE Design Specification,Edition1:May 2001