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随着国家 863项目“大容量混合数字程控交换系统平台 HJD04E“及其关键技术“大容量光纤直连复制 T交换网络 OCTN”的研制成功并投入商用，巨龙公司为我国新时期通信网的高速发展和合理优化提供了一条从单纯电路交换到电路 /分组混合交换平滑过渡的有效解决方案。本文将从 HJ004E系统的功能特点、性能指标、组网能力等方面进行全面的介绍。
With the successful development and commercial application of National 863 Project “High-capacity Hybrid Digital Program-controlled Switching System Platform HJD04E” and its key technology, “High-capacity Optical Fiber Direct-connect Copy T-switched Network OCTN” The rapid development and rational optimization provides an effective solution to the smooth transition from pure circuit switching to circuit / packet hybrid switching. This article will be HJ004E system features, performance indicators, networking capabilities and other aspects of a comprehensive introduction.