随着“巴统”的解散,世界各大通信厂家都把眼光瞄准了中国,各种新的电信技术、电信产品纷至沓来,令人目不暇接.在电信的交换、传输、终端这三大技术市场中,近期尤以光同步传输网(SDH)的技术为热.因为它是属于二十一世纪的电信传输技术,有关专家预料:下一世纪邮电通信提供的“信息高速公路”的平台将是“ATM+SDH”.目前,在国内已试开通或即将开通的一级干线的SDH试 With the dissolution of “Batumi”, the world’s major telecommunications manufacturers have set their sights on China, and new telecommunications technologies and telecom products are coming in dizzying streams. In the three major technology markets for exchange, transmission and terminal telecommunications Recently, the technology of optical synchronous transmission network (SDH) is especially hot because it belongs to the telecommunication transmission technology of the 21st century. Experts predict that the platform of “information superhighway” provided by post and telecommunication in the next century will be “ ATM + SDH. ”At present, the SDH test of the first-level trunk lines that have been or will be launched in China