ROADM architectures evolve to meet metro needs:PMC-Sierra 提供了用于MSPP 和ROADM线卡和交换结构最广泛的解决方 案组合:用于集合、修饰和传输SONET/SDH 通信量的CHESSTM III 芯片集,用 于VT/TU 指示器处理和修饰的CHESS 宽带芯片集,用于将Ethernet 通信量映射 到SONET/SDH 的Ethernet over SONET/SDH (EoS)产品系列。 关键词:PMC ,ROADM,switch fabrics,MSPP,SONET/SDH Introduction The build-out of optical networks started in the late 1990s in North America and Europe. Today, the majority of optical network infrastructure build-out is happening in India, China and the APAC nations where customers are also demanding GSM/3G, WiMAX, PON, Gigabit Ethernet & IP-WAN services.