The emergence of Ethernet as a appropriate technology for metro, access and campus networks has generated a high level of expectation among service providers, installers and final users for the provision of competitive VPN and Internet based applications. New fast-growing services such e-commerce, voice over IP (VoIP) applications, internet radio and telephony, and video on demand (VoD) are together pushing so strongly that core networks are also migrating to SDH NG to provide efficient and seamless Ethernet transport over longer distances.