Ciena’s Virtual Container over Packet Transceivers enable cost-effective transport of T3 (DS3), OC-3/STM-1, and OC-12/STM-4 signals over Ethernet. With many network operators transforming their networks to IP/MPLS transport, TDM over packet emerges as a key enabler to efficiently migrate legacy services to the new IP/MPLS infrastructure. Using a single unified network for both data and TDM transport can streamline operations and reduce capital and operational expenditures.