Business and consumers are adopting Ethernet technology at an astounding pace. To keep up with demand and best utilize existing SONET based network infrastructures, Service Providers need cost-effective products to bridge the gap between Ethernet delivery and existing TDM backbone networks with currently tariffed transport circuits. The MX3112 is designed to address that need.The MX3112 maps Ethernet across DS1 or DS3 facilities to enable Ethernet service delivery over currently tariffed copper facilities. In its copper application mode, the MX3112 provides up to twelve DS1 ports that can be bonded for transporting the traffic of up to four client Ethernet ports. In its DS3 application mode, the MX3112 provides DS3 service for transporting the traffic of up to four client Ethernet ports and up to 12 client DS1 ports. Its compact 1 RU size minimizes space allocation and provides for dense utilization.