The DPT Interface Processor (DPTIP) is a dual-width OC-12c interface processor based on VIP2 technology that provides shared IP over SONET capability in Cisco 7500 series routers.The DPTIP provides Cisco 7500 series routers with two SC duplex ports. Each SC duplex port provides the physical connection to an adjacent device in a DPT ring. The DPTIP is designed to be deployed in SONET OC-12 DPT rings. DPT rings can also be connected to SONET Add Drop Multiplexers (ADMs), thus allowing for the creation of small, or very large DPT rings.