sentations of data and generally employs "point and click" functionality. Host Digital Terminal (HDT): Network equipment located in the head-end or end office that supports and delivers service to and from lines or circuits that connect to end customers. The Ultimate Guide to Building and Delivering OSS/BSS Home Location Register (HLR): A database that stores information about those customers that are considered home or native users to a specific mobile network. These databases play a critical role in mobile service roaming. Hybrid fiber-coaxial networks: The networks cable operators employ. These networks generally consist of high-capacity, fiber-based cores connected to coaxial cable-based networks that serve end user locations. Integrated Access Device (IAD): End user serving equipment that supports voice, data and video connectivity for various network technologies, all in one platform. IIOP - Internet Inter-ORB Protocol: Part of the CORBA-standard. CORBA objects can communicate on a single machine or across a network. IIOP is the CORBA-standard protocol that enables CORBA to operate over a network. Integration Data Model: A model an IIC would develop to define which OSS applications are responsible for which data and to define how data should flow among the various applications before engaging in an integration project. Interconnect or interconnection gateways: The OSSs an IIC employs for interfacing to and managing communications with other providers. Most often, interconnect gateways support connections between competitive and incumbent voice services providers. Electronic Data Interchange (EDI): A protocol used to encode and transmit business documents. Internet Infrastructure Companies (IICs): A forward-looking term to describe those communications service providers that supply the underlying networks and technologies that make up the Internet and related communications networks. Internet Protocol (IP): The method of network communication on which the Internet is based. IP encapsulates data into packets 