As a definition specific to MSOs (cable company), a service area boundary typically follows municipal boundaries and/or zip code boundaries, whereby the MSO is legally obligated through franchise agreements to provide services to the entire municipality. Most telcos network follows the Public Utilities Commission Boundaries, not municipal boundaries. This has created multiple legal battles between MSO and LECs attempting to provide Video services. The Warren study will have all the cable/MSO boundary information. Traditionally, Service Area Boundaries were called Hubs which generally followed city boundaries (geographical data), within the hubs there are nodes (equipment). These nodes typically feed 400 to 1000 homes passes. Finally, an arbitrary grid (geographical) data was overlaid on the homes passed. Therefore, every customer had a hub, node and grid number. Given the cumbersome nomenclature and its limited usefulness, it has been abandoned. See Geographical Information Systems (GIS).