To access the NPA-NXX to LATA Information (NXL) page, from the Landing page or any page, the user can select the Menu icon (in the upper left corner), the “General System Administration” menu item and then the “NPA-NXX-LATA Information” sub-menu item. Once the “NPA-NXX-LATA Information” sub-menu item has been selected, the NXL page will be displayed.
The NXL page provides information related to the Geographic NPA-NXXs. The TFNRegistry™ needs the NXL reference data to map a Plain Old Telephone Serivce (POTS) NPA-NXX to a given LATA. It is also required to associate an Operating Company Number (OCN) code, Company Code (CO), and Effective Date with the NPA-NXX. These values are set according to externally provided information and can therefore change periodically.
The TFNRegistry provides the NXL page to you, a Responsible Organization (Resp Org) user, so you can view the current data for an NPA-NXX.