NTIA issues this Notice of Inquiry on behalf of the First Responder Network Authority (FirstNet) to seek public comment on the conceptual network architecture presentation made at the FirstNet Board of Directors’ meeting held on September 25, 2012, as well as to invite input on other network design and business plan considerations. NTIA also seeks comment on the general concept of how to develop applications for public safety users as discussed at the FirstNet Board meeting. FirstNet intends to use the input received from this process to shape its efforts to establish the interoperable public safety broadband network based on a single, nationwide network architecture called for under the Middle Class Tax Relief and Job Creation Act of 2012 (Act).