# US 10,771,598 B2 · Autonomous mode fixed station interface for legacy base station equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,598 B2 - Document ID: US10771598B2 - Status: Granted - Kind: B2 - Application number: 16/691,001 - Filed: 2019-11-21 - Published: 2020-04-09 - Granted: 2020-09-08 - Earliest claimed: 2014-04-07 - Assignees: The Government of the United States of America, as represented by the Secretary of Homeland Security - Applicants: The Government of the United States of America, as represented by the Secretary of Homeland Security - Inventors: Richard Brockway - Web page: https://patentgrep.com/patent/US10771598B2 ## CPC - H04L 69/22: Parsing or analysis of headers - H04L 69/08: Protocols for interworking; Protocol conversion - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Various embodiments are directed toward a system and method pertaining to an interface device for provisioning Internet Protocol (IP) communications to be established for base station equipment that employ proprietary device specific protocols. In a conversion mode, a fixed station interface (FSI) translates between a V.24 High-Level-Data-Link Control (HDLC) protocol used for external data connections on base station equipment to a Voice-Over-Internet-Protocol (VOIP) open-standard protocol. In an autonomous mode, the FSI establishes a connection to at least one base station or other FSI automatically without the involvement of a dispatch console. Upon being deployed in First Responder communications networks (that use legacy base station equipment), the FSI provisions for the retention of existing installed base station equipment while providing a low-cost solution to support VOIP communications interconnectivity and reliability, thereby enhancing the effectiveness and safety of the First Responder systems. ## Claims ### Claim 1 A method for a fixed station interface (FSI) of a communication system to operate in a plurality of modes comprising: transforming a V.24 message according to a conversion mode, comprising: discarding, by a microcontroller of the FSI, a portion from a key-up command of a High-Level Data Link Control Protocol V.24 message from a data stream, the key-up command received prior to a header data unit and separated from the header data unit by at least a message bytes number indicator and a check indicator in the data stream that forms the V.24 message; and transforming, by the microcontroller, the V.24 message with the discarded portion removed into an open-standard VoIP-based TIA-102.BAHA and Draft TIA-102.BAHA-A Project 25 compliant format; and supporting connections between systems according to an autonomous mode comprising: establishing, by the microcontroller, a connection to at least one base station or other FSI automatically without involvement of a dispatch console. ### Claim 2 (depends on 1) The method of claim 1, wherein the connection is associated with a plurality of different IP addresses for control messages, voice messages, and data messages. ### Claim 3 (depends on 1) The method of claim 1, wherein the connection is configured to support VoIP messages. ### Claim 4 (depends on 1) The method of claim 1, wherein the connection is configured to provide an IP transport for a High-Level Data Link Control protocol (HDLC) message without transforming the HDLC message into the open-standard VoIP-based TIA-102.BAHA and Draft TIA-102.BAHA-A Project 25 compliant format. ### Claim 5 (depends on 4) The method of claim 4, further comprising encrypting the HDLC message carried by the connection. ### Claim 6 (depends on 5) The method of claim 5, further comprising encrypting the HDLC message. ### Claim 7 A method for communication according to a plurality of modes comprising: transforming a received message according to a conversion mode, comprising: mapping data that forms the received message that is compliant with V.24 High-Level Data Link Control protocol format into a transformed message compliant with VoIP-based TIA-102.BAHA and Draft TIA-102.BAHA-A Project 25 format, wherein mapping includes discarding a portion from a key-up command received prior to a header data unit and separated from the header data unit by at least a message bytes number indicator and a check indicator in a data stream that forms the received message; and transmitting the transformed message to external equipment; and supporting connections between systems according to an autonomous mode comprising: establishing a connection to at least one base station or fixed station interface (FSI) automatically without involvement of a dispatch console, wherein the connection is configured to carry control messages, voice messages, and data messages. ### Claim 8 (depends on 7) The method of claim 7, wherein the connection is associated with a plurality of different IP addresses for the control messages, voice messages, and data messages. ### Claim 9 (depends on 7) The method of claim 7, wherein the connection is configured to provide an IP transport for a High-Level Data Link Control protocol (HDLC) message without transforming the HDLC message into the VoIP-based TIA-102.BAHA and Draft TIA-102.BAHA-A Project 25 format. ### Claim 10 (depends on 9) The method of claim 9, further comprising encrypting the HDLC message carried by the connection. ### Claim 11 A fixed station interface (FSI) configured to interface with a base station, comprising: a physical first interface configured to permit communication with a base station that is able to communicate via a proprietary protocol based on High-Level Data Link Control protocol V.24 messages; a physical second interface that is internet protocol compliant; circuitry configured to communicate with the physical first interface and the physical second interface, the circuitry being configured to: transform, according to a conversion mode, a V.24 message received via the physical first interface, comprising discarding portions from a key-up command, the key-up command received prior to a header data unit and separated from the header data unit by at least a message bytes number indicator and a check indicator of a data stream that forms the V.24 message, to generate a translated message compliant with VoIP-based TIA-102.BAHA and Draft TIA-102.BAHA-A Project 25 format; and support connections between systems according to an autonomous mode, comprising establishing, by the circuitry, a connection from the physical second interface to at least one base station or other FSI automatically without involvement of a dispatch console. ### Claim 12 (depends on 11) The fixed station interface of claim 11, wherein the connection is associated with a plurality of different IP addresses for control, VoIP, and data messages. ### Claim 13 (depends on 11) The fixed station interface of claim 11, wherein the circuitry is configured to provide via the connection an IP transport for a High-Level Data Link Control protocol (HDLC) message without transforming the HDLC message into the VoIP-based TIA-102.BAHA and Draft TIA-102.BAHA-A Project 25 format. ### Claim 14 (depends on 11) The fixed station interface of claim 11, wherein the circuitry is configured to encrypt the HDLC message carried by the connection.