{"schemaVersion":1,"slug":"protection-fiber-transmit-interface","name":"Protection fiber transmit interface","kind":"symbol","abbreviation":"PFTI","aliases":["Line carrier and protection communication interfaces","switchyards Line carrier and protection communication interfaces","switchyards","Switchyards","Local protection data","Optical transmit path"],"category":"power-distribution","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the assigned optical output carrying protection communication to its remote endpoint.","description":["Identifies the assigned optical output carrying protection communication to its remote endpoint. A protection communication interface carries information between circuit ends or couples a communication signal to a primary line. Its signal path is different from the power-current path even when both use part of the same installation.","In a switchyard line bay, carrier-coupling equipment can connect a protection communication terminal to the transmission conductor. Fiber-based protection uses another physical path but still needs named endpoints and channel supervision. For this reference, the drawing identifies “Local protection data” at the input and “Optical transmit path” at the output. Physical link availability does not prove application data validity.","Show each coupling boundary and the intended information direction. Frequency selection, channel performance, insulation duty and protective coordination require the selected communication and primary equipment design. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Local protection data. Identify its source device or document and the state represented on the drawing.","Follow the named output: Optical transmit path. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Physical link availability does not prove application data validity.","Show each coupling boundary and the intended information direction. Frequency selection, channel performance, insulation duty and protective coordination require the selected communication and primary equipment design."],"drawingChecklist":["Label the source and connection reference for local protection data.","Identify the destination and defined state of optical transmit path.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Physical link availability does not prove application data validity."],"distinction":"Physical link availability does not prove application data validity. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Switchyards"},{"label":"Input / boundary","value":"Local protection data"},{"label":"Output / connection","value":"Optical transmit path"},{"label":"Lookup label","value":"PFTI is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-carrier","relevance":"Public technical context for line carrier and protection communication interfaces. Line traps, coupling and power-line carrier communications. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["capacitor-voltage-transformer","85-pilot-or-carrier-receiver-relay","protection-fiber-receive-interface"],"artwork":"pi26-protection-fiber-transmit-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchyards","family":"line-communications","input":"Local protection data","output":"Optical transmit path"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the assigned optical output carrying protection communication to its remote endpoint.","example":"In a switchyard line bay, carrier-coupling equipment can connect a protection communication terminal to the transmission conductor. Fiber-based protection uses another physical path but still needs named endpoints and channel supervision. For this reference, the drawing identifies “Local protection data” at the input and “Optical transmit path” at the output. Physical link availability does not prove application data validity.","drawings":"Start at the named input: Local protection data. Identify its source device or document and the state represented on the drawing. Follow the named output: Optical transmit path. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Local protection data"},{"name":"Output","meaning":"Optical transmit path"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Local protection data","PFTI","Optical transmit path"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Line traps: power-line carrier communication","url":"https://www.gevernova.com/grid-solutions/sites/default/files/2025-09/Line-Traps-Brochure-EN-N50059-Hybrid-202504-R002.pdf"}],"profileId":"power-installation-line-communications"},"url":"https://eloragrid.ai/symbols/protection-fiber-transmit-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/protection-fiber-transmit-interface.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-carrier","publisher":"GE Vernova","title":"Line traps: power-line carrier communication","url":"https://www.gevernova.com/grid-solutions/sites/default/files/2025-09/Line-Traps-Brochure-EN-N50059-Hybrid-202504-R002.pdf","scope":"Line traps, coupling and power-line carrier communications.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for line carrier and protection communication interfaces. Line traps, coupling and power-line carrier communications. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}