{"product_id":"rdl-st-tc1","title":"RDL ST-TC1 – Telephone System Coupler, CO Line Simulator","description":"\u003ch2\u003eWhat is the RDL ST-TC1?\u003c\/h2\u003e\n\u003cp\u003eThe RDL ST-TC1 is a telephone system coupler that simulates a CO line so an on-site telephone switching unit (KSU) can control paging or radio systems. It connects to the KSU as if it were an incoming phone line.\u003c\/p\u003e\n\u003ch2\u003eHow does it work?\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/rdlnet.com\/wp-content\/uploads\/2024\/01\/st-tc1.jpg\" alt=\"RDL ST-TC1 Telephone System Coupler, CO Line Simulator\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp\u003eWhen the KSU seizes the line to the ST-TC1, a relay contact closure is held for as long as the line is seized, which can switch a paging system or radio system. A 600 Ω transformer-isolated audio feed carries audio into or out of the telephone switching unit, and DTMF tones pass through. The ST-TC1 is not intended for connection directly to a telephone CO line or to any line with ringer voltage present. RDL notes it can be paired with the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-st-vox1\"\u003eRDL ST-VOX1\u003c\/a\u003e to provide push-to-talk for two-way communications.\u003c\/p\u003e\n\u003ch2\u003eWhat are the key features?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCO line simulation\u003c\/strong\u003e — The module appears to the KSU as an incoming phone line for adding paging zones or radio interfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelay closure on line seizure\u003c\/strong\u003e — Relay contacts close when any extension seizes the line and stay closed while it is held.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransformer-isolated audio\u003c\/strong\u003e — A 600 Ω isolated audio feed passes audio to or from the telephone switching unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDTMF pass-through\u003c\/strong\u003e — DTMF tones from a telephone keypad or other generator pass through the module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-way radio interface\u003c\/strong\u003e — Pairing with an ST-VOX1 adds push-to-talk keying for two-way systems.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RDL","offers":[{"title":"Default Title","offer_id":68025797411052,"sku":"ST-TC1","price":151.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/st-tc1.jpg?v=1793583961","url":"https:\/\/creationnetworks.net\/products\/rdl-st-tc1","provider":"Creation Networks","version":"1.0","type":"link"}