{"product_id":"american-fibertek-inc-rt-89tx-intercom-rack-card","title":"American FiberTek Inc. RT-89TX Intercom Rack Card","description":"\u003cdiv\u003e\u003cp\u003eThe AFI RT-89TX Rack Card Transmitter Interface from American Fibertek delivers a clean, bi-directional intercom link on a single multimode fiber for TOA systems, mounting as a rack card in AFI card cages such as SR-20\/2 or SR-20R\/1. It transmits one channel of bi-directional audio plus a contact-closure signal, supports VOX transmission, and FM-modulated audio, with diagnostic indicators for Power and Optical Presence to quickly verify system status. The unit uses multimode fiber at 850\/1300 nm and employs an ST fiber connector, aligning with TOA intercom networks (e.g., VS900 to RS150\/160\/170) for cross-system compatibility. Key specifications include an audio bandwidth of approximately 300 Hz to 10 kHz, THD around 2% at 1 kHz, and an SNR near 50 dB, reflecting low-distortion voice transmission over the fiber link. This rack-card transmitter is designed for stand-alone operation or as part of AFI’s modular intercom architecture, ensuring a transparent signal path where input microphone and audio levels can be balanced at the source for reliable, two-way communication across campus or facility intercom networks.\u003c\/p\u003e\u003c\/div\u003e","brand":"AFI","offers":[{"title":"New","offer_id":51657061073198,"sku":null,"price":173.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_e7d21a73-2600-4d8f-a194-89a8e1ef7abf.jpg?v=1769465706","url":"https:\/\/plgautomation.com\/products\/american-fibertek-inc-rt-89tx-intercom-rack-card","provider":"PLG Automation ","version":"1.0","type":"link"}