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4FXS Foreign Exchange Station Trunk Module Loop Closure Detection

Categories PBX Telephony
Brand Name: ZYCOO
Model Number: 4FXS
Certification: CE / FCC / RoHS
Place of Origin: China
MOQ: 1
Payment Terms: L/C, T/T, D/P
Supply Ability: Zycoo Co., Ltd.
Delivery Time: 5-10 business days
Dimensions: 88.5 x 132 mm
Temperature: 0°C ~ 40°C
Humidity: 5% ~ 95% Non-Condensing
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    4FXS Foreign Exchange Station Trunk Module Loop Closure Detection

    4FXS (Foreign Exchange Station) Telephony Trunk Interface Module

    FXS is an interface that connects to a station, such as an analog telephone or the FXO interface of another PBX. It provides ringing voltage and battery to the FXO devices. FXS interfaces are used on the inside of your PBX, they do not connect directly to the PSTN. One FXS channel is required for each telephone that you wish to connect to your Asterisk system.

    The Analog Station FXS board provides connectivity to standard analog phones. Typically, a phone is connected to a station interface and is, by default, in an on-hook state. When the phone goes off-hook, the phone completes the line circuit, and current flows through the line.
    The Analog Station Interface provides the following features:

    • Ring Generation and Ringing Trip
    • Loop Closure Detection
    • Loop Disconnect
    • Loop Reversal
    • Loop Voltage and Current Monitoring
    • On-hook and Off-hook Transmission
    • Hook-flash Detection
    • DTMF Signalling
    • Programmable Audio Gain
    • On-board Power Generation
    • Constant Loop Current: 20mA


    Q: Can ZYCOO's software be customized?
    A: Yes, but there is a corresponding extra charge.

    Q: Does ZYCOO support OEM/ODM?
    A: Yes, ZYCOO also offers various types of embedded hardware boards for ODM and OEM customers.

    Q: How do I purchase? Where can I get a quote?
    A: Please contact the ZYCOO sale department at for quotes or additional information.

    Q: What is the geographic availability For ZYCOO products?
    A: Zycoo is globally available. Contact us today to get more information.

    Q: For additional support or answers to questions not covered in this FAQ, who should I contact?
    A: Please contact us at


    • ZYCOO, is the leading developer and manufacturer of IP telephony devices and related systems, devoting itself over the past years to R&D powerful and scalable voice over IP (VoIP) solutions that mainly serve the SME market.

    • With the deployment of distribution channels and branch offices in Czech Republic and UAE, ZYCOO products and solutions have been deployed in more than 100 countries and trusted by over 100,000 satisfied customers. Customers can enjoy direct sales, tech-support, training, and after-sale service while using ZYCOO products and solutions.

    • Besides branded product, ZYCOO also offers various types of embedded hardware boards for ODM and OEM, as well as software modification or white-label. ZYCOO always keeps pace with the innovative VOIP technology and provides cost-effective products and services to customers.

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