Description
The S2 is a module with 2 FXS ports to terminate two analog telephone.
S2 Module 2FXS Compatible with MyPBX series and Asterisk card.
Yeastar S2 Module (2 FXS) – Specifications
General / Compatibility
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Module type: 2‑port FXS (Foreign Exchange Subscriber / Station)
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Connectors: 2 × RJ11 FXS ports
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Compatible with Yeastar S‑Series (S20, S50, S100, S300, S412) and P‑Series (P550, P560, P570), plus legacy MyPBX / MyPBX‑type systems if module slots permit
Electrical / Line Characteristics
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On‑hook (idle) voltage (tip/ring): 48 V
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Ring voltage: 85 V
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Ring frequency: 25 Hz
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Off‑hook voltage: 11 V
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Off‑hook current (loop current when phone picked up): approx. 10 mA
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Loop impedance (line load impedance): 2000 Ω
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Terminating (line) impedance option: 600 Ω
Line / Cabling Support
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Maximum cable length (from PBX module to analog device): up to 1500 meters
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Ring load: 840 Ω
Functionality & Use Cases
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Allows connection of up to 2 analog devices (phones, fax machines, analog POS, etc.) to a VoIP PBX system
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Enables hybrid PBX deployments: analog + VoIP devices, suitable for gradual conversion or keeping legacy devices
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Simple installation: module plugs into compatible PBX slot, powered by main PBX (no external power source required)
