Yeastar S2 Module (2 FXS)

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

• Module type: 2‑port FXS (Foreign Exchange Subscriber / Station)

• Connectors: 2 × RJ11 FXS ports

• 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

• On‑hook (idle) voltage (tip/ring): 48 V

• Ring voltage: 85 V

• Ring frequency: 25 Hz

• Off‑hook voltage: 11 V

• Off‑hook current (loop current when phone picked up): approx. 10 mA

• Loop impedance (line load impedance): 2000 Ω

• Terminating (line) impedance option: 600 Ω

Line / Cabling Support

• Maximum cable length (from PBX module to analog device): up to 1500 meters

• Ring load: 840 Ω

Functionality & Use Cases

• Allows connection of up to 2 analog devices (phones, fax machines, analog POS, etc.) to a VoIP PBX system

• Enables hybrid PBX deployments: analog + VoIP devices, suitable for gradual conversion or keeping legacy devices

• Simple installation: module plugs into compatible PBX slot, powered by main PBX (no external power source required)