SO Module FXO & FXS
The Yeastar SO Module is a plug-in telephony expansion module that combines one FXO port (for connecting an analog PSTN line) with one FXS port (for connecting an analog phone or fax). It’s designed for hybrid VoIP systems to integrate traditional analog lines and devices while providing a PSTN failover/fallback capability to keep basic calling available even if the PBX loses power or fails.
Key Features
- 1 × FXO Port (RJ11): Connects one analog PSTN (POTS) telephone line.
- 1 × FXS Port (RJ11): Connects one analog telephone or fax device.
- PSTN Fallback/Failover: Ensures analog phones can make/receive calls directly over the PSTN line if the PBX system powers down or fails.
- Echo Cancellation: Built-in support to improve voice quality.
- Termination Types: Supports standard PSTN lines and analog telephone/fax termination.
Technical Specifications (Typical)
- FXO Ring Frequency Detection: ~15 – 50 Hz
- FXS Ring Frequency: ~25 Hz
- Ring Voltage: ~85 V
- Terminating Impedance Option: ~600 Ω
- Port Types: 1 × FXO RJ11, 1 × FXS RJ11
Compatibility
Compatible with modular Yeastar S-Series and P-Series IP PBX models (such as S20, S50, S100, S300, P550, P560, P570) and older MyPBX platforms that support telephony modules.
Use Cases
- Add one analog PSTN trunk and one analog extension to an IP PBX.
- PSTN failover fallback to maintain basic voice service if the VoIP PBX is offline.
- Support for analog telephones and fax machines alongside VoIP infrastructure.
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