Yeastar O2 Module – 2FXO (YST-O2)

The Yeastar O2 Module (YST-O2) is a compact FXO expansion module designed to add two analog PSTN lines to compatible Yeastar PBX systems. It enables seamless integration of traditional analog telephone lines into modern VoIP environments, allowing businesses to preserve existing telephony infrastructure while benefiting from advanced IP-based communication features. Ideal for organizations seeking reliability, flexibility, and cost efficiency, the YST-O2 ensures smooth connectivity between legacy and VoIP systems.

Product Features

Two FXO Ports for PSTN Connectivity

The Yeastar O2 Module is equipped with two RJ11 FXO ports, allowing direct termination of analog PSTN or POTS lines. This enables inbound and outbound calls over traditional phone lines within a VoIP PBX environment.

Seamless Integration with Yeastar PBX Systems

Designed specifically for Yeastar platforms, the YST-O2 integrates smoothly with S-Series, P-Series, and legacy MyPBX systems. Its plug-and-play Mini-PCIe form factor simplifies installation and reduces deployment time.

Enhanced Audio Quality

Built-in echo cancellation and support for G.711 codecs ensure clear and stable voice communication. Advanced audio processing minimizes latency and echo, delivering professional call quality.

Caller ID and Polarity Reversal Support

The module supports caller ID detection and transmission, as well as polarity reversal detection. These features improve call handling accuracy and compatibility with PSTN services.

Reliable Backup and Failover Capability

The Yeastar O2 Module can be configured as a PSTN backup line, providing failover protection during internet or SIP trunk outages. This ensures uninterrupted communication and business continuity.

Easy Identification and Maintenance

Featuring Yeastar’s standard red color coding for FXO modules, the YST-O2 is easy to identify during installation or maintenance. Its hot-swappable design allows replacement without system downtime.

Product Specifications

• 2 x RJ11 FXO ports
• Mini-PCIe interface with plug-and-play installation
• PSTN (Public Switched Telephone Network) line termination
• Ring frequency detection: 15 to 50 Hz
• Ring voltage detection: 30+ VRMS (mode dependent)
• Signaling modes: FXO, Foreign Exchange Station Defined Network, PLAR
• Built-in echo cancellation with G.711 codec support
• Caller ID and polarity reversal detection
• Powered directly by the host PBX system
• Compact, hot-swappable design
• Approximate weight: 0.2 kg
• Operating temperature range: -10°C to 60°C
• Operating humidity: 5% to 95% non-condensing
• Compliance certifications: CE, FCC, UL