FXS S2 Module
The Yeastar S2 Module is a compact telephony expansion card that provides 2 FXS ports for connecting analog devices (such as traditional telephones or fax machines) to a VoIP PBX system. It is designed to integrate legacy analog equipment into modern IP-PBX environments easily.
Key Functions
- Adds 2 analog subscriber (FXS) interfaces via RJ11 connectors.
- Enables analog phones and fax machines to work with IP-based PBX systems.
- Ideal for hybrid deployments where both IP and analog devices coexist.
Compatibility
- Works with Yeastar S-Series and P-Series VoIP PBX systems (e.g., S20, S50, S100, S300, S412, P550, P560, P570).
Electrical & Telephony Specs
- Ports: 2 × RJ11 FXS
- On-hook Voltage: 48 V
- Off-hook Voltage: 11 V
- Off-hook Current: 10 mA
- Ring Voltage: 85 V @ 25 Hz
- Loop Impedance: ~2000 Ω
- Loop Current: ~20 mA
- Ring Load: 840 Ω
- Max Supported Line Length: ~1500 m
- Terminating Impedance Option: 600 Ω
- Pulse Dial Speed: 100–135 ms / 10pps
- Surge Protection: 1.5 kV (10/70 μs)
- REN Load @ 1000 m: 1 REN ≈ 7000 Ω, 3 REN ≈ 2330 Ω, 5 REN ≈ 1400 Ω
Typical Use Case
- Expanding an IP PBX with analog phone/fax support without needing external gateways.
- Useful in offices that still rely on a few analog handsets while migrating to VoIP.
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