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MikroTik HS-31DLC20D - SFP Module 1G/2.5G Singlemode 20km
The MikroTik HS-31DLC20D is a 1G and 2.5 Gbps SFP module designed for single-mode fiber optics, operating at a wavelength of 1310 nm with a Duplex LC connector, offering a range of up to 20 km.
MikroTik HS-31DLC20D – 1G/2.5G SFP Module (Single-mode, 1310nm)
The MikroTik HS-31DLC20D is a reliable SFP module designed for long-distance fiber optic connections. It was designed for single-mode fiber optics, enabling stable data transmission over distances up to 20 kilometers. The module is an improved successor to the S-31DLC20D model, offering a significant leap in performance – supporting speeds of 2.5 Gbps (while maintaining downward compatibility with 1 Gbps).
The module uses the widely used 1310 nm wavelength for full-duplex transmission via a standard Duplex LC connector. It is an excellent choice for backbone networks, large campus installations, and Internet Service Provider (ISP) infrastructures where reliability over long distances is essential. An additional advantage is the built-in digital diagnostics function (DDM), which constantly monitors module parameters (including optical power, temperature, voltage, and laser current), enabling proactive network management and failure prevention.
Key features:
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Bandwidth: Supports data transmission speeds of 1 Gbps and 2.5 Gbps.
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Range up to 20 km: Ideal for long-distance connections in wide-area networks.
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Fiber Type: Suitable for single-mode operation.
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Wavelength: Commonly used wavelength: 1310 nm.
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Interface: Standard Duplex LC optical connector.
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DDM Diagnostics: Built-in real-time monitoring of key optical and environmental parameters.
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Optical Parameters: Transmitter output power from -5 to 0 dBm; Receiver sensitivity up to -20 dBm.
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Economical upgrade: Higher 2.5G throughput at the price of older 1G modules, allowing for cost-effective performance upgrades to existing optical infrastructure.
Technical specifications
Optical transmission parameters |
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| Wavelength | 1310 nm |
| Transmission speed (Data Rate) | 1G 2.5G |
| Transmitter output power (Transmitter output power) | From -5 to 0 dBm (introduced into SMF 9/125μm) |
| Receiver sensitivity (Receiver sensitivity OMA) | Max. -20 dBm (measured with PRBS 27-1 @2.5Gbps test pattern, worst-case extinction ratio, BER ≤1×10⁻¹⁰) |
| Loss of Signal (LOS) Indication | LOS-Deasserted (Average): Max. -21 dBm LOS-Asserted (Average): Min. -35 dBm LOS Hysteresis: 0.5 to 5 dB |
Electrical Characteristics |
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| Output Voltage Receiver | 300 – 600 mVpp (differential, with 100Ω termination) |
| LOS Output Voltage Levels | LOS Output Voltage-High: From Vcc - 0.5V to Vcc LOS Output Voltage-Low: From Vee to Vee + 0.5V |
| LOS Output Specifications | Open collector output. Requires pull-up with a 4.7kΩ – 10kΩ resistor on the motherboard. Logical 0 indicates normal operation; Logical 1 indicates signal loss. |
Other |
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| Module Format | SFP |
| Connector Type | Duplex LC |
| Fiber Type (Mode) | Single Mode |
| Maximum Distance | Up to 20 km |
| Manufacturer SKU | HS-31DLC20D |
|---|---|
| Manufacturer | Mikrotik |
| GPSR contact | Mikrotikls SIA Unijas iela 2, LV-1039 Riga, Latvia support@mikrotik.com |
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