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What does PX20 mean for optical modules

Fibre interconnection and data room reference Published 22 Jul 2025

Use this reference to prepare product questions for FD SOLUCIONES. Check interfaces, capacity, protection and installation requirements against the current product documentation.

The PX20 is a 1. 25 Gbps bidirectional SFP optical transceiver designed for EPON OLT networks, supporting up to 20 km single-mode fiber links with TX1490nm/RX1310nm wavelengths.

Overview

The PX20 optical module is a small form-factor pluggable (SFP) transceiver used in EPON (Ethernet Passive Optical Network) OLTs to enable high-speed fiber optic communication. It supports 1. 25 Gbps bidirectional data transmission over a single fiber, using different wavelengths for upstream (1310 nm) and downstream (1490 nm) signals to prevent interference, a method known as single-fiber bidirectional (BiDi) transmission.

Key Specifications

Data Rate: 1. 25 GbpsWavelengths: TX 1490 nm / RX 1310 nmMaximum Reach: 20 km over single-mode fiberConnector Type: SC/UPCOperating Temperature: Typically -40°C to +85°C, suitable for outdoor deployment Power Control: Internal automatic power control (APC) ensures stable optical output across voltage and temperature variations Fault Management: TX_Fault and TX_Disable pins allow monitoring and control of laser operation CompatibilityThe PX20 module is compatible with standard EPON OLT systems that support 1. 25 Gbps BiDi SFPs, including platforms from Huawei, ZTE, Nokia, and Fiberhome, without requiring chassis replacement if the OLT supports mini-GBIC form factors.

Variants like PX20++ and PX20+++ differ mainly in optical power output (e.g., 7 dB vs 8 dB) and are chosen based on network reach, split ratios, and fiber link conditions. Deployment ConsiderationsPlug-and-Play: The module is hot-pluggable and typically does not require special software or training for installation. Outdoor Use: Designed to withstand harsh climates and extreme temperature swings, making it suitable for long-term outdoor deployment.

Network Performance: High receive sensitivity ensures stable connections over the advertised 20 km distance, even in complex FTTH or FTTN setups. Practical ApplicationsPX20 modules are widely used in FTTH (Fiber to the Home) and FTTN (Fiber to the Node) networks to upgrade existing OLTs, increase uplink capacity, and maintain stable optical links without replacing the entire OLT chassis. They are particularly useful in rural broadband deployments where long fiber runs and high split ratios are common.

In summary, the PX20 is a robust, high-performance SFP module for EPON OLT networks, offering reliable 1. 25 Gbps bidirectional communication over single-mode fiber, with multiple variants to suit different network requirements and environmental conditions.

What does PX20 mean for optical modules - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

What does PX20 mean for optical modules
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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