Overview
The EPON OLT SFP PX20+ Transceiver is the industry-standard optical module for deploying Gigabit Ethernet Passive Optical Networks (GEPON). Designed to meet the IEEE 802.3ah 1000BASE-PX20+ specification, this module serves as the primary interface between the OLT (Optical Line Terminal) and the passive optical distribution network.
Operating with a symmetric data rate of 1.25 Gbps, it utilizes a 1490nm continuous-mode transmitter and a 1310nm burst-mode receiver. With an optical power budget of approximately 28dB, the PX20+ module is engineered to support standard 1:32 split ratios over distances up to 20km, making it the most versatile and widely used optic for residential and commercial FTTH deployments.
Key Features
- Standard PX20+ Class: Provides a stable optical budget (~28dB) suitable for mainstream network architectures.
- Symmetric 1.25G Speed: Delivers balanced upstream and downstream bandwidth for high-speed internet access.
- IEEE 802.3ah Compliant: Fully compatible with 1000BASE-PX20+ standards, ensuring interoperability with compliant ONUs.
- Burst-Mode Reception: Advanced APD receiver detects incoming burst signals from multiple subscribers without packet loss.
- Digital Diagnostics (DDM): Real-time monitoring of Tx power, Rx levels, voltage, and temperature via the I2C interface.
- Hot-Pluggable SFP: Standard SFP footprint with an SC/UPC receptacle for easy installation and maintenance.
Applications
- Standard FTTH Access: Perfect for residential deployments utilizing a standard 1:32 splitter configuration.
- ISP Network Expansion: Cost-effective solution for expanding subscriber capacity in urban and suburban areas.
- Video Surveillance: Reliable backhaul for IP camera networks utilizing PON structures.
- Enterprise LAN: Connects multiple campus buildings or office units via passive fiber splitters.
Specifications
| Parameter | Value |
|---|---|
| Form Factor | SFP |
| Standard | EPON PX20+ |
| Data Rate | 1.25 Gbps Symmetric |
| Wavelength (Tx) | 1490nm (DFB) |
| Wavelength (Rx) | 1310nm (APD) |
| Tx Power | +2.5 to +7 dBm |
| Rx Sensitivity | < -27 dBm |
| Optical Budget | ~28 dB |
| Max Split Ratio | 1:32 (Typical) |
| Max Distance | 20km |
| Connector | SC/UPC |
| Operating Temp | 0°C to 70°C |
Comparison: PX20+ vs. PX20++
Choosing the right module depends on your network’s loss calculation:
- PX20+ (This Module): The standard choice. Offers ~28dB budget. Best for 1:32 split ratios.
- PX20++ (Enhanced): Offers ~32dB budget. Required for 1:64 split ratios or longer distances where signal loss is higher.
FAQ
1. What is the typical split ratio for a PX20+ module?
The PX20+ standard is designed to support a 1:32 split ratio at a maximum distance of 20km. While 1:64 is technically possible if the fiber distance is very short (e.g., <5km), we recommend upgrading to PX20++ for reliable 1:64 deployments.
2. Can I replace a PX20 module with this PX20+ module?
Yes. The PX20+ is a direct upgrade to the older legacy PX20 standard. It provides slightly better power output and sensitivity, ensuring a more robust link margin for existing networks.
3. Will this work with third-party OLTs like Ubiquiti or VSOL?
Generally, yes. Most “white box” OLTs accept generic MSA-compliant transceivers. However, major brands like Huawei or ZTE often require specific vendor coding in the EEPROM. Please specify your OLT brand upon ordering.
4. Does the module support DDM/DOM?
Yes, Digital Diagnostic Monitoring is built-in. This allows network administrators to view critical data such as optical output power and receiver input power directly from the OLT CLI or management interface.
5. What fiber cable should be used?
This transceiver requires Single Mode Fiber (SMF) usually G.652 or G.657, terminated with a Blue SC/UPC connector. Do not use Green APC connectors as they will damage the port.
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