Overview
The EPON OLT SFP PX20 Transceiver is the legacy optical module designed for the original Gigabit Ethernet Passive Optical Network (GEPON) standard. Compliant with IEEE 802.3ah 1000BASE-PX20, this SFP provides the fundamental optical interface for OLTs connecting to standard Optical Distribution Networks (ODN).
Operating with a symmetric data rate of 1.25 Gbps, this module features a 1490nm continuous-mode transmitter and a 1310nm burst-mode receiver. With a standard optical power budget of approximately 24-26dB, it is optimized for shorter reach deployments (typically 10km at full split) or standard 20km links with lower split ratios (e.g., 1:16), making it a cost-effective choice for maintenance and legacy system support.
Key Features
- Legacy PX20 Standard: The original GEPON optic specification, ideal for replacing older modules or specific low-power network designs.
- Symmetric 1.25G Bandwidth: Provides equal upstream and downstream speeds for consistent network performance.
- IEEE 802.3ah Compliant: Fully meets the 1000BASE-PX20 specification for guaranteed interoperability with older ONUs.
- Burst-Mode Receiver: Capable of receiving time-division multiplexed signals from multiple ONUs.
- Digital Diagnostics (DDM): Supports standard monitoring of optical parameters (Tx/Rx power, temperature, voltage).
- Hot-Pluggable Design: Standard SFP form factor with SC/UPC interface for quick field replacement.
Applications
- Legacy Network Maintenance: Direct replacement for failed optics in older GEPON deployments without requiring network re-design.
- Short-Reach FTTH: Suitable for dense urban deployments where fiber runs to the subscriber are short (<10km).
- Campus Networking: Ideal for connecting buildings within a business park or university campus using passive splitters.
- Lab & Testing Environments: Cost-effective solution for testing OLT/ONU configurations where high power budgets are unnecessary.
Specifications
| Parameter | Value |
|---|---|
| Form Factor | SFP |
| Standard | EPON PX20 (Base Class) |
| Data Rate | 1.25 Gbps Symmetric |
| Wavelength (Tx) | 1490nm (DFB) |
| Wavelength (Rx) | 1310nm (APD) |
| Tx Power | +2 to +7 dBm |
| Rx Sensitivity | < -24 dBm |
| Optical Budget | ~24-26 dB |
| Max Split Ratio | 1:32 (Short distance) / 1:16 (20km) |
| Max Distance | 20km |
| Connector | SC/UPC |
| Operating Temp | 0°C to 70°C |
PX20 vs. PX20+ vs. PX20++
Understanding the power budget is crucial for selecting the right module:
- PX20 (This Module): ~24-26dB Budget. Good for shorter links or lower split ratios (1:16).
- PX20+: ~28dB Budget. The modern standard, supporting 1:32 at 20km.
- PX20++: ~32dB Budget. Enhanced power for 1:64 splits or long-distance links.
FAQ
1. What is the difference between PX20 and PX20+?
The main difference is the optical power budget. PX20 is the older standard with lower Rx sensitivity and Tx power, offering about 24-26dB of budget. PX20+ improves this to ~28dB, allowing for longer distances (20km) at full 1:32 split ratios. PX20 modules are best used for repairs or shorter links.
2. Can I use a PX20 module to replace a PX20+ module?
Generally, no. If your network was designed for PX20+ (20km reach, 1:32 split), installing a PX20 module may result in insufficient optical power reaching the ONUs, causing link drops. You should only use PX20 if your specific link budget allows for it.
3. Is this module compatible with mainstream OLT brands?
Yes, provided the OLT accepts generic MSA-compliant SFPs. For locked systems like Cisco, Huawei, or ZTE, please specify your hardware model so we can code the transceiver EEPROM correctly before shipping.
4. Does this support Digital Diagnostics Monitoring (DDM)?
Yes, DDM is supported, allowing you to check the health of the fiber link by monitoring real-time data such as optical output power and receiver input power.
5. What connector does this use?
It uses a standard Simplex SC/UPC connector (Blue). Do not use APC (Green) connectors.
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