Overview
The EPON OLT SFP PX20++ Transceiver is a high-performance optical module designed for Gigabit Ethernet Passive Optical Networks (GEPON/EPON). Exceeding the standard PX20+ specification, this PX20++ version offers a higher optical power budget (typically around 30-32dB), enabling service providers to reach more subscribers per PON port or extend network reach.
Compliant with IEEE 802.3ah standards, this module facilitates symmetric 1.25 Gbps data transmission. It utilizes a 1490nm continuous-mode DFB transmitter and a 1310nm burst-mode APD receiver. It is the ideal solution for “last mile” FTTx deployments requiring robust signal strength to overcome high splitter losses, such as 1:64 architectures.
Key Features
- Enhanced Power Budget: PX20++ classification provides higher Tx power (typically +3 to +7 dBm) compared to standard PX20+, supporting greater link loss.
- Symmetric Bandwidth: Delivers 1.25Gbps downstream and 1.25Gbps upstream throughput.
- Standards Compliance: Fully compliant with IEEE 802.3ah 1000BASE-PX20++ and SFP Multi-Source Agreement (MSA).
- Burst-Mode Receiver: High-sensitivity 1310nm APD receiver capable of handling rapid packet bursts from multiple ONUs.
- Digital Diagnostics: Integrated DDM/DOM allows real-time monitoring of parameters like Tx power, Rx power, and temperature.
- SC/UPC Interface: Standard simplex SC receptacle for seamless integration into the ODN.
Applications
- High-Density FTTH: Supports 1:64 split ratios, doubling the subscriber capacity per PON port compared to standard PX20 deployments.
- Long-Reach Access: Ideal for rural or extended network segments where fiber runs approach the 20km limit with significant attenuation.
- Network Upgrades: A drop-in replacement for weaker PX20+ modules to resolve low-light issues at customer premises without re-cabling.
- Triple Play Services: Provides the bandwidth and stability required for data, voice (VoIP), and video (IPTV) services over a single fiber.
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 | +3 to +7 dBm (Typical) |
| Rx Sensitivity | < -30 dBm |
| Optical Budget | ~32 dB |
| Max Distance | 20km |
| Connector | SC/UPC |
| Operating Temp | 0°C to 70°C |
PX20+ vs. PX20++
The primary difference lies in the optical power budget, which dictates the network design:
- PX20+ (Standard): Typically offers ~28dB budget. Suitable for 1:32 split ratios.
- PX20++ (Enhanced): Offers ~32dB budget. Designed to support 1:64 split ratios or links with higher insertion loss (e.g., extra patch panels or older fiber).
FAQ
1. Can I use this PX20++ module in a PX20+ network?
Yes. The PX20++ module is backward compatible. However, you must ensure that the optical power arriving at the ONU (optical network unit) does not exceed its overload threshold. If the fiber run is very short (e.g., lab testing), you may need an attenuator.
2. What is the maximum split ratio for this module?
With its enhanced power budget, the PX20++ transceiver typically supports a 1:64 split ratio within a 20km radius, provided the total link loss (including connectors and splices) stays within the ~32dB budget.
3. Is this module compatible with Huawei or ZTE OLTs?
EPON OLTs from major vendors often have firmware locks. While this module follows the MSA standard, you must confirm compatibility or request specific coding (e.g., for Huawei MA5680T or ZTE C300) when ordering to ensure the OLT recognizes the transceiver.
4. Does this module support OTDR functionality?
Standard PX20++ modules do not have built-in OTDR (Optical Time Domain Reflectometer) functionality. They rely on standard DDM (Digital Diagnostics Monitoring) to report light levels.
5. What connector type is required?
This module requires a Simplex SC/UPC (Blue) fiber connector. Using an APC (Green) connector will cause significant signal loss and reflection issues.
Reviews
There are no reviews yet.