Overview
The XG-PON OLT XFP N2a Transceiver is a high-performance optical module designed for service providers deploying 10-Gigabit Passive Optical Networks (XG-PON) using equipment requiring the XFP form factor. While many modern systems utilize SFP+, the XFP interface remains a critical standard for numerous high-density OLT line cards in operation today.
This module complies strictly with the ITU-T G.987.2 standard, delivering asymmetric bandwidth of 9.953 Gbps downstream and 2.488 Gbps upstream. A key feature of this model is its N2a Optical Class rating. Unlike standard N1 modules, the N2a class offers a higher optical power budget (typically 31dB). This additional power is essential for network designs requiring higher split ratios (up to 1:128) or extended reach beyond the standard 20km, allowing ISPs to maximize subscriber density per OLT port.
Key Features
- XFP Form Factor: Designed for OLT chassis and line cards with XFP cages, ensuring compatibility with specific carrier-grade platforms.
- High-Power N2a Class: Superior optical budget (~31dB) supports 1:128 split ratios, reducing the cost per subscriber.
- Asymmetric 10G Throughput: Delivers 10G downstream for high-bandwidth applications and 2.5G upstream.
- Precision Optics: Features a cooled 1577nm EML transmitter and a 1270nm APD burst-mode receiver.
- Digital Diagnostics (DDM): Integrated monitoring functions for Tx power, Rx power, temperature, and voltage via the I2C interface.
- Hot-Swappable: Allows for seamless upgrades and maintenance without powering down the OLT chassis.
Applications
The XG-PON XFP N2a module is engineered for demanding FTTx environments:
- High-Density Urban Networks: utilizing 1:128 splitters to connect more homes to a single fiber strand.
- Legacy Network Upgrades: Enabling 10G services on existing OLT hardware that relies on XFP ports.
- Long-Reach Rural Broadband: Overcoming signal loss in extended fiber runs where standard N1 modules would fail.
- Triple-Play Services: Supporting simultaneous high-speed internet, IPTV, and VoIP with carrier-grade reliability.
Specifications
| Parameter | Value |
|---|---|
| Form Factor | XFP (OLT Application) |
| Standard Compliance | ITU-T G.987.2 (XG-PON1) |
| Throughput | 9.953 Gbps Down / 2.488 Gbps Up |
| Optical Class | N2a (High Power Budget) |
| Tx Wavelength | 1577nm (EML) |
| Rx Wavelength | 1270nm (APD Burst Mode) |
| Connector Type | Simplex SC/UPC |
| Max Split Ratio | Up to 1:128 |
| Operating Temperature | 0°C to 70°C (Commercial) |
| Max Distance | 20km (Standard) / Extended depending on split |
Advantages
The XG-PON OLT XFP N2a offers a strategic advantage for operators looking to squeeze maximum value out of their passive optical distribution network (ODN). By utilizing the N2a class optics, operators can bypass the need for expensive optical amplifiers or reachable extenders in many scenarios.
Furthermore, the specific XFP form factor serves a vital niche. As manufacturers transition to SFP+, sourcing high-quality XFP modules for existing deployed chassis can be challenging. This module ensures that operators can continue to leverage their significant investment in XFP-based OLT infrastructure while offering competitive 10G speeds to end-users.
FAQ (Technical & Product Questions)
1. Can I use this XFP module in an SFP+ port?
No. XFP and SFP+ are different form factors with different physical dimensions and electrical pinouts. They are not interchangeable. You must ensure your OLT line card specifically accepts XFP modules.
2. What does “N2a Class” mean?
N2a refers to the optical link budget defined by ITU-T standards. An N2a module transmits at a higher power and has better receiver sensitivity than an N1 module, resulting in a budget of approximately 31dB. This allows for more splitters (e.g., 1:128) or longer cable runs.
3. Does this module work with GPON ONUs?
No. This module transmits at 1577nm (XG-PON standard). Legacy GPON ONUs listen at 1490nm. To connect a customer, they must have an XG-PON ONU. However, XG-PON and GPON can coexist on the same fiber if a WDM combiner is used upstream.
4. Is this module compatible with XGS-PON?
No. XGS-PON is a symmetrical 10G/10G standard (G.9807.1). This module is XG-PON1 (Asymmetric 10G/2.5G). While the downstream wavelength (1577nm) is the same, the upstream protocols and speeds differ.
5. What connector should I use?
This module requires a standard simplex SC/UPC single-mode fiber connector. It is not compatible with LC connectors or MPO/MTP® multifiber connectors.
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