What is a Fiber Access Terminal (FAT)?
Fiber Access Terminal(FAT) is a vital component of today's FTTx deployments. The FAT device not only integrates fiber splicing and patching functions, but also optimizes the organization and management fiber networks. This increases deployment efficiency and reliability.
Basic Functions of Fiber Access Terminals
The fat box, as a transition point between feeder cables and drop cables, is mainly used for the protection, storage, and management of the fiber optics in the optical fiber communication system.
The core functions include:
Fiber Splicing: Fixed operation space for feeder and branch connecting fibers.
Fibre Distribution: Distributing optical signals to multiple subscribers using a built-in PLC splitter.
Patch Cord Management: By adopting adapter modules for convenient jumpers and maintenance.
Line Protection: Protects fibers from getting damp, dust, and crushed, prolonging the service life of the network.
Environmental Suitability: developed in different IP-protection levels for accommodating different installation environments.
Why is FAT the Center of FTTH Networks?
The FAT box isn't just the bridge - it is the hub of networks from here to your home.
Reasons for their very existence are as follows:
Feeders are connected to drop cables to bring fiber to an accessible end for the end user.
Support built-in splitting, one-to-many series connection, and lower overall cost on installation and deployment.
Improved network flexibility and expandability for new subscribers in the future, without the need for a substantial upgrade of the network infrastructure.
Increased immunity to environmental hazards due to the sealed nature of the physical fiber path.
Streamlined maintenance and upgrades, resulting in fast fault identification and service restoration.
Therefore, FAT boxes are considered the key distribution nodes that influence the network quality, operation capability, and user experience.
Indoor vs Outdoor FAT (Fiber Access Terminals)
According to the applied environment, the FAT box is divided into an inside and outside FAT box.
Indoor Fiber Access Terminals
They are manufactured using an ABS+PVC material of high resistance, and their small dimensions guarantee a very light and manageable product, normally white. They can be installed on walls, in telecommunication closets, or in distribution boxes.
Features:·
Compact and easy to install
For fiber connections, low capacity is appropriate
Lower IP protection (Such as IP40-IP55), for dry conditions
Easier to maintain and extend at home or the office
Typical Applications:
FTTH fiber wiring in homes
If you want a fiber connection for a small office
Campus network access
Outdoor Fiber Access Terminals
Outdoor FATs 0also referred to as Gel Sealed Fiber Access Terminals) are constructed of UV-resistant PC+ABS and are usually black or dark grey. With ultrahigh IP ratings of IP65, IP66, or IP68, they are designed to withstand adverse weather conditions.
Features:
Greater resistance to water, dust, and UV rays
In the internal larger space, it can accommodate larger fiber splicing capacity and pigtails storage.
The polycarbonate cased Diamond Series is available in a wall-mount or pole-mount enclosure with or without an optional sunshield (007 option).
Support various kinds of fiber connections such as bare fiber, pigtails, and patch cords
Integrated with PLC splitters (1x4, 1x8, 1x16, etc.)
Typical Applications:
Outdoor FTTH deployments
Community broadband networks
Smart city fiber cabling
Backbone networks for the video-surveillance platform
How to Identify a High-Quality FAT Device?
Choosing a high-quality FAT device is crucial for the success and longevity of FTTH projects. Key aspects to consider when selecting a FAT include:
IP Protection Rating
Outdoor applications require at least IP65 protection, preferably IP68, for complete waterproofing and dust resistance.
Material Quality
Shells should be made of industrial-grade, UV-resistant PC+ABS materials to resist aging and cracking.
Internal Structure Design
Adequate space should be reserved for splicing trays, patching, and splitter installation with organized cable routing.
Adapter and Splitter Compatibility
Ensure compatibility with SC, LC connectors, and various splitter types such as 1x4, 1x8, 1x16, etc.
Maximum Splicing Capacity
Select FAT models that meet your project's splicing needs - common options are 12, 24, or 48 fiber cores.
Ease of Installation
Should support wall-mount, pole-mount, and come with necessary mounting kits.
Certifications and Standards
Prefer products compliant with international standards such as IEC, RoHS, and IP68 certifications.
Scalability
A good FAT should support modular upgrades for future network expansion.
After-Sales Support
Reliable suppliers offer technical training, replacement parts, and service guarantees.
Choosing the Right FAT Device for Successful FTTH Deployments
SPRING Optic's full line of fiber terminals, from compact indoor models to high-capacity outdoor models, will help you achieve fast and stable FTTH deployments.
