M-Core Cables : Revolutionizing Connectivity
2024-04-27
Blog
Loose Tube vs Tight Buffered Fiber Cable: Which to Use?
Loose tube vs tight buffered optical fiber cable: how each is built, indoor vs outdoor use, termination, and how to choose for your project.
Optical fiber cables protect the fibers inside in two main ways: loose tube and tight buffered. The choice affects where the cable can be installed, how it handles the environment and how easily it can be terminated.
Loose tube cable
In a loose tube cable, the fibers sit freely inside a tube, usually filled with water-blocking thixotropic jelly. The fibers are isolated from stress caused by temperature changes, stretching and cable movement, and the jelly keeps moisture out. This makes loose tube the standard design for outdoor routes: duct, aerial, direct burial and long-distance networks.
Tight buffered cable
In a tight buffered cable, each fiber has its own protective coating applied directly over it, typically bringing it to about 900 microns. There is no gel, so the fibers are easy to handle and terminate directly with connectors. Tight buffered cables are mainly used indoors: building risers, patch cords and connections inside data centres and offices.
Side-by-side comparison
| Feature | Loose tube | Tight buffered |
|---|---|---|
| Main use | Outdoor and long routes | Indoor and short links |
| Moisture protection | Excellent with gel filling | Limited |
| Temperature and stress | Fibers isolated from stress | More sensitive |
| Termination | Usually spliced to pigtails | Direct connectorisation is easy |
| Handling | Gel must be cleaned when opening | Clean and quick to work with |
How to choose
- Outdoor, duct, aerial or underground: choose loose tube
- Inside buildings and short indoor links: tight buffered is easier
- Routes that go from outdoor to indoor: use loose tube outside and transition to indoor cable at a splice point, following local fire safety rules
Frequently asked questions
Why is gel used in loose tube cable?
The thixotropic gel blocks water and cushions the fibers, protecting them from moisture and mechanical stress over the cable's life.
Can loose tube cable be used indoors?
Some designs are rated for indoor and outdoor use, but standard outdoor loose tube cables are usually transitioned to indoor-rated cable inside buildings to meet fire safety requirements.
Which design is used for FTTH?
Loose tube cables are widely used for FTTH feeder and distribution routes, with drop cables or indoor cables used for the final connection.
M-Core manufactures single loose tube optical fiber cables with jelly filling, glass yarn strength members and HDPE sheaths.
Recent Blogs
Frequently Asked Questions
What products does M Core manufacture?
M Core manufactures Optical Fiber Cables (OFC), CCTV cables, networking cables, and FRP rods for domestic and international markets.
Does M Core export cables internationally?
Yes, M Core exports its wire and cable products to more than 27 countries worldwide, serving distributors and businesses globally.
Where is the M Core manufacturing facility located?
M Core's manufacturing facility is located in Kundli, Sonipat, Haryana, India.
How can I request a product catalog or quote?
You can download our product catalogs directly from the e-catalogs page, or contact us through the contact page for a customised quote.
.png){kind=logo}