MTP Cassette and TAP Cassette Over Standard LGX Cassette

Pre-terminated fiber cabling has become a favorable choice for today’s high speed networks in data centers as this technology enables high bandwidth, high port density, easy cable management, future data rates migration and security monitoring. And modular system allows for rapid deployment of high density data center infrastructure as well as improved troubleshooting and reconfiguration during moves, adds and changes. MTP cassette is such a modular module. Usually, it employs configuration of 12 fibers or 24 fibers, containing MTP adapter, LC/SC adapter, MTP-LC or MTP-SC patch cable etc, of which MTP-LC cassette is more widely used. As an assembly of the high density MTP/MPO pre-terminated fiber devices, it is dominant in high-density data centers for its reliable interface, optimized performance and minimized rack space. There are commonly three types of MTP cassettes available in market, including MTP LGX cassette, MTP HD cassette and MTP TAP cassette. This article will introduce the advantages of MTP HD cassette and MTP TAP cassette over the standard MTP LGX cassette.

FS.COM MTP cassette

MTP HD Cassette Over MTP LGX Cassette

Though the MTP cassette is preferred for its high density, there is still difference in used rack space between MTP LGX cassette and HD cassette. For standard LGX cassette, usually 3pcs of LGX cassette are put inside a 1U19’’ rack, or 12pcs inside a 4U 19’’ rack, as shown in the figure below. However, HD cassette is more optimized for high-density applications than LGX cassette for being more compact in package. 5pcs of HD cassette can be put inside a 1U 19’’ rack. So if the space for a data center is urgent to be saved, MTP HD cassette will be the best selection to help minimize the rack space for the most fiber count.

LGX cassette in 1U and 4U fiber enclosures

MTP TAP Cassette Over MTP LGX Cassette

TAP (traffic access point) is usually added to the network for network monitoring. MTP TAP cassette is an effective device for real-time monitoring in high performance network and high density cabling. TAP cassette integrates TAP functionality into cable patching system. A TAP uses a passive fiber optic splitter to create an exact copy of the light signal passing through it. The optical fiber carrying the signal from a device’s transmit port is connected to the splitter input; the splitter’s live output is connected to the receive port of the downstream device, while a second output carries the copy of the live signal for out-of-band access. A TAP uses two of these splitters, installed on the two fibers supporting both channels of a duplex fiber channel link, to create a complete copy of all traffic between the two devices. And the transmission for the network data will not be affected since there are ports for monitoring and ports for transmission. The MTP TAP cassette can adopt both the package of HD and LGX cassette. The MTP TAP cassette can be easily deployed in network by connecting to the monitoring device and the user device with MTP trunk/breakout cables or LC/SC patch cables. For this hardware tool, TAP cassette is more expensive than the other two cassette types.


This article compares two MTP cassettes with the MTP standard LGX cassette and states the advantages of them. So if space is the primary consideration in high density cabling, MTP HD cassette is a better design choice; if a secure network with high performance is the priority, MTP TAP cassette is recommended to be deployed in the network. For special applications where high density and monitoring are both required, MTP TAP cassette with compact design is the best choice!

Fiber Protection Sleeve Secures Your Fusion Splices

Fiber optic splicing, especially fusion splicing, has become increasingly important for OSP (outside plant) deployment. The process is by joining the two fiber ends to create longer cable runs. As we know, spliced bare fibers are fragile to be easily breakable. Therefore, a good protection for the spliced fibers during fiber optic splicing is extremely necessary. Luckily, a small component named fiber protection sleeve perfectly solves the issue. It acts as a strong coat for the fiber splices to prevent unpredictable fractures. This post will take you to understand the basic knowledge about fiber sleeve.

Construction of Fiber Sleeve

Generally speaking, a fiber sleeve consists of three parts. The first part is the inner tube made by hot-meltable adhesive. This material can encapsulate the fusion splice joint and provides vibration damping and an environmental seal so as to protect the fiber from damage and contaminants. The second part is a reinforcing strength member outside the inner tube. The strength member can be made of stainless steel, ceramic or non-metallic. It offers extra rigidity to prevent misalignment, micro bending or breakage of the fiber. The third part is the heat-shrinkable outer tube made of cross-linked polyolefin. This tube provides an instant shrink-force and drives the adhesive liner into all areas of the splice and excludes all the air. The following picture shows the structure of a fiber protection sleeve.

fiber sleeve-structure

How Does It Work?

When the optical fiber is melt during the fusion splicing, the technician will use the sleeve on the melting point as a protection. Once the hot-meltable adhesive tube touches the melted fiber, it also melts to tightly wrap the fiber joint for the filling and sealing functions. Likewise, when the heat-shrinkable tube is heated, it shrinks to wrap the fiber joint, strength member and hot-meltable tube to form a unity preventing moisture and increasing fiber joint’s strength.

Two Types of Fiber Protection Sleeve

Single Fiber Protection Sleeve

This kind of protection sleeve is used for single mode fiber. Its strength member adopts the stainless steel needles to reduce fiber damage. Typical lengths are 40 mm and 60 mm. The sleeve color is selective, but most people would choose the transparent tube for better inspection of the fiber status.


Ribbon Fiber Protection Sleeve

The ribbon type is to protect ribbon splices of multiple fiber counts. The ceramic strength member is used to supporting the splices. Fiber counts in a ribbon sleeve vary from 2 to 12 fibers. The length of the sleeve is usually 40 mm. If stronger protection is required, you can choose the ribbon protection sleeves with double ceramic strength members.


Be Aware of These Precautions

While utilizing the fiber protection sleeves, there are some important precautions for operators to know. The benefits of the precautions are about avoiding unnecessary loss and securing the fiber for a long-term use.

  • Point 1, do not leave air bubbles in the protection tube. This ensures the long-term reliability of the fiber splices.
  • Point 2, the tension applied to the fiber should be uniform so that the fiber can stay straight in the protective sleeve.
  • Point 3, the tension applied to the fiber should not be too large in case fiber cracks increase.
  • Point 4, try to avoid fiber twisting. Because this may cause micro-bending and unnecessary fiber loss.
  • Point 5, do not release the tension until the heat-shrinkable tube is completely shrunk, cooled and shaped. This can avoid uneven heating which leads to fiber bending.


Fiber optic protection sleeve is usually used during the process of fiber optic splicing. Although the fiber sleeve is very small, it provides great support for the fiber joint. Single fiber protection sleeve and ribbon fiber protection sleeve are two common types in the market. All the above are available in FS.COM. If you are interested, please visit the website for more information.

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