Things You Need to Know About ADSS Fiber Cables

When it comes to OSP (outside plant) deployment, many types of fiber optic cables are used for different OSP applications. ADSS (all-dielectric self-supporting) cable is the type that is strong enough to support itself between structures without using conductive metal elements. It is often installed along aerial transmission lines to be a communication medium for electrical utility companies. Both single-mode and multimode fibers can be arranged in ADSS cables. And when using single-mode fibers, the cable can carry the maximum of 144 fibers. But do you know the basic structures of ADSS cable? What are the advantages of using ADSS cable? And how can you prevent ADSS cable from damage? This article will give you all the answers.


Structures of ADSS Cable

There are generally two kinds of structures for ADSS cable. One is called as central tube structure. From the following picture, the fiber of a certain length is placed in a PBT loose tube filled with water-blocking material. Then it is wrapped with aramid yarn according to the desired tensile strength and extruded with PE or AT sheath. This structure has a smaller diameter and lighter weight. But the fiber length is limited.


The other type of structure is called as stranded structure. The following picture shows that the fiber loose tubes are surrounding around a central strength member (usually as FRP material). And the rest parts are similar to the central tube structure. This type is able to obtain longer fiber length. Although the diameter and weight is relatively big, it is better to be deployed for large span applications.


Benefits of ADSS Cable

There are many advantages of using ADSS cable. The overall weight and diameter of the cable are small which is a relief to the towers and poles. And its total transmission range is large enough to reach up to 1200 meters. Using the polyethylene sheath will also protect the cable from corrosive effect. ADSS cable’s non-metallic structure makes it possible to be anti-lightning. And the aramid yarn helps the cable to have good tensile performance and temperature performance under extreme weathers. The maximum lifespan of ADSS fiber cables can even reach up to thirty years.

Precautions for ADSS Cable Damage
  • Point 1, since many cables are running through mountainous areas, it is inevitable that the cables will be scratched or bent when come across trees or rocks. Especially for the cable sheath damage, it will greatly harm the service life of cable because the surface can be corroded once exposed to the dust and salty environment. Thus, the cable installation should be under careful examination and monitoring.
  • Point 2, due to the partial force during the line construction, common accidents like broken fiber and high loss point can be occurred. Lots of people think it is the problem of cable quality, but actually it is because of the wrong construction process. Therefore, taking control of the constant tension at a uniform speed during installation is very important.
  • Point 3, another common damage is the broken fiber at strain towers. This is because of the wrong operation or partial force on fibers. During the construction, installers must pay attention to the proper angle and pulling direction of fibers to avoid such accidents.

ADSS fiber cable is ideal for installation in distribution as well as transmission environments. It does not need support or messenger wire, a single pass is sufficient for installation which make it a cost-effective and simple way of setting up fiber optic networks. With careful installation, this type of fiber optic cable can bring much convenience for the proper application.

Choose the Right Patch Cable for Your Transceiver Module

To a large extent, a fluent data transmission relies on the seamless transition between patch cables and fiber optic transceivers. As high bandwidth gradually dominates the market, patch cables and transceivers become much more essential to data transmission, especially for data transmission between the switches and equipment. But when you try to find the right patch cable for your transceiver, you may feel dazzling about the great variety of products. Don’t worry, this article will help you find the quickest way to choose the suitable product. But first, let’s have a look at the basic knowledge about patch cables and transceiver modules.

Overview of Patch Cables and Transceiver Modules

A patch cable or patch cord is an electrical or optical cable used to connect one electronic or optical device to another for signal routing. It is composed of an electrical or optic cable terminated with connectors on the ends. Optical patch cables are now widely used in data centers for data transmission. They have different fiber connectors including LC, SC, ST, FC, MTRJ, E2000, MU, MPO/MTP, etc. As for fiber types, there are also single-mode patch cables and multimode patch cables. Single-mode patch cables can further be classified into OS1 and OS2. While the multimode can be further divided into OM1, OM2, OM3 and OM4.


Transceiver is a self-contained component that can both transmit and receive. It is often inserted in devices such as switches, routers or network interface cards which provide one or more transceiver module slot. Many transceivers types, such as SFP, X2, XENPAK, XFP, SFP+, QSFP+, CFP, etc. are used for various applications. The transceiver accepts digital signals from the Ethernet device and converts them to optical signals for transmission over the fiber.

Several Aspects to Consider
Transmission Media

Two kinds of transmission media can be found in the network. They are optic fiber cable and copper cable. Therefore, transceivers also have two types based on transmission media — copper based transceivers and fiber optic based transceivers. Copper based transceivers like 100BASE-T SFP, 1000BASE-T SFP are the commonly used types. They have a RJ45 interface to connect with the copper cables. Generally, cat 5, cat 6 and cat 7 cables attached with RJ45 connectors are typically linked to the copper based transceivers.

Compared with copper based transceivers, fiber optic transceivers support higher data rates for over 100 Gbps. The supported fiber patch cables are more complicated for selection. Usually single-mode and multimode fiber patch cables are used. But according to different transmission rates and transmission distance, further choices should be made.

Transmission Rate and Distance

It is known that data rate decreases as the transmission distance increases in fiber optic cables. Multimode fiber optic cables are often used for short distances due to the high cost of single-mode optical cables. But single-mode patch cables have better performance for different data rates in both long and short distances. Thus, if your transceiver supports high data rate over long distance, single-mode should be a better choice, and vice versa.

Transceiver Interface

Interfaces are also important to the selection of patch cables that match with transceivers. Optical transceivers usually use one port for transmitting and one port for receiving. Cables with duplex SC or LC connectors are typically employed to connect with this type of fiber optic transceivers. However, for BiDi transceivers only one port is used for both transmitting and receiving. Thus, simplex patch cables are used with BiDi transceivers.

Other high data rate transceivers like 40G/100GBASE QSFP+ often use MTP/MPO interfaces. They should be connected to the network with multi-fiber patch cords attached with MTP/MPO connectors. If these ports are used for 40 G to 10 G or 100 G to 10 G connections, fanout patch cables should be used.



Knowing the transmission media, transmission data rate and distance, transceiver interfaces can give you a general direction of which type of patch cables should be chosen. Only matched patch cables and transceiver modules can provide better performance.

Applications of Special-Purpose Fiber Patch Cables

Fiber patch cable is an indispensable part for fiber optic communication. Signals are depending on this device to finish data transmission. Standard fiber patch cables are the most common patch cables in the market. However, there are some specific applications that need special treatment. Therefore, a range of special-purpose fiber patch cables have emerged as required. This article will recommend several unique but useful fiber patch cables. Maybe one of them will suit your needs.

HD TAB Fiber Patch Cable

As the name suggests, HD TAB fiber patch cable has a special push-pull tab which provides great convenience for high-density installations. Technicians can have easier finger access to installing or releasing the cables without using any additional tools. In today’s market, HD TAB fiber patch cables are usually terminated with LC or MTP/MPO connectors. If you are seeking for a high-density and space-saving solution, HD TAB fiber patch cable is highly recommended.


The uniboot LC fiber patch cable bundles two fibers in a single patch cord which saves much space for cabling. The changing of its LC uniboot connector polarity is easy ,which skips the using of tools. Uniboot LC fiber patch cable is available in different fiber types of single-mode, OM3 and OM4. The purpose of this cable is to deliver maximum connectivity performance in a minimal footprint. If you want to achieve an easier cable management, this is definitely a good choice.

In addition, there is an upgraded version of uniboot LC fiber patch cable – HD uniboot LC fiber patch cable. You can’t miss this one if you are looking for the extreme space saving solution. It is basically the combination of uniboot LC fiber patch cable and HD TAB fiber patch cable. Likewise, two optical fibers are wrapped together in a single strand. The difference is that its connector is attached with a push-pull tab which is more flexible for releasing the connector. It can be applied to data centers and high-density environments.


In terms of data security, keyed LC fiber patch cable or secured LC fiber patch cable is the perfect solution. It is designed to prevent unauthorized and inadvertent changes in highly sensitive applications. Keyed LC fiber patch cable is identified by the connector color. Each color of a set of keyed LC connectivity products represents a unique keying pattern that only allows matched color mating. Multiple keyed LC connectivity products are included in this family. The picture below gives an example of the simplex keyed LC connectivity.


Originally, when bending an optical fiber by stress, there will be a bend loss. This sensitive nature of optical fiber causes low efficiency in optical transmission. But it is hard to deal with the problem as bend loss issue is difficult to locate. Fortunately, bend insensitive fiber patch cable is designed to solve this problem. In this kind of cable, a layer of glass is added around the core of the fiber which has a lower index of refraction that literally “reflects” the weakly guided modes back into the core. Many data centers and FTTH systems are deploying this cable to reach lower signal loss.


From this article, we can see that there still exists many other types of fiber patch cables. And special fiber optic cable solutions are always more effective to special applications. By the way, if you just want a standard optical cable, you may consider from the aspects of fiber type, connector type, connector polishing type, fiber count, cable jacket, etc. These options are fit for average circumstances when choosing the optical cables. Hope you choose the right one according to your requirements!

Fiber Optics Based on Multi Point Fiber Distribution Systems

Multi point distribution system is the broad wireless technology used to deliver voice, data, Internet, and video services. It has been allocated for that deliever broadband services in a point to point or point to multi point configuration to residential and commercial customers. As a result of the propagating characteristics of signals so that the systems use a cellular like network architecture, though services provided are fixed, not mobile.

In some cases fiber distribution systems have an ability to connect several remote sites to one base station. One common application is that the repeaters based on a major building and others building such as RF shielding areas and basement which all located in a few miles repeater building. A and the repeater use the head end. A multiple fiber optic transceiver assembly at the base station is commonly called a “head end” The distance end of the fiber is called “remote hub” equipment.

fiber distribution systems

We need to pay attention to that each fiber optic receiver output at the repeater site has individual pads to reduce the composite noise floor. For example, if used the 40dB, an additional 80 dB of combiner port-to-port isolation occurs. In real application, it is a good idea, including regard the taps at test point to read the RF levels. Just used for testing and protection. A similar system that when we used the WDM, if the numbers of fibers are reduced by 50% but a WDM must be added at each remote site and another WDM for each fiber added at the repeater site. In the 4 remote site example, it would be taking 8 WDM’s to operate all the fibers full duplex and 4 fiber optic transmitters would have to be 1550nm models. Then there also a point we need to be careful. Fiber optic transceiver is not frequency selective and the same unit can receive 1330 or 1550nm optical signals equally well. We also measured the noise performance and we are happy to inform you that in line with theory, optic splitters practically do not add any noise. No matter what output we tested, this means that your receiver connected to such network would also show very high quality readings.

When we use the fiber optic links in the fiber distribution system, sometimes we need fiber optical splitter to split the signal which carried. The systems designer has the choice of splitting either the optical or RF domain. The function of optical splitter is familiar to RF splitter. Other parts of the incoming fiber optic network are connected to the transmission of output, and the terminal device is connected and the another main part is its direct part. There are also splitters that divided the input into 2, 4 or more outputs. According to the structure and locations of fiber optic splitter, in the fiber optic network, we need different split ratios of splitter, such as 1×2, 1×4 and 1×8 splitter and so on. Moreover unused single mode fiber cable, specific products can see at 50m single mode, it also can strengthen the signal used for the RF over fiber systems between the connected buildings for data communication and spare fibers.

Some Notes Of Buying Fiber Pigtails

In any fiber optic cable installation, the way the cables are attached to the system–is vital to the success of the telecommunications network. If done well, the connection allows optical signals to pass with low attenuation and little return loss. One of the proven ways to join optical fibers is with a fiber pigtail–a fiber cable with a installed connector on one end and unterminated fiber on the other end.

Pigtails are basically cable assemblies. Ninety-nine percent of singlemode applications use pigtails, also used in many multimode applications. One of the benefits of using pigtail is lower labor costs. The end of the pigtail is stripped back and fusion spliced to another single fiber. This is done easy in field with a multi-fiber trunk to break out the multi-fibers cable into its component for connection to the end equipment. Installers working with singlemode fiber typically have access to a fusion splicer–an expensive piece of equipment that costs $6000 to $30,000 or more. With a fusion splicer you just splice the pigtail right onto the cable in a minute or less.

Pigtails bridge a critical junction in the fiber-optic network. Pigtails consist of–a connector, a ferrule, standard fiber and jacket types, including singlemode and multimode varieties. The most important element you should know is that the quality of the connector itself. You need to know certain characteristics, such as insertion loss, the type of polish used and how well the connector is terminated to the cable. As fiber cable termination is the addition of connectors to each optical fiber in a cable. The fibers need to have connectors fitted before they can attach to other equipment. Two common solutions for fiber cable termination are pigtails and fanout kits or breakout kits.

Ferrule material, whether zirconia ceramic, plastic or stainless steel, must also be specified when buying a pigtail. If you go with a metal ferrule, it is a waste for any singlemode application.

The length of the pigtail is another element that must be specified. The extra slack allows for splicing errors to be corrected, without it, you may have to start with another pigtail.

Pigtails can have female connectors and be mounted in a wall mount or patch panel, often in pairs although single-fiber solutions exist, to allow them to be connected to endpoints or other fiber runs with patch cables. Alternatively they can have male connectors and plug directly into an optical device. Pigtails are different from patch cords, as both ends with connectors, like common patch cord LC-LC.

Testing a pigtail in the field is not easy. The unterminated end is difficult to check until the pigtail is actually spliced to the equipment.
Quality is typically high because the connectorized end is attached in a controlled environment–FiberStore. FiberStore can make singlemode pigtails more accurately than a field termination can be done.