How to use 24 Fibers MPO/MTP cable in 40G/100G networks?

With the increase in business volume and users’ demand for greater bandwidth, large-scale enterprise networks have begun to upgrade from 10G to 40G to 100G, among which 24 fibers MTP/MPO cable plays an important role. So how much do you know about 24 fibers MTP/MPO cable solution? How should 24 fibers MTP/MPO cables be applied in 40/100G networks? You will get more detailed information after reading this article.

What is 24 fibers MTP/MPO Cabling?

24cores MTP/MPO cabling is a high-density wiring solution based on 24 core MTP/MPO cables. Compared with 24 fibers cabling that uses three 8 fibers MTP/MPO cables or two 12 fibers MTP/MPO cables, one 24 fibers MTP/MPO cable can provide higher density.

24 fiber MPO/MTP Cabling in 40G/100G Network Solution

Compared with the traditional single-core dual-core optical fiber cabling, the 24 fibes MPO/MTP cabling has more advantages to some extent. Although the duplex LC connector occupies the same space as a single MTP connector, a single MTP connector can support 24 cores and can achieve a higher connection density. Therefore, when the network grows from 10Gbps to 40G or 100G, it will use 24 fiber MTP/MPO structured cabling, which is convenient to support more and more advanced applications (such as AR, VR). 24 fibers MTP/MPO cabling based on 24 fibers MTP/MPO cables can provide different types of solutions for 40G/100G networks. The following four typical 24 fibers MTP/MPO cabling solutions.

Solution 1: 24 fiber MTP/MPO Cable based Cross Connection

As shown in the figure below, the 24 cores MTP/MPO fiber jumper can be converted from 24 fibers to dual-core by using a 24 cores MTP-LC fiber distribution box. Among them, polarity B MTP/MPO fiber optic patch cords and 8-core/12-core MTP fiber optic patch cords have a similar way to manage port polarity. Compared with 8-core and 12-core MTP fiber optic patch cords, 24-core MTP fiber optic patch cords can achieve higher port density, which is three times that of 8-core MTP fiber optic patch cords and two-core MTP fiber optic patch cords. Times. In addition, for the realization of 144 cores, the area occupied by the 24-core MTP connector is about 30% less than that of the 12-core MTP connector. Because of this, the 24-core MTP fiber jumper is much higher. Density applications are welcome.

Solution 2: LC Fiber Patch Cord based Cross Connection

Different from the MTP/MPO cross-connection, this solution is suitable for the situation with limited 24core MTP/MPO fiber jumpers (that is, there is no additional 24-core MTP/MPO fiber jumper). In order to increase network flexibility, two 24core MTP/MPO fiber jumpers are used. Use MTP/MPO-LC optical fiber distribution box and duplex LC optical fiber jumper to establish a communication link between the lines. This deployment can realize dual optical fiber and parallel multi-fiber connection on the optical fiber.

Solution 3:  Adopt with MTP/MPO branch Cables

Different from solution 1, the MTP/MPO branch fiber optic patch cord and MTP/MPO fiber adapter panel in this solution replace the MTP/MPO-LC fiber distribution box and LC fiber optic patch cord combination part in solution 1. This change greatly increases the panel The connection density on the. In this solution, the 8-port 24-core MTP/MPO optical fiber adapter panel can support up to 192-core optical fiber. For QSFP applications, the density of a 24-core MTP/MPO adapter panel under the same port (such as 8 ports) is three times that of an 8-core MTP panel.

Solution 4: MTP/MPO Trunk Cables Parallel Connection

Compared with 8fibers/12fibers MTP/MPO cabling, 24fibers MTP/MPO cabling can support a wider range of parallel applications. For example, 24fibers MTP/MPO cabling can provide 100G SR-10 applications with only ten pairs of 10x10G configuration multi-mode fiber to achieve connection, even if some vendors have extended 100G SR-10 applications to provide 12x10G (120G), 24-core MTP/MPO fiber jumper can also provide the simplest and direct connection for its application.

Among them, in 120G parallel applications, 120G ports can be configured as 12 independent 10G links, and then connected to the server through a 24-core MTP-12LC duplex branch fiber jumper. At the same time, it can also be configured as 3 40G links, connected to the network switch through a 24-core MTP-3×8-core MTP fiber jumper.

To sum up

24 fibers MTP/MPO cabling based on 24-core MTP/MPO cables connection is the most cost-effective solution for deploying parallel and duplex fiber applications. Compared with three 8-pin MTP/MPO connectors and two 12-pin MTP/MPO connectors, 24-pin MTP/MPO connectors provide higher density and effectively shorten the cleaning and inspection time during MTP system installation.

If you need any support on MPO/MTP cables, Fiber-mart.com has a complete range of products and is favored by major data equipment manufacturers. The wide variety of optical transceiver modules and sufficient inventory provide you with flexibility while also saving costs. If you need any help, feel free to contact us sales@fiber-mart.com

The Wrong Connection May Happen for 24core MPO/MTP Cabling

Since the establishment of the 40GBASE-SR4 and 100GBASE-SR10 standards in 2010, many people regard 24-core connection as an ideal network migration solution for data centers. Compared with 12-core fiber optic cabling, the use of 24-core patch cords can save half of the space and reduce the number of fiber optic cables required. As a result, the number of fiber cable channels required is reduced accordingly, making the data center easier to manage. Although the 24-core MTP/MPO fiber optic jumper solution is being welcomed by most people, many people still don’t really understand MPO/MTP connection. Below we briefly cite two error-prone concepts about the 24-core MPO/MTP connection.

Point One in MPO/MTP Cabling

The new standard stipulates that the number of fiber cores required for a 100G network connection will be reduced compared to the 20-core fiber jumpers commonly used today. Therefore, many people will think that 24 core connection is not necessary. At this stage, the 100GBASE-SR10 standard defined by IEEE802.3ba stipulates that 100G networks must use 10-channel multimode optical fiber for transmission at 10Gb/s. Compared with the previous standard, the number of channels used has been reduced. From this point, we can see that network technology has indeed made considerable progress.

At present, there is a new standard about the use of 4-channel multi-mode fiber for transmission at 2.5Gb/s. This standard only requires 8 fibers (four for sending data and the other four for receiving data). It is the same as the current 4OGBASE-SR4 standard. This also means that the 12-core MPO/MTP connector can support a single 100G channel. However, it is very unreasonable to use a 12-core MPO/MTP connector for a transmission channel that only requires 8-core optical fiber, because this will cause the idle waste of the other 4 cores. Therefore, we usually choose another solution to replace it, connecting a 24-core MTP connector with three 8-core 100G transmission channels on a jumper, so as to optimize resource allocation. Connect three 8-core 100G transmission channels on each jumper, so that each fiber can be used reasonably.

If the above example is not enough to convince you, then let us look at another example. If you need to use the 4*2.5Gb/s transmission standard to support the transmission of 12 100G channels, and if you choose a 12-core MPO/MTP connector, you will need 12 less connectors and a total of 144 fiber cores. Although this can also achieve the transmission effect we want, it will cause 33% of the optical fiber to be wasted. However, the use of 24-core connectors can optimize resource allocation to the greatest extent. Only four fiber jumpers (96 fibers in total) are needed, and all cores can be used. In this way, the 12-core MPO/MTP connector increases the investment cost, which is contrary to the design intent of the data center infrastructure system.

Point Two in MPO/MTP Cabling

Some people believe that more fiber cores will result in more insertion loss, so 24-core connectors are not as cost-effective as 12-core connectors. Indeed, in the jumper deployment of the data center, the insertion loss is a key parameter. In an optical fiber system, if the insertion loss is small, the data transmitted is more accurate. For example, the 40/100GbE standard defined by IEEE802.3ba stipulates that the insertion loss of OM3 fiber must be controlled within 1.5db within a transmission distance of 100M. If the insertion loss increases, then this means that the data transmission distance will be shortened. However, with the current trend of using distributed access/aggregation switches in data centers, the backbone will be shortened. However, with the current trend of using distributed access/aggregation switches in data centers to increase, the trend of extending the backbone network by 100M has declined.

Some people mistakenly believe that more fiber cores will lead to more insertion loss, and use the phenomenon that a 24-core connector has a loss of 0.5db to support this view. In fact, whether it is a 12-core MPO/MTP connector or 24-core MPO/MTP connector, the loss specified by the industry standard is not more than 0.5db. What’s more, if the correct polishing technology is used, the performance of the 24-core MPO/MTP connector and the 12-core MPO/MTP connector is almost the same.

The MPO/MTP connector provided by fiber-mart.com is of low insertion loss, which is consistent with the insertion loss of 12-core MPO/MTP components. Its components are in strict compliance with the IEEE802.3ba standard, and the reduction in insertion loss enables data transmission to be farther. This also shows that the number of cores cannot be used as a criterion for considering the performance of the connector.

MPO/MTP ASSEMBLIES – THE GAME CHANGER OF DATA CENTER CABLING

High-density data center is becoming the direction of the next generation data center. Today density is the key factor that determines the capacity of the facility. Parallel optics technology has become the transmission option of choice in many data centres as it is able to support 10G, 40G, and 100G transmission. For parallel optics to work effectively, it requires the right choice of cable and connector.

An optical fiber connector terminates the end of an optical fiber, and enables quicker connection and disconnection than splicing. The connectors mechanically couple and align the cores of fibers so light can pass. Better connectors lose very little light due to reflection or misalignment of the fibers. In all, about 100 fiber optic connectors have been introduced to the market. MPO/MTP® connector – “multi-fiber push on” technology with multi-fiber connectors offers ideal conditions for setting up high-performance data networks in data centers to handle future requirements.

MTP/MPO cabling assemblies, as an excellent solution for quick and reliable multi-mode fiber connectivity, provide an effective way for 40GbE and 100GbE network solutions, ensuring a high-performance and high-speed network

The MTP® connector is a registered trademark and design of UsConnec. It is also a kind of MPO connector but with a higher performance which provides some advantages over a generic MPO connector. Compared to generic MPO connector, MTP® is designed with multiple engineered product enhancements to improve optical and mechanical performance.

MT stands for mechanical transfer and an MT ferrule is a multi-fibre (usually 12 fibres) ferrule. The performance of the connector is determined by the fibre alignment and how this alignment is maintained after connection. Ultimately, the alignment is determined by the eccentricity and pitch of the fibre and how accurately the guide pins keep the fibres together during mating. The performance of any MPO connector can be improved if the tolerances of the pins and the moulding processes are reduced during manufacture.

Nowadays, a MPO/MTP® connector can support 2, 4, 8, 12 or 24 fibers, and even up to 72 fibers in the tiniest of spaces. MTP/MPO fiber cables fall on MTP/MPO trunk cables and MTP/MPO harness cables. As terminated with MTP/MPO connectors on one end and standard LC/FC/SC/ST/MTRJ connectors (generally MTP to LC) on the other end, these cable assemblies can meet a variety of fiber cabling requirements.

MTP/MPO CASSETTES

MTP/MPO cassettes are utilized to interconnect MTP/MPO backbones with LC/SC/ST/FC patching, and reduce installation time and cost for optical networking environments. They are able to provide secure transition between MTP/MPO and LC/SC/ST/FC connector. The standard MTP/MPO cassettes can accommodate 12 and 24 port configurations.

MTP/MPO CASSETTES FEATURES

High density easy-plug cassette modules

Simple to use, convenient installation: Pre-installed with fiber MTP/MPO adapters at the rear, and LC adapters in the front panel. Reduces cable load in raised floors to existing active server/switch/storage equipment with LC Duplex interface.

Field terminations Elimination: reduces labour cost and improves cabling manageability.

Available in 12 fiber and 24 fiber configurations, up to 36 duplex ports or up to 72 single-mode fibers. For example, a 10G system would utilise a single MPO / MTP (12 Fibre) connector between the 2 switches.

High performance zirconia sleeve adaptors.

Reliability -100% tested factory tested in a controlled environment.

The gender can be changed after assembly or even in the field giving flexibility at point of use.

The MTP connector has a metal pin clamp with features for centering the push spring

eliminates lost pins

centers the spring force

eliminates fibre damage from the spring mechanism

APPLICATIONS

Data centre infrastructure

Storage area network

Fibre channel

Parallel optics

Ultra High Density Fiber Management

Telecommunications networks and Broadband CATV networks.

LAN/WAN Premises

Therefore, parallel optics and MTP cabling have proven to be an excellent solution for delivering 10G, 40G and 100G transmission especially within a data centre environment. It provides a flexible, high density option for quickly connecting services and is a reliable high speed solution for many data networks.

WHICH FIBER PATCH CORD SHOULD BE USED FOR DIFFERENT TRANSEIVER TYPES?

Fiber Optic Networks have many features, ready to fulfill every customer’s needs for bandwidth, stability, reliability and most important cost-effective network architecture. There are many manufacturers that are offering their products on the market. Fortunately, most of their products are compatible between them, meaning we can mix and match different products from different manufacturers. However choosing the correct equipment for a specific network design is not a simple task. We must be really good prepared and we must know the properties of every single component of the fiber optic network in order to achieve a stable network architecture with possibility for future upgrades.

One of the key aspects to focus on when designing and deploying a fiber optic network is the connection between the main transmission components, the optical transceiver and the optical fiber cable. The fiber optic transceiver is a type of self-contained, hot swappable component that has the capability to convert electrical input into optical signal and vice versa, and with the help of lasers transmit these optical signals (optical light) down the optical cable. They are a key component for the fiber optic network and its performance. They are inserted in devices like servers, storages, switches and routers in a dedicated port on the device itself. There are many Form-Factors of transceivers with various properties, however the most commonly used are SFP+, QSFP and QSFP28 transceivers. The SFP+ transceivers are Small Form-Factor transceivers capable for speeds up to 16 GB/s and up to 80 kilometers, depending on the fiber type. The QSFP and QSFP28 transceivers are Quad Small Form-Factor transceivers capable for speeds up to 40 GB/s and 100 GB/s. QSFP has a range of up to 40 kilometers and QSFP28 has a range of up to 10 kilometers on Single-mode fibers.

When it comes to fiber optic cables, or fiber optic patch cords, they are composed of a fiber optic cable with a fiber optic connector ending on each end. According to the application they would be used for, they can be divided in several categories:

Multi-mode or Single-mode

Simplex or Duplex

According their connectors

When buying an optical cable we must know the distance they would be used for because this is the deciding factor when choosing Multi-mode of Single-mode fibers. Multi-mode fibers can come in four different modes, OM1, OM2, OM3 and OM4 and each of these four modes have different reach capabilities. However Multi-mode fibers are used for short reach because of their bigger core which transmits wider wavelength. Single-mode fibers are used for long reach distances because they transmit a narrower optical light via their smaller, around 9 micrometers, core. Simplex and duplex option explains the number of fiber cores consisted in a fiber optic cable. As the name suggests, simplex consists of one fiber core, while duplex consists of two fiber optic cores. According to their connectors there are many different types of cables. The most common used are cables with duplex LC connectors and the MPO/MTP trunk and breakout fiber optic cable solution. There are also cables with SC, ST, FC, E2000 and other connectors.

When choosing the correct patch cords it’s important to know the compatibility with the transceivers. Their compatibility could be found in their datasheets. When choosing cables with appropriate connectors we should keep in mind that the MPO/MTP connector solutions are the future of optical networking because they can support speeds up to 100 GB/s and they provide a solid ground for future network upgrades. Today for 40 GB/s a 12-fiber MPO/MTP connector is used because only 8 fibers are needed for successful connection, four used for transmitting, four used for receiving and four are left unused. For 100 GB/s solutions the use of 24-fiber MPO/MTP connectors is a must. These MPO/MTP connectors provide a seamless upgrade to 40 GB/s and 100 GB/s solutions. The MPO/MTP connectors are generally used with various QSFP type of transceivers, especially with QSFP28 because QSFP28 transceivers support bandwidth bigger than 40 GB/s, up to 100 GB/s.

The LC connector stands for Lucent Connector because it was firstly designed by Lucent Technologies. This connector has a body build similar to RJ jack style. These connectors are generally used in telecom rooms and network closets of a given organization. They are most commonly used for reach up to 10 kilometers on Single-mode fibers and with SFP+ transceivers.

Today many leading IT managers are searching for a cost-effective solution while not thinking about the future. Even though it’s more expensive to purchase, the MPO/MTP solution provides a seamless upgrade to new technologies and greater money savings on a long run. Also because of the way they are functioning they consume less space and make the whole maintenance process less complex.

WHAT KIND OF FIBER POLISH BE USED

When a connector is mounted on the fiber end, some loss of power will be experienced. Some of the light would be reflected back to the fiber towards the source that generated that light signal. These reflected back signals into the fiber are called Optical Return Loss (ORL). The ORL can harm the laser source can also interrupt the transmission signal. Usually the fiber connectors have different polishing types, the different polishing have different ORL levels. There are four polishing types available, each having its own ORL levels and characteristic. The polishing types are: 1. Flat surface, 2. Physical Contact (PC), 3. Ultra Physical Contact (UPC) and 4. Angled Physical Contact (APC). Each connector is evolved from one into another, let’s discuss each on detail.

Flat Fiber Connector

Originally the fiber connectors are flat surface connectors. A small gap between the two fiber faces is left when two faces of flat fibers are coupled. These flat fiber connectors are not appropriate for single mode fiber with a 9µm core size, therefore it is vital to advance into Physical Contact (PC) connectors. ORL values in this type of connectors is around -35dB.

Physical Contact (PC) Fiber Connector

Physical Contact connector is polished with a minor spherical design, this allow to decrease the general size of the end face. The spherical design helps to overcome the air gap issue experienced in flat connectors. The spherical design results in overall lower ORL, as a reduced amount of light being sent back into the fiber and also to the light source. ORL values in this type of connectors is around -45dB. But still some of the light manages to reflect back towards the source.

Ultra Physical Contact (UPC) Fiber Connector

To overcome the issue faced in physical contact connectors, the convex end face is made by extending the polishing methods on PC connectors, resulting an even finer connector that is called Ultra Physical Contact (UPC) connector. The UPC have even lower ORL as compare to PC connectors. ORL values in this type of connectors is upto -55dB. UPC fiber connector can be used with single-mode fiber as well as multimode fiber. Usually the blue color UPC connector is used for single-mode fiber and beige color UPC connector is used for multimode fiber. UPC allows more consistent signals in digital TV and telephony systems.

Previously discussed PC and UPC connectors have a low insertion loss, but ORL really depends on the surface finish of the fiber. When the connectors are repeatedly coupled and decoupled, the ORL will start to degrade. So it is essential for a connector with low back reflection and it could endure repeated coupling and decoupling without ORL degradation.

Angled Physical Contact (APC) Fiber Connector

The end faces of Angled Physical Contact (APC) connectors have curved edges but are angled at 8 degree of an industry standard. This allows even closer connection with a much smaller gap between two. The combination of angled connector with smaller gap, allows any reflected light that is reflected back into the fiber is in fact reflected into the fiber cladding. That is because of the 8 degree angled face. ORL values in this type of connectors is less then -65dB. This to be noted that these types of fiber connector can only be used with single-mode fiber. 

It’s vibrant from above discussion that all types of connectors play important role and are available in market. It seems difficult to conclude that which connector is best to use. The specific application requirement chooses which one to use. For application like high accuracy optical signals APC connectors may be selected, on other hand less complex systems will work fairly well using UPC or even FC connectors.

 WHAT IS SFP+ OR A SFP TRANSCEIVER

SFP stands for small form-factor pluggable it is a compact hot pluggable transceiver used for both telecom and the data applications. LC connectors are used to connect fibers to SFPs. SFP module has two sides, first side known as transmitter it has laser for transmitting and other side known as receiver side has a photo detector. So basically SFP is a transceiver module since it has transmitter and the receiver in a single unit.

SFPs are not standardized by any single body, but relatively are specified by a multi source agreement also called MSA. It is an agreement between several manufacturers to make products which are compatible among different vendors. SFP designed based on the bigger gigabit interface converter (GBIC) interface, but it has a much smaller size in order to increased port density, that is why SFP is also called mini- GBIC.

SFP modules are used in all types of network applications like data networks, telecommunication networks, SAN as well as SONED/SDH.

Typical SFP modules can be classified based on the working wavelengths and its working distance so let’s take a look at the list here:

For multimode fibers the SFP modules called SX (short reach) module, it use 850 nanometer wavelength. The distance that SX modules support depend on the network speed, for 1.25 gigabit per second speed the distance achieved is about 550 meters, whereas for 125 gigabit per second speed it supports up to 150 meters

For single mode fiber side there are lots of choices, following are the most common types:

For single-mode fibers the SFP modules called LX (long reach) module use 1310 nanometer wavelength laser and supports up to 10 kilometer. EX module use 1310 nanometer wavelength laser and supports up to 40 kilometer. ZX module use 1550 nanometer wavelength laser and supports up to 80 kilometer. EZX module use 1550 nanometer wavelength laser and supports up to 160 kilometer. CWDM and DWDM SFP transceivers are also used at different wavelengths for reaching several maximum distances. Also there are Gigabit Ethernet UTP copper cable modules available.

As mentioned earlier SFP module supports speed up to 4.25 gigabit per second and an enhanced version which is called SFP+ supports more than 10 gigabit per second and SFP+ is becoming more popular on 10 gigabit ethernet.

The enhanced small form-factor pluggable (SFP+) is an improved kind of the SFP that supports data rate up to 16 gigabit per second. SFP+ supports 8 gigabit per second Fibre Channel, 10 Gigabit Ethernet and Optical Transport Network standard OTU2.

10 gigabit per second or commonly called SFP+ modules, are precisely the same sizes as regular SFPs, permitting the equipment producer to re-use present physical designs for 24 and 48 port switches and modular line cards.

The advantages of using SFP or SFP+ is, these both transceivers are typically the size of an RJ-45 ethernet port. As compared to GBIC, XENPAK or XFP modules SFP and SFP+ uses small area and standardized size of connectors. SFP sockets are commonly found in Ethernet switches, routers, firewalls and Optical Line Terminal commonly called OLT.

Recent optical SFP transceivers also support Standard digital diagnostics monitoring (DDM). This feature is commonly known as digital optical monitoring (DOM). DOM capable SFP modules give end user the ability to observer parameters of the transceiver, such as transmitted optical power, received optical power, transceiver supply voltage, laser bias current, as well as temperature of SFP in real time. This feature is commonly applied for monitoring on switches, routers and optical equipment via SNMP.

Since these SFPs are specified by a multi source agreement, which permits compatibility among different vendors. So a single SFP purchased can be used from Cisco switch to Juniper Router and from HP server to Huawei OLT. Also SFP modules are hot pluggable, so unlike other network components/cards there is no need to power off the device when inserting the SFP.