Tag Archives: fiber optic cables

CWDM DWDM Networking Solutions

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Wavelength division multiplexing is a cost effective and efficient way for expanding the fiber optic transmission capacity, because it allows using current electronics and current fibers and simply shares fibers by transmitting different channels at different color (wavelength) of light.

Wavelength Division Multiplexing, WDM is a technique that multiplexing several signals over a single fiber optic cables by optical carriers of different wavelength, using light from a laser or a LED. According to the number of wavelengths it supports, there are Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM).

CWDM was introduced as a low-cost approach to increasing bandwidth utilization of the fiber infrastructure. By using several wavelengths/colors of the light, 18 channels are viable and defined in the ITU-T standard G.694.2. CWDM systems typically provide 8 wavelengths, separated by 20nm, from 1470nm to 1610nm.

Benefits of CWDM
Passive equipment that uses no electrical power
Extended Temperature Range (0-70C)
Much lower cost per channel than DWDM
Scalability to grow fiber capacity with little or no increased cost
Protocol Transparent
Simple to install and use

Drawbacks of CWDM
16 channels may not be enough
Passive equipment offers no management capacities

DWDM packing WDM channels denser than in CWDM systems, 100 GHz spacing (approx. 0.8nm), more channels and higher capacity can be achieved using DWDM. IUT-T recommendation G.694.1 defines the DWDM channels spectrum. DWDM comes in two different versions: an active solution and a passive solution. An active solution is going to require wavelength management and it a good fit for applications involving more than 32 lines over the same fiber. In most cases, passive DWDM is looked at as a more realistic alternative to active DWDM.

Benefits of DWDM
Up to 32 channels can be done passively
Up to 160 channels with an active solution
Active solutions typically involve optical amplifiers to achieve longer distances

Drawbacks of DWDM
DWDM is very expensive
Active solutions require a lot of set-up and maintenance expense
“Passive” DWDM solution still requires power

Optical Add/Drop Multiplexing (OADM)
By optical add/drop multiplexing techniques, wavelength channels may be added and dropped at intermediate nodes using passive optical components only. Optical Add/Drop Multiplexers are used in WDM Systems for multiplexing and routing fiber optic signals. They can multiplex several low-bandwidth streams of data into a single light beam, and simultaneously, it can drop or remove other low-bandwidth signals from the stream of data and direct them to other network routers. There are CWDM OADM and DWDM OADM.

FiberStore offer a wide range of WDM optical networking products that allow transport of any mix of service from 2Mbps up to 200Gbps. Our highly reliable WDM/CWDM/DWDM products include CWDM multiplexers and demultiplexer, DWDM Multiplexers and demultiplexers, CWDM & DWDM Optical Add-drop Multiplexer, Filter WDM modules, CATV amplifier, OEO converters as well as many other most demanding CWDM DWDM networking infrastructure equipment.

OM3 Multimode 10G Aqua Fiber Optic Cables

The Internet, telephone calls, and cable television all transmit information that can pass through fiber optic cables. Imagine having all this information at lightning-fast speed with less signal disturbances. The mechanics that lie beneath the ingenious work of fiber optic cables rests simply with the fact that light travels faster than electricity with fewer disturbances. The end result? Fiber optic cables provide a quicker and clearer transmission of data. Designed for optimal performance, our fiber optic cables allow you to enjoy the best quality technological experiences possible.

Now, many fibre optic cable suppliers provide a full range of bulk fiber optic cable. Including om3 fiber optic cable, om4 multimode fiber, armored fiber cable, simplex fiber optic cable, multimode duplex fiber optic cable and so on. Today, I will recommended the OM3 fiber optic cable in this blog. Know more OM3 fiber optic cable info and how to choose it.

OM3 10G fiber optic cables are used for 10Gigabit Ethernet applications. These cables are also called multimode OM3 10G Aqua fiber optic cables. Our OM3 10G cables come in various types including different connector types, cable structure and cable length. Our OM3 multimode fiber that are compliant to ISO/IEC 11801 standards. These cables are used for 10Gbps networks to meet the requirement of continuous growing of high data rates.

Big quantity information is generated every day on the internet and people need to exchange more and more information which in turn result in the demand of more and more bandwidth. IEEE802.3ae defined the 10Gigabit Ethernet standards used in LANs. OM3 10G multimode fiber optic cables are developed for such 10Gig Ethernet applications, they are with so called OM3 optical fiber, which is 50/125 type and with industrial acknowledged Aqua color. In FiberStore, we supply the OM3 cable standard color is aqua, but we also supply the customized color service,such as black, blue, orange, green, brown, slate, white, red, yellow, purple, rose, aqua or custom specified. We provide many types of OM3 products, including various kinds of OM3 fiber cable assemblies with various connectors like SC, ST , FC, LC, MTRJ, etc.

OTHER INFO: Which optical fiber should I choose, 50 micron or 62.5 micron?

Although 62.5 micron fiber was the most popular only a few years ago, 50 micron quickly gained market share and is continuing to do so. 50 micron fiber can have up to 20 times the bandwidth (data throughput capacity) of 62.5 micron. For identification purposes, multimode fiber, and also singlemode fiber, is often referred to by its performance level identified by ISO/IEC (International Organization of Standards and International Electrotechnical Committee), which is based on the fibers bandwidth capabilities. 62.5 micron multimode is referred to as OM1. 50 micron fiber is referred to as OM2, OM3 and the recently added OM4. As you would imagine, OM4 has greater bandwidth than OM3 and OM3 has greater bandwidth than OM2.

Fifty micron OM3 fiber is designed to accommodate 10 Gigabit Ethernet up to 300 meters, and OM4 can accommodate it up to 550 meters. Therefore, many users are now choosing OM3 and OM4 over the other glass types. In fact, nearly 80% of 50 micron fiber sold is OM3 or OM4.

If you require higher data rates or plan on upgrading your network in the near future, laser optimized 50 micron (OM3 or OM4) would be the logical choice.

We also supply 10Gig multimode fiber optic cables with various optional structures, such as om3 multimode fiber, om4 multimode fiber, multimode duplex fiber optic cable and so on. Our  fiber optic cables are manufactured according to industrial standards and they feature the good price and reliable quality. Per foot price of each fiber cable is flexible depending on the quantities of your order, making your cost of large order unexpected lower. Customers can also have the flexibility to custom the cable plant to best fit their needs. Only fiber cable that meets or exceeds industry standards is used to ensure quality products with best-in-class performance.FiberStore is a your best buy fiber optic cable place.

Why Choose Shielded Cable for Cabling System?

Shielded VS. Unshielded Cabling

In copper structured cabling system at all levels, there are two main network cable technical types: Shielded and Unshielded cabling systems. Both types have been in existence since the earliest cabling standards were defined. Shielded cabling using shielded cable became popular from the outset in countries like Germany, Austria, Switzerland and France, while U/UTP was quickly adopted in the rest of the world. Although both systems work fine at 1 Gigabit Ethernet data rates, shielded systems can demonstrate superior performance at higher data rates such as 10G due to their ability to reliably support higher frequency transmission.

Cable structure shielded cable vs unshielded cable

What Is the Function of a Shielded Cable?

F/UTP Shielded Cable

F/UTP cable shielding structure: Four pairs of wires in the data cable have a layer of aluminum foil shielded, this layer of shielding (also called screening) protects against EMI/FRI and crosstalk.

S/FTP Shielded Cable

In S/FTP structure, in addition to the braided foil shield, the four twisted pairs have a layer of aluminum foil shield respectively to protect the transmission signal and make sure they do not interfere with each other, making near-end crosstalk attenuation (NEXT) performance dramatically good. Better NEXT performance means higher SNR and better transmission quality and faster system output. S/FTP shielded cables’ excellent NEXT structural performance can not be compared by other cables (such as non-shielded U/UTP). Therefore, ISO11801 on the Cat7 cable (600MHz) and Cat7a  (1000MHz) only provides the S/FTP cable structure, U/UTP cannot meet.

10GBase-T Makes Data Cable Face New Problem: Alien Crosstalk

2006 Copper Gigabit Ethernet applications published the proposed new standard transport protocols 10GBASE-T. Compared to 1000Base-T, its transmission rate increased 10 times. 1000BASE-T copper cabling has requirements for parameters (Attenuation, NEXT, Return Loss, etc.). The bandwidth required to reach 1-100MHz with UTP Cat5e (Class D) cabling system. 10GBASE-T cabling channel requirements of all component parameters have to be up to 500MHz bandwidth, which requires copper to reach at least Cat6a (Class Ea) or higher level.

Along with the development of 10GBASE-T, external noise problems become more evident, resulting in a specification for external noise to be used to assess in the same bundle of cables, the interaction between different cables. This is what we call Alien Crosstalk. Alien Crosstalk will increase with the increase of frequency. Worse, 10GBASE-T confronted with external noise, will not be able to “adaptive” to lower the rate at which the network may be subsequently face paralysis. Therefore, to support 10GBASE-T cabling system application, the ability to resist alien crosstalk is vital.

Since 10GBASE-T high transmission frequencies and complex coding method is very sensitive to the external noise. Shielding system excellent coupling attenuation performance makes it naturally have to resist alien crosstalk. The unshielded system against alien crosstalk is usually only on the performance of 0dB. Shielding system in the design completely satisfies the application of 10G.

The Installation of 10GBase-T: U/UTP VS. FTP 80a

Unshielded System

As far as possible away from power cable during installation. Different applications (1Gb/s and 10Gb/s) in the same pipeline transmission will cause the external crosstalk.

Shielding System 

The advantages of using a shielding system can be technically proven by different complex parameters such as coupling attenuation, shielding efficiency and transfer impedance. But from a user’s point of view, what makes the most sense is the practical advantage of a shielded cable-based cabling solution in the ever-increasing world of high-speed network applications. The advantage of shielded cables over UTP cables is that they are aimed at deepening the effects of EMI caused by the widespread use of electronic devices. Moreover, an increase in the rate of network applications means that the network is more sensitive to EMI.

The Separation Distance Between the Data Cable and Power Cable

EN50174 standard defines the content of four different coupling attenuation value levels of data cable respectively from A (low coupling attenuation, worse) to D (high coupling attenuation, good).

Classification of information technology cables

Screened Unscreened Coaxial/twinaxial Segregation classification
Coupling attenuation at 30 Mhz to 100 Mhz TCL at 30 MHz to 100 MHz Screening attenuation at 30 MHz to 100 MHz
>= 80dB >= 70 -10xlg(f) dB >= 85dB d
>= 55dB >= 60 -10xlg(f) dB >= 55 dB c
>= 40 dB >= 50 -10xlg(f)dB >= 40 dB b
< 40 dB <50 -10xlg(f) dB < 40 dB a

Installers need to know which cable separated levels to determine the choice of the data requirements of the standard cable with power cable between the minimum separation distance. Data cable coupling attenuation higher the value and power cables minimum separation distance between the smaller. Please refer to the following three examples, screenshots from Nexans Toolkit.

U/UTP

Example 1: U/UTP (Class B – Coupling Attenuation >/= 40dB) -> 225mm

F/UTP

Example 2: F/UTP (Class C – Coupling Attenuation >/= 55dB)-> 114mm

S/FTP

Example 3: S/FTP (Class D – Coupling Attenuation >/= 80dB)-> 24mm

Relative to the shielded cable, the unshielded (U/UTP) separation distance between cable and power cable is further. In the implementation of the project, if need the data cable and power cable isolation far distance, we need a bigger size pipe/bridge, or even additional bridge, doing this will no doubt have higher cost, sometimes limited to the bridge installation space. To make matters worse, these additional requirements are often neglected or ignored, making network system the key point of interference.

Grounding

For shielded, unshielded systems and fiber optic cable, they all need to implement protective grounding. Because of the need to consider personal and equipment safety, therefore no matter adopt what kind of cabling system, the metal part of the system must be grounded. For the shielding system, also need to implement the functional ground.

Conclusion

Shielding system relative to the unshielded system has been greatly improved EMC performance. For Gigabit Ethernet applications, shielding against external interference effects is essential, and shielded cabling system had to meet the standards in the design of anti-alien crosstalk (A-XT) requirements, can effectively prevent the cable from the adjacent between the external crosstalk. Shielded cabling system with shielded cable adopted, properly grounded at both ends of the case, is superior to unshielded system in resisting external interference.

Related Articles:
Ethernet Cable Types – Cat5e, Cat6, Cat6a, and Cat7
Difference of Straight Through and Crossover Cable
Patch Cable vs.Crossover Cable: What Is the Difference?
Quick View of Ethernet Cables Cat5, Cat5e And Cat6

Cabling Design and Thinking

Introduction

As all we known: cabling of building local area network (LAN) at the end of the 100m cabling, community area last 2km integrated network cabling computer data center room, such as several internal cabling. Cabling in different locations, in accordance with their purpose and corresponding transmission index calculating the length of the cabling to allow laying. No matter what position cabling used, all belong to the city telecommunications network extension and an important part. Only in depth understanding of urban development trends of telecommunication networks, in order to accurately grasp how to design integrated cabling; also only be taken with the city development strategy telecommunication network synchronization and with suitable, cabling can really play the overall effectiveness of the network and obtain win-win enconomic effects. Here only to the development of telecommunication networks, cabling should be synchronized with the development, as well as the latest developments in cabling issues such as study and discussion.

The development trend of telecommunication network

In traditional telecommunications networks based voice communication, a small amount of digital data network (DDN), Frame Relay (FR) point to point, such as low rate of data communication, a voice path begins only within the bandwidth of 64kbps. In the early 1990s, China’s foreign experience with the introduction of Ethernet Cable Wiring and network communication technology, and accordingly developed our standards, and actively promote the application of the telecommunications network to get great propress. In just 10 years time, network communication technology from 10 megabytes, 100 megabytes, Gigabit to 10 Gigabit-class development, or even 10 Gigabit-class network will soon put into large-scale application.

The development of the telecommunication network is omni-directional, methods of communication include: wired, wireless, satellite, etc.; Communication contents include: telephone, television, data, etc..

a. The rapid development of the passive optical network (PON)

Currently, the passive optical network (PON) is rapidly developing country, for example: EPON (Ethernet Passive Optical Network), GPON (Gigabit Passive Optical Network), GEPON (Gigabit Ethernet Passive Optical Network), APON (ATM Passive Optical Network), BPON (Broadband Passive Optical Network) and other network applications, structured cabling will have a direct impact. Now illustrate EPON/GPON networking mode:

EPON/GPON is mainly composed of OLT (Optical Line Terminal), ODN (Optical Distribution Network) and ONU (Optical Network Unit) and other components. EPON / GPON networking shown in Figure 1:

 EPON / GPON networking

The network characteristics of EPON/GPON:

* On the OLT and ONU in addition to optical interface, combined with GE (Gigabit Ethernet), FE (Fiber optic Ethernet), RF (Radio Frequency), E1 (2.048Mbps) interfaces, can be applied to various network applications.

* EPON can provide uplink and downlink symmetrical rate 1.25Gbps.

* GPON can provides uplink 155Mbps, 622Mbps, 1.24Gbps or 2.48Gbps; Downlink 1.24Gbps or 2.48Gbps.

* Public IP network signal WDM CWDM DWDM, the uplink of 1490nm and downlink of 1310nm signal through the central office OLT integrated transceivers were injected into the same optical fiber, through the optical distribution network ODN spending 32.64 points or 128 optical link to the corresponding ONU. If necessary, can also be injected CATV signals using the third wavelength of 1550nm central office OLT transceiver integrated in the corresponding ONU than the client integrated transceivers separated by the RF interface of the user received a cable distribution network.

* EPON/GPON network support tree, star, bus, hybird and redundant topology etc..

* EPON is based on the standard Ethernet technology and IEEEP802.3ah, in the case of transport 1.25Gbps data stream, the optical line terminal (OLT) and the optical network terminal (ONU) between a transmission distance up to about 20km.

* GPON is based on the ITU-T standard G984.1-G984.5 version, is preferred in Europe and North America, FTTH technology, is being used worldwide. GPON generic framing protocol that provides a multi-protocol transmission efficiency can provide an open interface, with 2.48Gbps rate symmetric and asymmetric transmission capacity, OLT/ONU transmission distance up between 37km.

b. FTTH or FTTB/N

As EPON/GPON technology matures, the price of Optical Fiber Cable are more and more cheap. Fiber optic cable extends to the floor, community nodes, and even to the family increasingly likely. As telecom companies certainly want to consider the relationship between input and output in the short term cost recovery and profit is the ultimate goal.

The advantages of FTTH solutions:

1. Provide greater bandwidth capacity, suitable for high speed network applications.

2. Is not affected by the outside electromagnetic interference, anti-interference performance is good, high quality communications.

3. Silica fiber material production inexhaustible.

4. The price of fiber optic cable has lower than copper (but photoelectric conversion equipment price is still relatively high, therefore, the overall cost is higher).

The disadvantages of FTTH solutions:

1. Same scale projects, the initial investment is higher.

2. New fiber optic cable and more, longer construction period (relative to the FTTB/N solution).

3. Slow return on investment.

Help You To Buy Fiber Optic Modems From Fiberstore

The rapid development of the Internet age, fiber optic modem is good for you, especially when you’re dealing with large amounts of data.Fiber optic modems,someone also called fibre optic modems.This type of modem, you can quickly and efficiently transfer data.Under normal circumstances, the fiber optics modem provides two modes of multi-mode and single-mode.

Fiber optics modem receives the incoming optical signal by optical fiber cable, and translate them back to the electronic form of full-duplex transmission. They are available in single channel and multi-channel configuration.FiberStore fiber optic modems are available in various form factors depending upon the protocol selected, such as RS-232/RS-485/RS-422 Fiber Optic Modem. Our FOM has a higher bandwidth and greater electromagnetic immunity than wire-based modems. Together with multimode or single-mode fiber, the fiber optic modem allows data to be transmitted and convert electrical signals to light. It provides transmission distance up to 2km (multimode) or up to 20km/40km/60km (single-mode).

The FOM allows users to replace existing coaxial cable communication links with lightweight fiber optic cable. The advantages of using fiber optic cables are as follow:

1) Lighter weight and smaller size for much quicker deployment
2) Higher bandwidth for increased throughput
3) Lower loss for long distance repeater less communication up to 16 kilometers
4) Better quality-safe from electromagnetic interference from any source
5) More secure – no electromagnetic signature
6) Less expensive

Note:Fiber optic modem is the new kid on the block as it joins cable, DSL, satellite and dialup in the battle for Internet access superiority. Although it’s not available in all areas, its higher speeds and reliability make it a major contender. Internet or network connections that require a fiber optic modem are more commonly used commercially rather than residentially. Not all Internet service providers offer a fiber optic option, so the first step to choosing a fiber optic modem is to make sure you actually need one. Most home Internet connections use copper wires and coaxial cables, though these may connect to fiber optic wiring at the curb. Check with your Internet provider to see what types of modems can work with your particular service.

20KM Fiber Modem RS485/RS422/RS232 to Fiber Converter Single-mode Double-fiber 1310nm SC/ST/FC