Author: Fiber-MART.COM

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Know the Difference between CWDM and DWDM

by http://www.fiber-mart.com

A WDM (Wavelength Division Multiplexing) is a system that uses a multiplexing (at the transmitter) and a demultiplexer (at the receiver) for the completion of the process and transmission of the signals.
The WDM is divided into three types (WDM, CWDM and DWDM) on the basis of wavelength difference among the three. The article discusses the main differences among CWDM and DWDM.
CWDM stands for Coarse Wavelength Division Multiplexing, and DWDM is the acronym for Dense Wavelength Division Multiplexing. Whether DWDM or CWDM, both are the types of WDM mechanism and have an array of differencess.
Let’s get acquainted with the chief difference between CWDM and DWDM:
The Coarse WDM has less than 8 active wavelengths per optical fiber whereas the DWDM has more than 8 active wavelengths per optical fiber.
The CWDM has lower capacity strength and hence is low in costs; conversely the DWDM possesses high capacity –this leads to an augmented price which is worth its qualities.
When it comes to the difference between the distance of the two, the CWDM has short range communication because the wavelength is not amplified, and DWDM has long range communication.
CWDM Mux and Demux systems are developed to be used in multiplexing multiple CWDM channels into one or two fibers.
Another major difference is that DWDM systems are made for longer haul transmittal, by keeping the wavelengths closely packed. Also, a DWDM device can transmit more data over long distances and to a significantly larger run of cable with lesser interference than a comparable CWDM system which has a shorter haul transmittal.
Furthermore, the Dense Wavelength Division Multiplying systems are capable to fit more than forty different data streams in the amount akin to that of fiber used for two data streams in a CWDM system.
Apart from all the difference there is one more and that is wavelength drift is possible in CWDM, but when it comes to the DWDM –precision lasers are needed to keep channels on the target.
Beyond being different from each other –these systems play different roles in the effective transfer of the signals, and thereby both are important enough.

Know All about the DWDM and its Utilization and Significance

by http://www.fiber-mart.com

WDM is the abbreviation for Wavelength Division Multiplexing, it is a popular technology used in currently fiber optic communication systems. By WDM, we can split a number of optical lights in an optic fiber into a number of discrete wavelengths. Each wavelength can be considered to an independent channel running at a special data rate of 5Gbit/s, 10Gbit/s, 40Gbit/s or even 100Gbit/s. If the light in the fiber is split into 16 channels, and each channel running at 40Gbit/s, the total data transmission rate will be 640Gbit/s. In effect, this means maximized use of a single fiber optic to transmit and receive a large number of signals, minimizing costs for telecom companies. WDM technology is also the working principle of optical amplifiers, multiplexers, and demultiplexers. Next, I will give a separate introduction about WDM/CWDM/DWDM technologies.
DWDM and Conventional WDM
DWDM stands for Dense Wavelength Division Multiplexing. It means the divided wavelength channels are very narrow and close to each other. It is widely used for the 1550nm band so as to leverage the capabilities of EDFA (Erbium Doped Fiber Amplifiers), which are effective for wavelengths between approximately 1525-1565 nm (C band), or 1570-1610 nm (L band). Conventional WDM Conventional WDM uses the 3rd transmission window with a wavelength of 1550nm, accommodating up to 8 channels. DWDM basically is the same however along with the higher density channel. An ultra-dense WDM is capable enough to work at the spacing of just 12.5 GHz, allowing some more channels.
CWDM
CWDM refer to Course wavelength division multiplexing, in CWDM technology, it shared the fact that the choice of channel spacing and frequency stability which is the EDFA could not use. There is an increase in channel space; it cannot be used in EDFA. One basic meaning for the CWDM is two (or more) signals are multiplexed onto the single fiber, where one signal was into the 1550 nm band, and then another one into the 1310 nm band. Currently, there is an increase in the channel space. This means the need for less sophisticated and less costly transceivers devices. Working into the similar window of 1550 nm as well as making the utilization of OH-free silica fibers, the maximum efficiencies are gained into the channels 31, 49, 51, 53, 55, 57, 59 and 61 utilizing the wavelengths from 1270 nm through 1610 nm along with the channel spacing of 20 nm. CWDM devices are commonly used in fewer precision optics and lower cost, un-cooled lasers with lower maintenance requirements? Compared with DWDM and Conventional WDM, CWDM is much more cost-effective and less power consumption of laser devices.
Currently, kinds of related CWDM MUX/DEMUX or DWDM MUX/DEMUX or optical amplifiers are available in the market. Networking solutions provider is the right ones to ask for guidance for use of CWDM, DWDM or WDM technology. Choosing the right one means the correct, integrated devices for error-free high-speed data transmission over fiber optic networks. Cost-effective CWDM solutions with optimized performance and built-in expansion capabilities are available from a host of online network solution companies. Choosing the most experienced one to get the reliable CWDM solution is critical.

What is an SFP and How is it Used?

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Mayday, mayday. We have a problem! We have two switches who desperately want to talk to each other but the walls of their switch cabinets are restricting conversation and they are located 7 feet away from each other. Luckily there is a transceiver that can help us out: the small form-factor pluggable.
The small form-factor pluggable (SFP) is a compact, hot-pluggable transceiver used for data communication applications.  These small metal devices plug into a special switch slot and support communication over either fiber optic or copper networking cable.
Types
To select the right transceiver, you will need to base it on the type of cable you are using, copper or fiber.  To communicate over fiber optic cable, make sure you select a transceiver that matches the slot bandwidth and speed of the device you are connecting to (1Gbps or 10Gbps) and your cable’s connector type (LC or SC). To communicate over copper, select a transceiver with an RJ-45 Ethernet port. Some transceivers support specialty applications such as Infiniband (sometimes used in high-speed storage networks). Make sure you understand your application requirements first, then select your transceiver accordingly.
Optical Transceiver options
GBIC- Originally named Gigabit Interconnect. Typically used for the Cisco 2900 & 3900 series switches, 10/100 megabit.
SFP- Originally named Small form factor pluggable. Commonly used for the Cisco Catalyst 3560 & 3760 series switches amongst others. These SFPs will support Gigabit uplink connection
SFP+- Higher throughput with an enhanced version that will give you 10G uplink capability.  Commonly used for 3560x & 3750x series switches amongst others.
Benefits & Why You May Need One
These SFP transceivers are hot-swappable and have the capability to allow modifications which can be added after the initial purchase. These transceivers can also be deployed in “mix-use” environment of single-mode/multi-mode SFPs and a variety of hardware providing a flexible and customizable solution. If you are looking to have your switches communicate at a faster rate, installing an SFP may be useful. If you are looking for a little more speed in your transfer rates, you will need to have a switch or expansion module that supports 10GbE to use a 10GbE SFP+ transceiver, but not all switches/modules support that.
From the looks of it, these SFP’s fits the bill for all of our switches and/or routers to communicate with each other. If you are in the market to buy any type of SFP, check out CablesAndKits as we offer a variety of options from Cisco Original, and compatible options.

SFP+ compatibility issues? Here are 5 troubleshooting tips!

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Have you ever tried to plug an optic SFP+ transceiver into an SFP+ port to discover that the connection didn’t work, i.e. traffic was very slow or there was no data transmission at all? Did you manage to diagnose the problem and find a resolution? There are several possible reasons for failure. We’ve listed the five most common ones.
First of all, let’s briefly recap what SFP and SFP+ stand for. SFPs – short for ‘small form-factor pluggable’ – are compact, hot-pluggable devices that link networking devices, like switches, routers and servers. In this article, we focus on optic transceivers, as they’re called, which deliver 1Gbps of data across single-mode or multi-mode fibers. The SFP+ is an enhanced version of the SFP that supports data rates up to 10 Gbps. Now, the difference between SFP and SFP+ is an important one when troubleshooting: the transceivers are not always interchangeable.
TIP 1: Check whether you’re using SFP or SFP+ transceivers and slots
SFP and SFP+ modules look exactly the same. And as they have the same size, your SFP transceiver will fit seamlessly into an SFP+ switch port and vice versa. However, the connection won’t work as you expect it to. Or, worse even, it won’t work at all. If you plug an SFP device into an SFP+ port, the speed will be locked at 1 Gbps. Plugging an SFP+ module into an SFP port delivers no results at all, as the 10G transceiver can never auto-negotiate to 1Gbps.
TIP 2: Ensure that the SFPs have identical wavelengths at both ends
Data transmission implies that data is sent from one end to another. The SFP+ transceiver on one end converts electrical signals into optical signals . A built-in laser transmits light through the fiber to the other side. Here, an optical diode converts the light back into an electrical signal. To guarantee that the SFP+ at the other end is capable of doing this, the SFPs at both ends should support the same wavelength. An 1310nm transceiver, for example, will not talk to an 850 nm transceiver.
→ Here, too, look at the specs on the sticker of the modules or check out the details on the manufacturer’s website. Don’t look into the laser light ! Use your smartphone camera if you want to verify that light is coming out of the cable.
TIP 3: Use the correct single or multi-mode fiber cable
Still in trouble even though you are sure you did not mix up SFP and SFP+ and are supporting the same wavelengths at both sides? If so, then verify if the optical transceivers on each end use the same fiber type, i.e. for single-mode or multi-mode fiber. And use the corresponding fiber cable.
Single-Mode Fiber (SMF): featuring a narrow core (typically around 9μm), SMF allows only a single mode (or “ray”) of light to propagate. It is mostly used to transmit data over long distances (max 2km – 120km).
Multi-Mode Fiber (MMF): as MMF has a much wider core (typically 50μm or 62.5μm), it allows multiple modes of light to propagate. The common MMFs are used for short distance transmissions (max 100m – 500m)
TIP 4: Are both ports compatible with your SFP+ modules?
Even when using compatible SFP+s at both ends of the right cable, it is key that both of your devices support SFP+. Make sure that the SFP+ ports on your devices are compatible with the SFP+ modules you want to use. Some brands allow you to use only their own modules.
TIP 5: Is your optic cable in good shape?
Fiber optic cables are exceptionally vulnerable. Dust, dirt or tampering might cause physical damage. So, if you’re experiencing problems when connecting devices, check the connector, the module, and the module slot to make sure they’re not damaged.
To avoid physical damage, avoid extreme bends in fiber optic cables when storing them and put dust-caps on your cable ends if you disconnect them.
In summary, make sure that you know what you are doing when plugging in SFP+ modules and fiber optic cables! It may look simple, but transceivers and slots are not always compatible. Always check the specs on the sticker of your transceiver/the slot, or verify the details on the manufacturer’s website. Only when done right, using fiber optic cables that are in good shape, will you be able to transmit data at the desired speed!

Four Commonly Used Fiber Optic Transceivers

by http://www.fiber-mart.com

In last 5 years, the sale of optical transceivers has grown steadily and is expected to grow exponentially in the years to come. Today, there are many types of optical transceiver modules available in the market. They are segregated as per data transmission speed, connections and packing forms. Few most commonly used optical fiber transceivers include GBIC, SFP, SFP+, X2, XFP, Xenpak and others.
GBIC Transceivers
GBIC was the first transceiver form factor standard before the advent of new generation optical transceivers such as SFP and SFP+. Gigabit interface converter (GBIC) transceivers perform the basic function of converting electric current into optical signal, and optical signal into digital signal and are used as an interface in fiber optic and Ethernet systems for high-speed networking. GAOTek, a leading supplier of advanced fiber optic components, offers a large selection of single-mode/multimode bi-directional (BIDI) and Coarse Wavelength Division Multiplexing (CWDM) GBIC transceivers for you to choose from for sale to the United States, Canada and Globally.
GAOTek GBIC Transceivers are easy to use, compact and hot-swappable and can function across a span of different transmission distances. Designed for tough environments, our GBIC Transceivers offer speed and flexibility across a wide range of switches and networking hardware. GAOTek GBIC Transceivers comply with the SFF 8472 standards and offer a versatile, convenient and cost-effective solution for gigabit Ethernet and fibre channel applications.
GBIC transceivers are widely used in gigabit Ethernet and fibre channel applications. Key specific applications include: Switch to switch interface, Gigabit Ethernet, Switched backplane applications, Router/Server interface and other optical links
SFP Transceivers
Small Form-Factor Pluggable (SFP) Transceivers are compact hot pluggable devices which can be used to provide an interface between communication devices. SFP transceiver is gaining lot of importance these days due to its various advantages. It not only supports SONET / SDH, Gigabit Ethernet, Fibre Channel and other communications standards but also it has been introduced in the market as a better and more advanced alternative replacement to GBIC transceivers and is also called as mini GBIC because its function is similar to the GBIC transceiver, but its dimensions are much smaller than GBIC.
SFP transceivers find abundant application in telecommunication and data communication. They provide tremendous flexibility to network devices, with their ability to provide connection to different types of fiber. A few key applications include switch to switch interface, fast Ethernet, switch backplane applications, router/server interface and other optical links.
GAOTek offers a broad range of SFP Transceivers such as SFP BIDI (bi-directional), SFP Coarse Wavelength Division Multiplexing (CWDM) BIDI, SFP CWDM, and SFP GE-FX & (DWDM Dense Wavelength Division Multiplexing) Transceivers for sale to the United States, Canada and Globally. These devices offer a way to connect a single network device to a wide variety of fiber cables across varied transmission distances and types.
GAOTek SFP Transceivers support single-mode as well multimode fibers and can be inserted or removed during operation. Our transceivers can be used in SONET/SDH networks, Fiber Channel and Gigabit Ethernet. Moreover, these transceivers require less fiber cable and comply with SFF 8472 and RoHS standards.
SFP+ Transceivers
The SFP+ (enhanced small form-factor pluggable) transceivers are upgraded version of SFP transceivers which is more compact in size than SFP module. It supports 8 Gbit/s Fibre Channel, 10 Gigabit Ethernet and optical transport network standard OTU2. The SFP+ and SFP28 transceivers are expected to grow at the highest rate due to applicability in increasing the versatility of the network used for many applications such as data centers, cloud computing, and others.
GAOTek offers a wide range of SFP+ Transceivers such as SFP+ BIDI (bi-directional), SFP+ Coarse Wavelength Division Multiplexing (CWDM), SFP+ DWDM (Dense Wavelength Division Multiplexing), and SFP+ Tunable Transceivers. These hot pluggable SFP+ Transceivers make maintenance of fiber networks extremely convenient allowing service providers to scale up their ethernet service.
fiber-mart.com SFP+ Transceivers are designed to meet specific networking protocols and media requirements and provide accurate digital diagnostic functions. These transceivers are hot swappable, i.e., they can be removed and replaced during operations without turning off the system for sale to the United States, Canada and Globally. GAOTek SFP+ Transceivers support high speed serial link at defined signaling rates for different applications. They comply with 10 Gigabit Enhanced Small Form-Factor Pluggable (SFP+) MSA SFF-8431, SFF-8432, SFF-8690 and SFF-8472.
XFP Transceivers
XFP (10 Gigabit Small Form-Factor Pluggable) transceivers are hot pluggable protocol independent modules which allow a single network device to connect to a wide variety of fiber cables. GAOTek offers a wide selection of high end XFP Transceivers that can be used with single-mode fiber as well as multi-mode fiber for sale to the United States, Canada and Globally. GAOTek XFP Transceivers fall into following categories: XFP BIDI (bi-directional), XFP Coarse Wavelength Division Multiplexing (CWDM), XFP DWDM (Dense Wavelength Division Multiplexing), and XFP Tunable Transceivers. XFP transceivers can reach distances of up to 80 km SMF. They are commonly used for Ethernet, Fiber Channel, SDH/SONET and Infiniband applications. GAOTek XFP Transceivers support 10-Gbps speeds and since they are hot-swappable there is no need to shut down the system during swapping.

19″ Network cabinet type A 12U FM-TA-12U-600-600 Landing Chassis

19″ Network cabinet type A 12U FM-TA-12U-600-600 Landing Chassis

Network cabinets, used to store the 19-inch standard or non-standard equipment such as routers, switches, patch panels, servers, monitors, UPS modules. With good usability and security facilities, easy to operate, installation and maintenance, ensures the safety of the operator.The back of the cabinet mesh door with vent, helps our inter modules still cool. Front door is the glass door or flat door, which can be replaced with: glass column mesh door, double open mesh door, the wave mesh door, side mesh door.
Application
Network cabinet for electronic equipment to work the environment and security
Features
Configuration Instructions:
2Fans, 1 Layper board, 1 Power supply

    • Exquisite design with precise craftsmanship
    • Reliable Structure, the Large Static Loading Capacity:500KG(Optional Castors and Plinth)
    • Welded steel frame for front and back part, can be flat packing, easy to transfer
    • Tempered glass front door with over 180 turning degree; vented front door border
    • Steel rear door with little round lock, optional other lock
    • Removable side panel with latch, easy to install, optional lock
    • Adjustable feet and castors sre available simultaneously
    • Cable entry on the top, adjustable cable entrance at the bottom with panel
    • Advanced handle locks for front door, optional other lock
    • S-shaped mounting profile, free to move forward and back
    • Efficient baying kit of cabinet, Earthing kit
    • Optional plinth to fix cabinet on the floor; under base cable entry
    • Various optional accessories for common using
    • Unassembled packing, about 2/5 of original volume, save container space

 

    • Material

 

    • SPCC quality cold rolled steel
    • Others: SPCC quality cold rolled steel
    • Thickness: Mounting profile: 2.0mm; Mounting angle: 1.5mm; other: 1.2mm

 

    • Standard:

 

    • Comply with ANS/EIA RS-310-D, IEC297-2, DIN41491, PART1, DIN41491, PART 7, ETSI Standard

 

    • Loading Capacity:

 

    • Static loading: 500kg (on the adjustable feet)

 

    • Surface finish:

 

    • Degreaseing, Pickling, Phosphating, Powder Coated

 

    • Size:

 

  • Width:600mm
  • Depth:600mm
  • Height:12U
  • Net Dimension: 600*600*12U（600mm）
  • Packing size:620*620*620 (mm)