Comparison Between QSFP-DD and QSFP

The rapid development in optical communication industry is driving massive demand, for higher bandwidth and faster data rate, from 10G to 40G and 100G, will this keep going on? The answer is definitely “Yes”. In recent years, migration from 10G to 40G or 25G to 100G has been a hot spot among data center managers. While recently, QSFP-DD solutions and components are coming. We know that the QSFP-DD is similar to the current QSFP, but what’s the difference between them? In this article, the comparison between QSFP-DD and QSFP will be explored.


1.What are QSFP-DD and QSFP?
QSFP-DD module: QSFP-DD refers to Quad Small Form Factor Pluggable Double Density. It uses eight 25G lanes via NRZ modulation or eight 50G lanes via PAM4 modulation, which can support optical link of 200 Gbps or 400 Gbps aggregate. In addition, QSFP-DD module can enable up to 14.4 Tbps aggregate bandwidth in a single switch slot. As it is backwards compatible with QSFP modules, QSFP-DD provides flexibility for end users and system designers.


The Quad Small Form-factor Pluggable (QSFP) is a compact, hot-pluggable transceiver used for data communications applications. The form factor and electrical interface are specified by a multi-source agreement (MSA) under the auspices of the Small Form Factor Committee. It interfaces networking hardware (such as servers and switches) to a fiber optic cable or active or passive electrical copper connection. It is an industry format jointly developed and supported by many network component vendors, allowing data rates from 4x1 Gb/s for QSFP and 4x10 Gbit/s for QSFP+ and to the highest rate of 4x28 Gbit/s known as QSFP28 used for 100 Gbit/s links.

2.QSFP-DD vs QSFP
The QSFP-DD is similar to the current QSFP. But there are many differences between the current QSFP.



From the above picture, we can see that QSFP-DD is smaller than QSFP in packaging. The reason why the new transceiver is called “double density” is related to the current 100G QSFP28 transceivers. The “double density” means the doubling of the number of high-speed electrical interfaces that the module supports when comparing to regular QSFP28 module. In terms of transmission data rate, the QSFP-DD is capable of operating 25 Gb/s NRZ modulation or 50 Gb/s PAM4 modulation over 16 pairs of twinaxial conductors or optical fibers to support 200 Gb/s or 400 Gb/s aggregate bandwidth while QSFP supports data rates from 4x1 Gb/s, 4x10 Gbit/s and to the highest rate of 4x28 Gbit/s known as QSFP28 used for 100 Gbit/s links. Systems designed with QSFP-DD connectors will be backwards compatible to support interoperability with existing QSFP modules, however, the QSFP-DD connector will only support 200 Gb/s or 400 Gb/s aggregate speeds when mated with QSFP-DD modules.

3. 200G QSFP-DD

The road map of QSFP-DD is drawing our attention. It is predicted that QSFP-DD will become a useful family of modules for the industry with application at greater than 400G. As a global optical interconnection innovator, Gigalight has released QSFP-DD 2x100GBASE-SR4 in the middle of the year.It integrates eight data lanes in each direction with 8x25.78125Gbps bandwidth. Each lane can operate at 25.78125Gbps up to 70 m using OM3 fiber or 100 m using OM4 fiber.This module incorporates Gigalight Technologies proven circuit and VCSEL technology to provide reliable long life, high performance, and consistent service.


Conclusion:
At present, QSFP-DD is superior than QSFP no matter in appearance or product performance. With the development of big data and clouding computing, more and more higher performance products will come out in the near future. No matter QSFP-DD or QSFP, you can always choose the one that best suits your network demands.

Difference Between GBIC and SFP & Application

GBIC (Gigabit Interface Converter) is a hot-swappable Gigabit Interface optical module with SC connector. A gigabit interface converter (GBIC) is a standard for transceivers, commonly used with Gigabit Ethernet and fiber channel. A variation of the GBIC called the small form-factor pluggable transceiver (SFP),also known as mini-GBIC, has the same functionality but in a smaller form factor. When it’s best to use GBIC and When to use SFP? What’s the specific difference between GBIC and SFP? This article will talk about it.


GBIC vs SFP

1.GBIC is larger than SFP: “GBIC” stands for “Gigabit Interface Converter” and was quite popular in the 1990s. It served as a standard way of connecting to different media like copper and fiber optic cables. In contrast, “SFP” stands for “Small Form-Factor Pluggable,” which also serves the very same purpose as GBIC. The main difference between GBIC and SFP is their size. SFP is considerably smaller than GBIC. It is half the volume of GBIC and can be configured double number of ports on the same panel. Other basic functions is the almost the same with the GBIC.

2.SFP is in prominent use while GBIC is already obsolete: The difference in size is very desirable for many people, especially for those who deal with lots of them, because it will take up a lot less space. Considering that space in a server location is quite limited, using SFP lets you put more within one rack unit than if you used GBIC. Because of this single difference, SFP rapidly gained popularity with administrators who want to maximize their space. As SFP became more popular, GBIC also fell out of favor. Nowadays, GBIC is considered to be obsolete, and you would be hard pressed to find vendors that still carry equipment that is compatible with GBIC. SFP is still widely being used nowadays but is also under pressure from newer standards like SFP+.

3.GBIC and SFP are equal in performance: Although they are different in some aspects , the GBIC and SFP are equal in performance. Both of them are used for Hot swappable to maximize uptime and simplify serviceability, Flexibility of media and interface choice on a port-by-port basis, so you can “pay as you populate” ,Robust design for enhanced reliability and supports digital optical monitoring (DOM) capability.



Some Modules of GBIC and SFP

1.1G GBIC
Gigalight GIBC (Gigabit Interface Converter) is a hot-swappable input/output device that plugs into a Gigabit Ethernet port or slot, linking the port with the network. It consists of two sections: The transmitter section incorporates a DFB laser, and the receiver section consists of a PIN photodiode integrated with a trans-impedance preamplifier (TIA). All odules satisfy class I laser safety requirements.


2.BIDI SFP
Gigalight BIDI SFP is for Single-Fiber Bidirectional Applications. Up to 2.67Gb/s, Distance up to 120 km. The transceiver consists of three sections: a DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.

3.CWDM SFP
Gigalight CWDM SFP is compliant with ITU-T G.694.2. 18-Wavelength is avaiable. Up to 4Gb/s, Distance up to 80 km. The transceiver consists of three sections: a DFB laser transmitter, a APD photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.


In summary, GBIC is larger than SFP. SFP is in prominent use while GBIC is already obsolete. GBIC and SFP are equal in performance.

Three Main Types of SFP Transceiver

SFP stands for “Three Main Types of SFP Transceiver” and transceiver means a device that can both transmit and receive data. This article “Three Aspects You Should Know About SFP Transceiver” is intended to describe all about SFP transceivers in detail that could help network professionals understand about SFP optics and its types.



What Is SFP Transceiver

SFP is a new generation of fiber optic module transceivers, known for its compact size, flexibility and high level of performance. It is specified by MSA (Multisource Agreement) and it is available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type. SFP transceiver is generally with two ports, one is TX port which is used to transmit the signal, and the other one is RX port which is used to receive signals.




Features of SFP Transceiver

SFP transceivers are used in network switches, firewalls, routers, and network interface cards. SFPs are also used in storage interface cards or fiber channel storage switches, supporting different speeds such as 2Gb, 4Gb, and 8Gb. SFP transceivers comply with the Multi Source Agreement between different manufacturers. Optical SFP transceivers come with digital monitoring features with the help of which one can monitor the performance of SFP in real time. This feature can be used to monitor SFP’s performance parameters like working temperature and wavelength, supply voltage, optical input and output etc. These transceivers have a PCB in them which connects to an electrical connector designed for SFP. SFP transceiver also has a 256 byte EEPROM memory. SFP transceivers are housed in a metal enclosure and their power dissipation is low. They operate over a wide temperature range and support a large number of different types of cable. An improved version of SFP standard called SFP+ can support transmission rates up to 10Gbps.



Types of SFP Transceiver

●CWDM SFP
The CWDM SFP (small form-factor pluggable) transceiver is really a compact optical transceiver used in optical communications for both telecommunication and data communications applications on the wavelength. CWDM SFP are used to link the ports to the fiber optic network, typical CWDM SFP like Cisco’s could support both Gigabit Ethernet and Fiber Channel. CWDM SFP transceiver modules make use of the SFP interface for connecting the equipment and use dual LC PC fiber connector interface for connecting the optical network. Gigalight CWDM SFP transceivers can be found with a variety of different transmitter and receiver types, allowing users to decide on the appropriate transceiver for each link to provide the required optical reach over the available optical fiber.


●DWDM SFP
The Dense Wavelength-Division Multiplexing (DWDM) transceivers offer DWDM transport with dramatically lower power and cost in a standard pluggable SFP package. Gigalight DWDM SFP is available in all 100 GHz C/L-band wavelengths on the DWDM ITU grid. As multirate interfaces they support any protocol from 100 Mbps to 4.25 Gbps. The modules meet the requirements of the IEEE802.3 Gigabit Ethernet standard and ANSI Fiber Channel specifications, they are suitable for interconnections in Gigabit Ethernet and Fiber Channel environments. The DWDM SFP is designed to accept DWDM SONET/SDH (with or without FEC) for 200km links and Ethernet/Fiber Channel protocol traffic for 80km links.


●10G SFP
The 10G SFP Transceiver Modules refers to 10G SFP Plus Transceivers,someone know that the sfp+ is an enhanced version of the SFP that supports data rates up to 10 Gbit/s. Several standards for 10G SFP has been released, 10GBase-SR is for OM3 multimode optical fiber, relevant SFP plus working distance 300 meters max, 10GBase-LR is for single mode optical fiber, relevant SFP plus working distance 10km, 10GBase-LRM is for FDDI multimode fiber, the SFP plus working distance 220 meters.


Conclusion:
If you want to know more types of SFP Transceivers, pls visit infiberone.com, We will continue to update fiber optic transceiver information. Our optical transceivers are backed by a lifetime warranty, and you can buy with confidence. We also can customize optical transceivers to fit your specific requirements.

How much do you know about “Ethernet”

In today's business world, reliable and efficient access to information has become an important asset in the quest to achieve a competitive advantage. File cabinets and mountains of papers have given way to computers that store and manage information electronically. Coworkers thousands of miles apart can share information instantaneously, just as hundreds of workers in a single location can simultaneously review research data maintained online. In this background, Ethernet is born as a family of computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). In this article, we will take a very close look at Ethernet, so you can understand Ethernet in full view.


What Is Ethernet?

Ethernet is a local area technology connected devices in close proximity, and it is the name of the most commonly used LAN today. A LAN (Local Area Network) is a network of computer that covers a small area like a room, an office, a building or a campus. It is used in contrast with WAN (wide area network) which spans for much larger geographical areas. Ethernet is a network protocol that controls how data is transmitted over a LAN. Technically it is referred to as the IEEE 802.3 protocol.

There are different types of Ethernet, including Standard Etherenet (10Mbit/s), Fast Ethernet(100Mbit/s) and 10G(10Gbit/s) Ethernet. In fact, the original Xerox Ethernet operated at 3Mbps. Ethernet became popular as a 10Mbps standard over coaxial or twisted pair cabling. Fast Ethernet improved speeds to 100Mbps over twisted pair or fiber optic cables. Gigabit Ethernet now provides speeds up to 1Gpbs over twister pair or fiber optic cabling.


How Does Ethernet Work?

When a host in Ethernet wants to transmit data, it follows the following steps :

1.Monitor whether there is a signal on the monitor channel. If so, indicating that the channel is busy, continue to listen until the channel is idle.
2.If not , it will transmit data.
3.Continue to monitor when transmitting, perform a back-off algorithm if a conflict is found, wait for a period to re-execute step 1 (when the collision occurs, the computer that is involved in the collision will be sent back to the listening channel state.)
Pay attention: each computer can only send one package at a time, a sequence of congestion to warn all nodes.
4.It is successful if no conflicts found, all computers must wait 9.6 microseconds after the last time they attempt to send data again(running at 10 Mbps).

Ethernet adopts a carrier frame capture multiple access (CSMA / CD) mechanism with collision detection. All nodes in Ethernet can see all the information sent in the network, therefore, we also call Ethernet as a broadcast network.


What Is The Ethernet Current Situation ?

The IEEE is pushing Ethernet to unimaginable speeds, from 3Mbps over shared coax to 40/100Gbps over fiber. With the Ethernet standard completed, the 40G and 100G Ethernet is coming out in the demand of optical network communication development. As we know, 40G Ethernet is mainly used for data center area, and 100G Ethernet for operators. Nowadays, 40G/100G Ethernet technology plays a significant meaning to the design of network infrastructure. What’s more, with the mature of 40G Ethernet technology, it is called as “Road Sign” for Ethernet at present, while 100G is rare in market for its high price. In another hand, they all promote cabling transition from serial to parallel. Take the optical transceiver connector for example, transition from LC connector to MPO connector is the true story. Another influence is fiber density’s increase, 40G Ethernet use 8fibers for transmission while 100G use 24fibers. With the high development of communication network, 200G and 400G are on the way...


Conclusion:

Ethernet has become one of the most popular optical communication networks with the advantage of low price, stable and reliable, high communication rate, rich hardware and software products, wide application, mature technology and so on. In recent years, with the development of network technology, Ethernet enters to the control area and forms a new type Ethernet control network technology. The future industry control system development direction must be through industry Ethernet network to achieve interconnect, and final connect internet. Anyway, let’s look forward to foresight the future of Ethernet.

Why is 4K HDMI2.0 AOC becoming more and more popular ?

With the increasing popularity of 4K TV, HDMI2.0 interface is also becoming more common. 4K Ultra HD video interface usually has two versions: HDMI1.4 and HDMI2.0. HDMI 1.4 standard was released in 2009, and now it supports a lot of equipment, mainly for the applications with 4K × 2K (3840 × 2160p @ 30 frames or 4096 × 2160p @ 24 frames), digital data per channel is 340mbps, so the total bandwidth is 10.2Gbps; HDMI 2.0 standard was released in September 2013, for the applications with 4K Ultra HD image (2160p) which is 60 frames per second, digital data per channel is 600mbps, so the total bandwidth is 18Gbps.


Ordinary HDMI HD copper is limited by the electrical signal attenuation, it is said that the top-quality hdmi cable can be up to 5 meters, and cable is vulnerable to external electromagnetic interference. Compared to traditional copper wires, the Gigalight HDMI AOC active optical fiber data cable is longer, thinner and more flexible with better signal quality and without radiation or electromagnetic interference. Compared to other HDMI fiber optic transmission scheme, Gigalight HDMI2.0 AOC active optical fiber cable is easy to use with good compatibility and without the need for external power supply.

Characteristics of Gigalight 4k HDMI cable:
*Maximum transmission length of 100 meter
*Support 4K @ 60hz ultra high-definition display
*Compatible with HDMI2.0, and also compatible with HDMI1.4 / HDMI1.3
*Plug and play, without the need for driver
*Not need any external power supply
*The optical cable is lighter and thinner, and its weight and volume is reduced by above 70% compared to traditional copper cable
*With excellent characteristic to resist electromagnetic interference


1.HDMI AOC consumer applications
HDMI2.0 HD signal extension application of consumer scene. For example, projector is far away from HDMI2.0 signal source (wifi scheme cannot support HDMI2.0 HD playback bandwidth requirements), and then HDMI2.0 AOC can be used.It is also widely used in large international conference center, home theater, gymnasium, commercial cinema, medical equipment, industrial automation, large ornamental Hall, International Exhibition Hall, Outdoor screen advertising, Airport, Railway display screen and so on.

2.HDMI AOC is applied in KVM extender device, such as a large cafe scene.
The common method of optical fiber extender box in Internet bar is to use HD video HDMI interface, USB2.0 interface and analog audio speaker output of computer host, and conduct hybrid integration and extension for host switching power control signals, to reach the extension of 100 meters and meet the demands of the vast majority of high-end large-scale Internet cafes. HDMI1.4 (2.0) ultra-high definition 4K video interface commonly uses optical fiber cable for extension handling. Gigalight HDMI2.0 active optical cable is a solution with good compatibility, low power consumption and low cost. Using optical fiber to replace copper wire as a high-speed signal transmission medium, compared to traditional copper wire, it can transmit the 4K @ 60HZ ultra-high-definition images to 100 meters without any loss, with excellent characteristic to resist electromagnetic interference, so as to fully meet client demands.


4K and 8K display screen may be extended for 20 meters according to client demands, and then HDMI AOC optical fiber cable should be used.


By the way ,external power supply and setting are unnecessary, you can use it easily with connection only.Pay attention please, there is direction for connectivity .Pls make sure you run the cable in the correct direction the "Display" side to the TV and the "Source" side to the equipment.


Purchasing link:
https://www.amazon.com/dp/B00SKHY9ZW