Hello,
Today, I would like to share with you the various optical modules SFP+, SFP, XFP, QSFP, QSFP+ and X2.
SFP transceivers are available in a number of different transmit and receive types, and users can select the appropriate transceiver for each link to provide the "optical performance" that can be achieved based on the type of fiber available, such as multimode or singlemode.
The available optical SFP modules are generally divided into the following categories:
MMF (SX) at 850nm wavelength/550m distance,
SMF (LX) at 1310nm wavelength/10km distance,
XD at 1550nm wavelength/40km distance,
80km distance ZX, EX or EZX for 120km range, and DWDM.
SFP transceivers also provide a copper interface, enabling host devices designed primarily for fiber-optic communications to communicate over UTP network cables. There are also wavelength division multiplexing (CWDM) and single fiber "bidirectional" (1310/1490 nm wavelength upstream/downstream) SFPs. Commercial SFP transceivers are capable of delivering rates up to 4.25 Gbps. Several packages of 10 Gbps transceivers are XFP, as well as a new variant "SFP+" that is basically identical to the SFP package.
GBIC (abbreviation for Gigabit Interface Converter) is an interface device that converts gigabit electrical signals into optical signals. The GBIC is designed to be hot-swappable. GBIC is an interchangeable product that complies with international standards. Gigabit switches designed with GBIC interface occupy a large market share in the market due to their flexible interchangeability. SFP (Small Form-factor Pluggable) can be simply understood as an upgraded version of GBIC.
SFP supports SONET, Gigabit Ethernet, Fibre Channel, and some other communication standards. This standard extends to SFP+, which supports 10.0 Gbit/s transfer rates, including 8 gigabit Fibre Channel and 10GbE. Introduced SFP+ module versions of fiber and copper core versions, compared to the XENPAK, X2 or XFP versions of the modules, SFP+ modules leave part of the circuit implemented on the motherboard instead of in the module
The 10G module has undergone development from 300Pin, XENPAK, X2, and XFP, and finally realized the transmission of 10G signals with the same size as SFP, which is SFP+. With its advantages of miniaturization and low cost, SFP meets the high-density optical module requirements of equipment. From the introduction of the standard in 2002, it has replaced XFP to become the mainstream of the 10G market in 2010.
Advantages of SFP+ optical modules:
1. SFP+ has a more compact form factor than X2 and XFP packages (same size as SFP);
2. It can be directly connected to XFP, X2, XENPAK of the same type;
3. Cost is higher than XFP, X2, XENPAK Product is low.
The difference between SFP+ and SFP:
1. SFP and SFP+ have the same dimensions;
2. SFP protocol specification: IEEE802.3, SFF-8472;
The difference between SFP+ and XFP:
1. Both SFP+ and XFP are 10G fiber optic modules, and can interoperate with other types of 10G modules;
2. SFP+ is smaller in size than XFP;
3. Because of its smaller size, SFP+ modulates signal functions, Serial/Deserializer, MAC, Clock and Data Recovery (CDR), and Electronic Dispersion Compensation (EDC) functions are moved from the module to the motherboard card;
4. XFP compliant protocol: XFP MSA protocol;
5. SFP+ compliant protocol : IEEE 802.3ae, SFF-8431, SFF-8432;
6. SFP+ is a more mainstream design.
7. SFP+ protocol specification: IEEE 802.3ae, SFF-8431, SFF-8432.
QSFP: Quad Small Form-factor Pluggable
Quad Channel SPF Interface (QSFP), QSFP was born to meet the market demand for higher density high-speed pluggable solutions.
This 4-channel pluggable interface has a transfer rate of 40Gbps. Many mature key technologies in XFP are applied to this design.
QSFP can be used as a fiber optic solution and has better speed and density than 4-lane CX4 interface.
Since it can support four channels of data transmission at a speed of 10Gbps per channel under the same port volume of XFP, the density of QSFP can reach 4 times that of XFP products and 3 times that of SFP+ products. The QSFP interface with 4 lanes and higher density than CX4 has been adopted by the InfiniBand standard.
QSFP+: Quad Small Form-factor Pluggable Plus
(QSFP+) solution is designed for high density applications. System components include electromagnetic interference (EMI) shielding, active optical cable (AOC), passive copper cable assemblies, active copper cable assemblies, optical MTP cable assemblies, optical loopbacks, host connectors, connectors and cage stack-up integration.
The documentation for SFF-8436 specifies a radio transceiver mechanical form factor with latching mechanism, host-board electrical-edge connector and interface. The hot-swappable transceiver integrates 4 transmit and 4 receive channels. Molex's QSFP+ transceivers can replace 4 standard SFP+ transceivers. The result is greater port density and overall system cost savings over traditional SFP+ offerings. QSFP+ cable assemblies are designed to provide stacked connector configurations in extremely high density requirements. This system will support 10G Ethernet, Fibre Channel, InfiniBand, SAS and SONET/SDH standards using different data rate options.
Includes InfiniBand Separate Data Rate (SDR), Double Data Rate (DDR) and Quad Data Rate (Reporting), Ethernet System (10 ~ 40 Gbps), Fibre Channel (8, 10 Gbps), SAS (12 Gbps) s).
X2 optical module
X2 optical module is the main type of package module in 10G optical module, developed from XENPAK. It is a hot-swappable input/output device, mainly used for Ethernet X2 port switches or routers and network connection ports.
Historical development of X2 optical module:
X2 evolved from the XENPAK standard, and its internal functional modules are basically the same as XENPAK and the application on the circuit board. In terms of realizing the function of the 10G Ethernet optical interface, only one module is used. Can. Because the XENPAK optical module needs to be slotted on the circuit board with complicated operation when it is installed on the circuit board, and high-density applications cannot be realized. The improved X2 optical module (its volume is only about half the size of XENPAK) can be directly placed on the circuit board, so it is suitable for high-density rack systems and PCI network card applications.
X2 optical module features and applications:
X2 also uses XENPAK electrical interface, but there are a few exceptions. X2 provides a 4-bit port address space, one less than XENPAK. X2 also reduces the number of power pins and makes the backplane and electrical ground common. X2 retains 4 vendor-specific pins of XENPAK. In terms of optical technology, the X2 supports 10GbE (Ethernet), OC192 Synchronous Optical Network, 10GFC (Fibre Channel) and other standards.
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