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Many optic modules of the form factor have developed with the advancement of fresh hi- tech and high-level speed interlinks in the last few years and in this group, QSFP56 as a collaborator of the QSFP class is a clarification for the implementations of 200G. The questions like what are the contradictions between QSFP56 with further QSFP class form factors? And is there any similarity between QSFP56 and QSFP56-DD? With the condition that you are amazed regarding these questions, you have to read this article.
QSFP56-AN ADDITIONAL FORM FACTOR TO QSFP FAMILY:
At first take notice of the QSFP form factor in order to elucidate everything about QSFP56. Quad Small Form Factor Pluggable (QSFP) is a developed form of SFP which was initially planned to take the place of single mode SFPs with high-level compactness optic modules. In view of this fact that it indicates four tracks for above 4 wavelengths, it comes up with high-level bandwidth dimensions as compared to SFP optical modules.
40G QSFP+ came to light advanced by the support of Quad Small Form Factor Pluggable and after that for high-level compactness implementations, 100G QSFP28 arose. The vendors are in a hurry to attain high-level speed, usual accessibility with the progress of business in data centers and developed implementations of networks. 400G QSFP56-DD and 200G QSFP56 are some more inclusions to QSFP class form factor.
QSFP50G as an advancement of the preceding 100G QSFP28 and 40G QSFP is particularly created for 200G Ethernet. Quad 56 Small Form Factor Pluggable signifies 4x50 up to 56 Gigabits in the form factor of QSFP. For the purpose of clarity, it can also be mentioned as 200G QSFP. In expression of dimensions and form factor, QSFP56 modules are alike QSFPs. QSFP56 optical modules categorized by range, can be ranked into QSFP56 CR, DR, FR, CR, which above an MMF or SMF, allows various connection ranges.
In order to understand a 200G connection, usually two QSFP56 optical modules can be utilized with a single mode fiber or multimode fiber. To understand a 200G connection, QSFP56 DAC/AOC is also a manner by making a connection of Quad 56 Small Form factor pluggable (QSFP) ports on two appliances in a clarified connecting procedure. For connecting 200G Quad 56 Small Form factor pluggable (QSFP) ports with further speeds, 200G 56 Quad Small Form factor pluggable up to 2x100G Quad 28 Small Form factor pluggable breakout wires extending to 4x50G 56 Small Form factor breakout wires continue to exist in order to attain 4x5G or 2x100G links.
DIFFERENCES BETWEEN QSFP28, QSFP56 AND QSFP+:
QSFP+, QSFP28 and QSFP56 as observed by their trade names, are same in the way that they possess the similar form factor like their postfix presentations, and they share the similar dimensions like with each one of them. Nevertheless, they have different network potentiality and their data center is also different. Here is a graph categorizing the main specifications of Quad 28 Small Form factor pluggable (QSFP), Quad 56 Small Form factor pluggable (QSFP) and QSFP+ as well.
After having a look at the table, it can be observed that the form factor of QSFP56 as compared to QSFP28 and QSFP+ shows a high-level connectivity speed like 4x50G modes are supported by 200G Quad Small Form factor pluggable. Whereas QSFP+ is a developed form of QSFP to provide support to 4x10G modes handling 10G fiber mode, 10G Ethernet and QDR Infinity Band (IB) as well. In order to extend bandwidth, it presented the idea of multiple four tracks, having the ability to control 40Gbps capacity channels in the direction of 10GB and NRZ per track. QSFP28 holds 4-track optical communicator and 4-track optical recipient as QSFP+ works out and it also provides support to 4x25G modes.
The remarkable modification out of Quad 28 Small Form factor pluggable and QSFP+ towards Quad 56 Small Form factor is that a variation was formed by Quad 56 Small Form factor pluggable (QSFP) from NRZ encrypting to PAM4 encrypting.
The inflection is magnified towards 50G per mode, although Quad 56 Small Form factor pluggable (QSFP) motionlessly makes use of 4 tracks like Quad 28 Small Form factor (QSFP) does and this magnification allows further data on prevailing fiber, consequently more appropriate for connectivity of the data center of hyper-scale.
CHANGEOVER FROM QSFP56 TO QSFP56-DD:
While data centers are experiencing fast development, the emerging requirement for data capacity is impelling network fundamentals to provide support to high-level compactness and high-level bandwidth. From Quad 56 Small Form Factor pluggable (QSFP) to QSFP56-DD is the most recent succession of optic modules. DD stands for double density, showing ranging 400G by the way of magnifying data tracks from 4 tracks to 8 tracks of QSFP56.
The range of QSFP56-DD is the same as Quad 56 Small Form factor pluggable (QSFP), although QSFP56-DD possesses double compactness. 400G QSFP56-DD port is rearward well-suited to QSFP optical transceiver, QSFP56 can operate upon the port QSFP56-DD as much as the switch provides support. At the time a QSFP56 optical module is used in a port QSFP56-DD, rather than for a data rate of 400G, this port will be customized for a range of 200G.
At present time the QSFP56-DD factor is acknowledged as a 400G factor by the industry of 400G and it acquires the most interest. Despite the fact that for the data center of the upcoming generation, today 400G Ethernet is considered a long term solution, a necessity for 200G QSFP56 continues to exist for a few corporations implementing 200G Ethernet.
