QT-QSFP28-ZR4: Make 100G Optical Link Go Farther and Steady 

Over 80km Transmission, Relying on Mature Solutions, Not “Black Technology” 

While most people are still discussing 100G SR, LR, ER optical modules, there is a class of less frequently mentioned models — ZR4. –QT-QSFP28-ZR4 is such a “quiet” existence, it is not the kind of new products that are amazing at a glance, but once you use it, you may never want to switch back to another solution. But once you use it, you may never want to switch back to another program.

To put it bluntly, this module solves a problem: 100G to transmit more than 80 kilometers, how are you going to do? Pull two devices in the middle on the relay? High cost and big trouble. With ZR4, a pair of modules, both ends of a plug, the middle of a single-mode fiber, done. This way, has been running in many places for several years, stability can be said to lose short distance module.

Not all 100G is the Same – ZR4 with Quad + DWDM Technology 

From the appearance, this module and other QSFP28 is almost the same, inserted into the switch, router slot is also the same. But its internal structure is not the same.ZR4 module with 4-channel technology, the 100G traffic split into four 25G data channels, and then through the DWDM (Dense Wavelength Division Multiplexing) packaged into a fiber. This is not at all the same way as the SR type of multi-core parallel transmission.

Each channel runs on a different wavelength, the transmitter side of the merger, the receiver side and then split, this approach is complex, but the benefits are obvious: no more 4-core, 8-core fiber optic cable, a single-mode LC-Duplex fiber can run. This is a very friendly thing for users who have already deployed long-distance SMF links.

Affordable “long-distance optical” is not for scientific research, but for running business. 

When many people hear “80km transmission”, all kinds of high-end customized solutions and optical modules with sky-high prices start to appear in their minds. But QT-QSFP28-ZR4 is not to go this way. It is the standard 100GBASE-ZR4, in accordance with the IEEE standard, not a “so-and-so manufacturer’s special supply” of strange goods.

The key point is that it supports FEC (Forward Error Correction), and comes with amplification circuitry, high transmit power and good receive sensitivity. As long as the fiber is not particularly dirty, the interface is not loose, basically do not have to worry about the old problems of BER and packet loss.

In terms of equipment support, as long as your switch or transmission equipment can recognize the QSFP28 interface and support for ZR class modules, basically can be plugged in. Compatibility of this piece, the current look down, the mainstream like Cisco, Juniper, Arista, Huawei are running through.

Heat, Power Consumption is Not A Problem 

In the end, the ZR4 module is doing “kung fu work” – running far, running stable, consume less. QT-QSFP28-ZR4’s typical power consumption is about 6.5W, higher than those of SR, LR, but this power consumption in return for the ZR4 module is higher than those of SR, LR. Higher than SR, LR, but this power consumption in exchange for 80 kilometers of link extension, how to see also worth. As long as the chassis air ducts are normal and the module is not “compressed”, there will be no thermal protection at all.

And these modules support digital diagnostics (DDM), temperature, voltage, transmit and receive power, the background can see the problem at a glance, and do not have to rely on guessing when things go wrong.

Applicable Scene is Actually Quite A Lot, Not Just Operators 

Don’t just think of telecom operators or metropolitan area networks when you say ZR4. Now a lot of large parks, industrial parks, cross-campus university networks, and even banks, hospitals and these scenarios, also began to use ZR4 to play the backbone link. Especially for users who do east and west ends to pull dedicated lines, no matter whether they build their own network or rent a server room line, they can knock down the cost with ZR4.

In short, if you have 100G demand, and to run tens of kilometers, then this kind of module is actually the most stable choice. QT-QSFP28-ZR4 is a typical “do not care how it works, anyway, it can work steadily” on behalf of.

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