How to choose QSFP-SR4-40G module and QSFP-BD-40G module?

- Mar 18, 2021-

How to choose QSFP-SR4-40G optical module and QSFP-BD-40G optical module?

These two kinds of optical modules are most commonly used in 40G network direct connection or 10G-40G network upgrade. The following takes the actual application of 10G-40G network upgrade as an example to describe in detail how we should make different choices in different situations:

1. Structured Wiring

In the data center network layout, the structured cabling system is relatively more flexible and can cover a wider range. Unlike unstructured wiring systems, structured wiring systems need to add some additional accessories. In the 10G-10G structured layout, the most basic wiring method is: two SFP-10G-SR modules at both ends, two duplex LC fiber jumpers to connect the module and the MTP-LC fiber distribution box respectively, and then An MTP trunk jumper connects the distribution box. If you need to upgrade to a 40G-40G network, there are the following two solutions: choose two QSFP-SR4-40G optical modules, replace the previous two LC fiber patch cords with MTP patch cords, and replace the fiber distribution box with an adapter Panel, and then connect the adapter panel with the original MTP jumper. If you use two QSFP-BD-40G optical modules, you only need to replace the modules at both ends, and other devices can be reused, without changing the existing 10G wiring pattern throughout the process.

So if you want to estimate the existing network layout and save costs, then we suggest you choose QSFP-BD-40G optical module, and if you want to prepare for future network upgrades and deployment, you may wish to consider increasing your investment in building one The data center based on MTP wiring system is naturally the most suitable optical module of QSFP-SR4-40G.

2. Unstructured wiring

In unstructured cabling systems, optical fiber jumpers are often directly connected to equipment. This mode is suitable for connections between short-distance equipment in data centers. Two QSFP-SR4-40G optical modules with a polarity B MTP jumper can be used to achieve 40G direct connection, and two QSFP-BD-40G optical modules with a duplex LC multi-mode jumper can also be used 40G direct connection. Since the existing 10G network connection usually uses LC multi-mode fiber optic patch cords, it is obvious that when upgrading from 10G to 40G, the QSFP-BD-40G optical module can reuse the existing patch cords to reduce the cost. The cost-based approach quickly realizes the conversion from 10G to 40G.

As a technological breakthrough in the development of 40G networks, QSFP-40G-SR-BD optical modules can upgrade from 10G to 40G without changing the existing 10G wiring, with high flexibility and simplicity. The QSFP-40G-SR4 optical module, as another solution, is also widely used in 10G-40G upgrades. Through the introduction of this article, I hope to help you understand these two schemes better, and choose the most suitable one according to your actual situation.

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