Introduction of 40G optical module and DAC / AOC

When deploying 40G Ethernet, 40G QSFP + optical module and 40G DAC / AOC high-speed cable are the main choices for most users.

40G optical module covers a variety of models, the full range of third-party compatible QSFP + optical module, QSFP + DAC / AOC high-speed cable can be compatible with mainstream brands.

QSFP + and CFP optical modules

How to choose the right 40G optical module?

It is suggested to choose the appropriate 40G optical module flexibly according to the actual transmission distance.

1. In short distance application scenarios, when the transmission distance is less than 1000m, you can choose QSFP 40G SR4, 40Gbase SR bidi, QSFP 40G csr4 or QSFP 40G univ optical module. Both QSFP 40G SR4 and 40Gbase SR bidi optical modules can reach a transmission distance of 150 meters on the optical fiber jumper. The only difference is that the former is transmitted on OM4 optical fiber jumper, while the latter is transmitted on a duplex multimode jumper with LC connector. QSFP 40G CSR4 is an enhanced version of QSFP 40G SR4 optical module. The maximum transmission distance on OM4 fiber jumper is 400m. In addition, QSFP 40G univ optical module can also transmit 150 meters on multi-mode fiber jumper and 500 meters to 2000 meters on single-mode fiber jumper, but the transmission distance varies from supplier to supplier.

2. In long-distance application scenarios, when the transmission distance is greater than 1000 meters, you can choose QSFP 40G plrl4, 40G plr4, WSP q40G lr4l, QSFP 40G LR4 and QSFP 40G Er4 optical modules. Both QSFP 40G plrl4 and 40G plr4 optical modules are equipped with MTP / MPO connectors. The former can transmit a distance of 1km or 1.4km on single-mode optical fiber, while the latter has a link length of 10km. As for WSP q40G lr4l, QSFP 40G LR4 and QSFP 40G Er4 optical modules all have the same working principle: first multiplex four transmit channels to one fiber, and then multiplex four receive channels to another fiber. Among them, QSFP + ER4 module can transmit a maximum distance of 40 km on the single-mode fiber jumper..

Overview of 40G QSFP + DAC high speed cable

40G DAC is a high-speed cable with QSFP + connectors at both ends, which is usually used to connect switches, routers and servers. The maximum transmission distance of 40G DAC high-speed cable is 15m, which can meet the short distance connection requirements of emerging data centers and high-performance cloud computing applications. 40G DAC high-speed cable can be divided into 40G active high-speed cable and 40G passive high-speed cable. The main difference between the two kinds of high-speed cable is whether there is power supply. QSFP + DAC passive high-speed cable is a passive device, which does not consume any power and generate any heat, while QSFP + DAC active high-speed cable needs power to make the internal circuit work and bridge a longer distance. 40G DAC high-speed cables are mainly divided into two types: QSFP + to QSFP + DAC high-speed cables and QSFP + to 4 SFP + 1:4 high-speed cables.

Overview of 40G QSFP + AOC high speed cable

Because of its stability and flexibility, 40G QSFP + AOC high-speed cable can replace copper cable to some extent, and can also be used in data center and high-performance computing network wiring. QSFP + AOC high-speed cable can be defined as a fiber jumper with 40G high-speed connector at both ends. It uses photoelectric conversion at the end of the cable to improve the transmission distance of the cable. At present, a variety of QSFP + AOC high-speed cables for 40G Ethernet have been launched in the market, such as 40G QSFP + to QSFP + AOC high-speed cable, 40G QSFP + to 4-SFP 1:4 AOC high-speed cable and 40G QSFP + to LC 1:8 AOC high-speed cable. They are usually used for short distance multi-channel data communication and interconnection between two devices, such as rack to rack interconnection, storage devices, hubs, switches, routers, connections between servers, etc.

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