There are many QSFP28 products on the market, including QSFP28 DAC, QSFP28 AOC, and QSFP28 optical modules. Therefore, there are various transmission schemes for 100 networks, and we can choose flexibly according to different transmission distances.
1. Wiring in the rack, suitable for transmission distance <5 meters
2. Use multi-mode optical fiber connection between switches to achieve a transmission distance of <100 meters
There are two schemes to realize this kind of transmission. One is to use QSFP28 AOC with a length of 3m~20m for connection; the other option is to use QSFP28 SR4 optical module to connect with 12-core MTP OM3/OM4 optical fiber jumper (supporting a transmission distance of 100 meters.
3. Use multi-mode optical fiber connection between switches to achieve a transmission distance of 100m~2km
For medium and long-distance connections, cost issues often need to be considered in the implementation process. PSM4 QSFP28 optical modules and CWDM4/CRL4 QSFP28
optical modules are suitable for operation in medium and long-distance 100G networks. The CWDM4/CRL4 QSFP28 optical module has a longer transmission distance. When used with single-mode fiber, the transmission distance can reach 2 km, the PSM4 QSFP28 optical module is used with 8 parallel single-mode fibers, and the transmission distance is about 500 meters, which can also meet Claim.
4. Use single-mode fiber to realize transmission distance: ≤10km
For long-distance transmission, the QSFP28-100G-LR4 optical module with LC interface is the best choice. It is usually used with single-mode fiber. However, the cost of this type of optical module is relatively high, and it needs to be taken into consideration when selecting it.
