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In data centers, 100G QSFP is considered as the dominant form factor for 100G Ethernet. Various 100G interfaces are developed to satisfy a broad range of applications. The increasing popularity of 100G Ethernet is pushing Ethernet users to upgrade their existing 10G infrastructure to 100G. In this article we are going to discuss two specific QSFP28 based transceivers; CWDM4 and PSM4 and differences between them.

400G a reality now! The main benefit in moving from 100G to 400G is that superior connectivity achievable between the leaf and spine. However, older form-factors are not compatible with 400G optics. Thus, new form-factors were required. Currently, there are two recognized and regularized form-factors for 400G cables and optical modules