Guest Blog400G is now under release over multiple form-factors: QSDFP-DD, OSFP and CFP8. While the short-term deployment is on the access side, and mainly for intra-DC application, other applications such as DCI and transmission are also going on the 400G direction. As we are now getting familiar with the form-factors and the PAM4 modulation, it is […]
Guest BlogThanks to the 400G technology, a new QSFP28 100G module type is coming. The QSFP28 100GBASE-FR, also called QSFP28 100G single lambda, will be a single laser and a single receiver of 100Gbps instead of being 4x25Gbps (4x lasers and 4x receivers). Back to the regular QSFP28 4x25Gbps The QSFP28 100Gbps is a parallel optic, […]
Guest BlogWhat’s the difference between 400GBASE-LR8 and 400GBASE-LR4? Both QSFP-DD and OSFP transceivers can transmit at 400Gbps using 8 lanes of 50Gbps PAM4 or 4 lanes at 100Gbps PAM4. But what’s the real difference behind 50Gbps PAM4 and 100Gbps PAM4? How do we achieve this transition? Pre-requirements Modulation For all optical transceivers transmitting up […]
Guest BlogWith 400G switches just under release, the industry is already seeing two form factors in competition. What does this mean for the network operators? Why are these two form factors in competition? Are they really in competition? While there are multiple form-factors for 400G bitrates, the QSFP56-DD and OSFP are clearly in competition for all […]
Guest BlogWe are all aware about the SFP+ for 10G and QSFP28 for 100G transmission. A small form factor pluggable, a low-power consumption and an interoperability between all systems vendors; these are the 3 successful criteria for a complete form factor. However, we all remember the situation on 100G, characterised by 4 different form factors: 400G form […]