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Inter-DC Connectivity optionsHere are the most common 400G optics modules used for inter-DC connectivity.Optics Type: 400G-LR4 Description: Up to 10km over 1x SM fiber pair, using four 100G PAM4 optical signals muxed on the fiber pair. Fiber Type & fiber connector: Single-mode fiber, Duplex LC connector Use Case: For DCI applications for up to 10km.Optics Type: 400G-LR8 Description: Up to 10km over 1x SM fiber pair, using eight 50G PAM4 optical signals muxed on the fiber pair. Fibe

Between Leaf & Spine and Spine & DCI connectivity optionsOptics Type: 400G-FR4 Description: Up to 2km over 1 SM fiber pair, using four 100G PAM4 optical signals muxed on the fiber pair. LC connector is used. Fiber Type & fiber connector: Single-mode fiber, Duplex LC connector Use Case: Usually used between leaf, spine & DCI within data centers, or across data centers for up to 2km useOptics Type: 400G-2FR4Description: Up to 2km over 2 SM fiber pairs, each fiber pair carry

Between ToR & Leaf Connectivity OptionsOptics Type: 400G-AOC Description: Up to 30m over multiple MM fiber pairs. AOCs provide a complete solution, that includes two optics modules connected using multiple fiber pairs. They come in different fiber lengths to cater to different customer requirements. Fiber Type & fiber connector: Usually MM fiber Use Case: It is a cost-effective optical connectivity option for short reach (up to 30m).1-400G QSFP-DD to 400G QSFP-DD, 400GE/200GE/HDR

400G ToR to Server/storage Connectivity optionsOptics Type: 400G-Direct Attach Cables (DAC) Description: QSFP-DD (Double-Density) passive copper cable assemblies provide 8 data transmission channels at speeds up to 25Gbps/lane NRZ and 50Gbps/lane PAM4. It enables 200G/400G in an application, with lengths 0.5-2 meters.. Fiber Type & fiber connector: Usually high-speed copper pairs Use Case: It is a cost-effective within-rack connectivity option for short reach (up to 3m).1- 40

Migrating to 400G? Choosing the Right OptionAs customers deploy 400G connectivity, they are transitioning from 25/100G connectivity to 100/400G connectivity for the different tiers of the network. Before making a decision, you should carefully consider your technical needs and budget with these parameters in mind: Reach: the distance you need to transmit dataPower ConsumptionFlexibility – bending ratio. This is particularly important in tight spacesCost Let us