When deploying 25G access and 100G aggregation, there are two constraints that are easily overlooked: panel density and single-port power consumption. They directly determine how many servers a rack can carry, whether switch fans will be pulled up, and whether jumpers will block adjacent ports. This article will clear up these two accounts at once.

Density: How many mouths can be packed into 1U

The port size of QSFP28 is about twice that of SFP+. Mainstream 1U leaf switch panels commonly have 32 or 48 100G ports; the dual-port card on the server side occupies a standard slot and can be configured for storage and gateway servers.PCI-EX16 100G dual optical port fiber optic network card (Intel Intel E810 chip). Two practical suggestions: Check the bending radius of the jumper in advance to conflict with the adjacent opening, and choose low-profile jumpers when the panel is tight; the positions of the supporting cabinet distribution frames and cable management frames should be determined at the procurement stage, and do not wait for them to be blocked before rework.

Power consumption: module, cable and heat dissipation linkage

• The typical power consumption of 100G optical modules is about 3.5W each, and the same speed DAC is significantly lower at short distances;
• When the 48-port 100G is fully loaded, the module alone is a superimposed heat source of more than 100 watts, and the air duct design needs to be upgraded accordingly;
• Prioritize DAC within three meters of the cabinet to reduce light sources and heat spots;
• The operating shell temperature of optical modules is generally in the range of 0 to 70°C. High-density cabinets need to confirm the inlet air temperature instead of just reading the specifications.

Make trade-offs based on scenarios

25G modules or multi-mode or DAC are the mainstream for computing access; 100G is used for storage and backbone; 40G is mostly stock equipment, and the power consumption and density per unit bandwidth are not as cost-effective as the 25G/100G combination. EB-LINK'sData center high-speed interconnection solutionThe page lists the model configurations according to scenarios. You can make a rough calculation of density and power consumption based on the cabinet diagram.

First determine the density based on the number of ports and cable management space, and then check the rack power supply and cooling margin based on the total power consumption of the module. Once the two accounts are aligned, there will be no major deviations in 25G/100G deployment. If you are not sure about the fan and temperature strategy, you can call 0755-83179002 to find technical support for verification.