The network card port is just the starting point, and the real connection depends on the set of modules, cables and jumpers. If any of the four types of things, including speed, encapsulation, and wavelength, is right or wrong, the link will not be able to negotiate the nominal bandwidth, and the rework cost is often higher than the card itself.

Select media boundaries based on distance

  • Within 3 meters from the same cabinet to the adjacent cabinet: DAC passive copper cable is the most worry-free, such as25G DAC high speed cable, plug and play without any modules.
  • 3 meters to 30 meters across cabinets: AOC active optical cables can be evaluated, with connectors at both ends to avoid contact resistance problems between modules and jumpers.
  • More than tens of meters across computer rooms or buildings: add single-mode jumpers to optical modules. 25G multi-mode is generally up to 100 meters on OM4. Single-mode usually uses 10 kilometers, and long distances use 40 or 80 kilometers, such asSFP+ 10G single-mode dual-fiber 10km optical module.

Three alignment points of packaging, wavelength and coding

Package to slot: SFP+ to 10G, SFP28 to 25G, QSFP+ to 40G, QSFP28 to 100G. It is a physical rule that it cannot be plugged in. Mixing requires the removal of wires. Wavelength to optical fiber: Multi-mode 850 nm is equipped with OM3/OM4, single-mode 1310 nm is equipped with OS2. The jumper specifications must be purchased in the same batch as the wavelength. Write code to the device: When the switch side is brand-locked, the module can be customized according to Cisco, Huawei, H3C and other brands for free. The network card side is generally universal. Some old chassis have whitelists that need to be confirmed in advance.

Two common configuration examples

25G dual-port access: one network card, two SFP28 multi-mode modules with LC-LC OM4 jumpers, and the link in the same cabinet can be directly replaced with 25G DAC. 100G storage uplink: E810 dual-port card is equipped with four QSFP28 modules. For inter-building links, the optical power link budget is first made and then the transmission distance is determined. For batch projects, it is recommended that network cards, modules, and jumpers be purchased in the same batch. EB-LINK is tested one by one before leaving the factory and is labeled and shipped according to the port corresponding table to reduce on-site cross-checking.Product category pageIt can be selected one by one according to the port speed; if the port does not match, you can also dial 0755-83179002 to check.