VSC8489, VSC8490, and VSC8491 family of single-port and dual-port 10G Ethernet transceivers provides a highly flexible solution ideal for electrical backplane and optical module host card applications. Designed to meet all SFP+ SR/LR/ER/ZR Fiber, EDC compensated MMF, and direct attached cable host requirements (in accordance with the SFF-8431 specifications), the devices compensate for optical impairments in SFP+ applications along with degradations of the PCB. The VSC8489/90/91 device family also provides full 10GBASE-KR support (including Clause 73 auto-negotiation and Clause 72 transmit training), as well as highly flexible clocking options for Ethernet LAN and WAN operations and Synchronous Ethernet (Sync-E). Microchip's complimentary and confidential [MicroCHECK](https://www.microchip.com/en-us/support/design-help/design-check-services) design review service, which offers insight from the initial concept to the final PCB layout, is available to customers who are using our products in their projects. You can confidently submit your design materials in a secure and private setting, and our expert engineers will provide individualized feedback to enhance your design. MicroCHECK design review service is subject to Microchip's [Program Terms and Conditions](https://www.microchip.com/en-us/support/design-help/design-check-services/design-check-services-program-terms-and-conditions) and requires a myMicrochip account.