本PDF文档详细介绍了Cisco QSGMII（Quad Small Form-factor Pluggable Gigabit Media Independent Interface）规范，涵盖其工作原理、应用场景及与之相关的硬件配置。
Quad Serial Gigabit Media Independent Interface (QSGMII) is designed to meet the following requirements:
- Transmit network data and port speed for four ports between a 10/100/1000 PHY and a MAC with significantly fewer signal pins than required by GMII & SGMII.
- Function in both half-duplex and full-duplex modes at all supported speeds.
- The implementation can be extended to other port-to-channel ratios, although this is beyond the scope of this document.
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