BCM54685E

Octal-Port QSGMII to 10/100/1000BASE-T or Fiber Transceiver with EEE Support

The Broadcom BCM54685E transceiver can support either QSGMII to eight copper (10/100/1000BASE-T) ports, or QSGMII to eight Fiber (100BASE-FX, 1000BASE-X, or SGMII-Slave) interfaces. When in QSGMII to Copper mode the PHY performs all of the physical layer (PHY) functions for 1000BASE-T, 100BASE-TX, and 10BASE-T on standard Category 5 UTP cable. When in QSGMII to Fiber mode the PHY performs all of the physical layer (PHY) functions for 100BASE-FX, 1000BASE-X and SGMII-Slave. The BCM54685E is designed to comply with the QSGMII industry standard.

The BCM54685E is based on the proven digital-signal processor technology of Broadcom, combining digital adaptive equalizers, ADCs, phase locked loops, line drivers, encoders, decoders, echo cancellers, crosstalk cancellers, and all other required support circuitry integrated into a single monolithic CMOS chip. With full compliance to IEEE 802.3az Energy Efficient Ethernet standard, the BCM54685E substantially lower power consumption during periods of low-link utilization. In addition, with Broadcom's AutogrEEEn technology, the BCM54685E can be in EEE mode when interfacing with non-EEE enabled MAC switches, allowing system designers to take advantage of EEE technology and realize power savings today. This power savings translates to lower energy costs for organizations that deploy networking equipment using the BCM54685E with EEE and AutogrEEEn technology. For application that require precise and accurate synchronization of nodes in the network, the BCM54685E includes support for 1588 Precision Time Protocol (PTP) and is fully compliant to IEEE 1588-2008(version 2) standard.

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