The BCM5481 is optimized for low power and small footprint size to enable uplink and general Gigabit Ethernet connectivity applications. By lowering system cost and reducing power dissipation, the BCM5481enables a new class of cost-effective Gigabit Ethernet equipment, driving the delivery of Gigabit bandwidth to the desktop. The BCM5481 digital signal processor-based architecture and advanced power management techniques combine to achieve robust and low power operation over the existing CAT-5 twisted-pair wiring.
The BCM5481 architecture also meets the requirements of 802.3, 802.3u, and 802.3ab, but maintains the industry’s highest level of margin over IEEE requirements for Echo, NEXT, and FEXT. Low power is a key factor in implementing Gigabit small form factor NICs and uplinks and, at less than 700 mW per port, the BCM5481 has the industry's lowest power. Also, the BCM5481 has extremely low EMI emissions, which reduces the design constraints required to meet EMI emissions specifications. In addition to supporting the IEEE 802.3 standard Gigabit Media Independent Interface (GMII), the BCM5481 also supports the reduced gigabit media independent interface (RGMII). RGMII is a reduced pin count (12 versus 25) version of the GMII. The small package, multiple MAC interfaces, and streamlined power supply lowers system cost and simplifies the system and board level design.
This device is another member of Broadcom's 0.13µ Gigabit copper PHY family, joining the BCM5461, BCM5461S, BCM5464, BCM5464S, BCM5482, BCM5482S, BCM5488, and BCM5488S. The0.13 µm process is the optimal process that offers the best performance, lowest cost, and lowest power for Gigabit copper solutions. Further, devices based on the 0.13µ process offer an excellent long-term cost curve, enabling better cost reduction over time, compared to older technologies, without having to redesign or requalify a new part. The BCM5481 incorporates a number of advanced features.
The link quality indicator LED provides installers with immediate visual notification of any problems with the wiring plant supporting operation at the desired speed. This includes physical wiring defects that theBCM5481 cannot automatically correct and channel conditions such as excessive cable length and return loss, crosstalk, echo, and noise. Broadcom’s cable analyzer software can be used with the device to provide remote management of the cable and first-level diagnostics and fault isolation. The BCM5481 also has ESD tolerance that exceeds typical industry standards. This prevents ESD damage not only during manufacturing but also during cable-sourced electrostatic discharge (CESD) events in the field. CESD is an ESD event that occurs when an electrically charged network cable is plugged into a network port, an issue becoming more prevalent with contemporary cable installations.