BCM5221A4KPTG

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BCM5221A4KPTG Application Field and Working Principle

BCM5221A4KPTG is an Ethernet switch chip from Broadcom. Its purpose is to enable gigabit Ethernet switching in an Ethernet network. It provides an Ethernet switch for connecting multiple devices, eliminating the need for Ethernet hubs. The Broadcom BCM5221A4KPTG is a single chip switched-mode power supply (SMPS) device integrating an 8-port Ethernet switch, low-power PHY, and a fast Ethernet media access controller (MAC).

Applications

The BCM5221A4KPTG is ideal for applications that require integration and cost savings, such as enterprise and small office networks and service providers’ metro or access networks. It is also suitable for low power, home gateway and set-top boxes applications. The BCM5221A4KPTG enhances network performance through support for the IEEE 1588v2 standard for time synchronization, as well as for IEEE 802.3ah Ethernet in the First Mile (EFM) standard.

With 8 ports, the BCM5221A4KPTG has the ability to connect multiple users and/or devices to a single switch, allowing for more efficient utilization of available resources. The BCM5221A4KPTG is also capable of simultaneously supporting multiple VLANs and provides port-based Quality of Service (QoS). In addition, the BCM5221A4KPTG support jumbo frames, enabling larger packets, and can handle speeds up to 1 Gbps.

Working Principle

The BCM5221A4KPTG switch controller is based on a register-centric architecture. The high-level register model helps host processors or firmware load configuration data directly onto the switch. This data includes a port VLAN membership list, 802.1p (QoS layer 2) mapping, 802.1q VLAN tag manipulation and discard logic, jumbo frame size, link auto-negotiation, and link aggregation configuration.

The BCM5221A4KPTG adheres to industry standard IEEE 802.3 Ethernet switching specifications. Its 8 ports support full-duplex 10/100 Mbps Ethernet, Gigabit Ethernet (GbE), and jumbo Ethernet frame sizes of up to 9K bytes. With support for flow control, full-duplex indicates traffic can flow in both directions simultaneously. Additional features include link aggregation for policy-based port trunking, 802.1 scheduler for access bandwidths control as well as an IEEE 802.3ah EFM feature to establish and maintain communication between clients and servers in an Ethernet network.

Conclusion

The BCM5221A4KPTG is a high-performance, integrated Ethernet switch device that enables gigabit Ethernet switching on an Ethernet network. It is ideal for applications that require integration and cost savings, such as enterprise and small office networks and service provider’s metro or access networks. It also supports jumbo frames, link aggregation, policy-based port trunking, and 802.1 scheduler for access bandwidths control, making the BCM5221A4KPTG well-suited for many applications.

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