方案描述：

Design your networking equipment with Broadcom's proven Fast Ethernet transceiver technology. Broadcom's industry leading 10/100 BASE-T Ethernet transceiver chips offer the lowest power, smallest footprint, proven interoperability and advanced features, making it easier and less expensive to build Fast Ethernet network interface cards (NIC), LAN on motherboards (LOM), switches, routers and hubs.

方案设计图：

方案关键器件表：

BCM5248

FEATURES

•24 x 10/100 Mbits, 4 x 10/100/1000 Mbps Ethernet ports

•9.5 Mpps (line rate) aggregate L2 switching capacity

•Integrated L2 table (16K) with auto learning/aging

•Double 802.1Q (Q in Q) VLAN stacking

•MPLS tunnel/VC packet labeling for L2 VPN

•Scalable Fast/Gigabit Ethernet in a system 

• Eight Classes of Service (COS) with WRED and WRR, DSCP/ 802.1p priority 

•256 spanning trees (802.1s and 802.1w) 

•32 link aggregation trunk groups and mirroring 

•Up to 256 L2 multicast groups and hardware packet replication

•Flow control (802.3x) and HOL blocking prevention 

•64 data bit DDR SDRAM with up to 32 MB of buffer memory

• ContentAware™ network processing per port

•Line-rate, multi-field packet classification 

•Support for 802.1p, TOS/DiffServ, rate limiting, policing, and priority/VLAN (single or double) tagging and remapping

SUMMARY OF BENEFIT

•High-density 10/100/1000 Mbps L2 Ethernet switches•9.5-Mpps, full-duplex, line-rate performance across all interfaces 

• New service offerings for ISPs  

•Metro Ethernet-L2 VLAN (Q-in-Q) and MPLS VPN 

•Voice Over IP (VOIP)-guaranteed low latency prioritization•Advanced traffic management-metering, shaping, and scheduling (SP, RR, WRR, WFQ), down to 64-Kbps flows•ContentAware classification, tagging, and remapping provides maximum security and flexibility 

• Broadcom switch API compatibility enables software reuse and faster time-to-market

APPLIATIONS

•High-density multi-layer scalable enterprise 10/100/ 1000Mbps L2 Ethernet switches •Multi-Tenant Unit (MTU) Metro Ethernet VPN multi-layer switches 

•Service provider Metro Ethernet VPN edge switches