美国BIT公司在交换以太网方面已进行了一些研究。PMC-Sierra公司去年秋季获知后,在这个研究基础上,首先研制了范围广大的、有计划的系列产品。PMC公司设计了PM3350 8端口交换芯片和PM3351 100Mbit上行线路芯片,但这两个产品远不止是仅对BIT公司已有设计的一般改进。 PMC公司最初开发的局域交换芯片系列的目标是增加虚拟局域网和系统管理功能,包括简单网络管理协 The United States BIT has conducted some research on the exchange of Ethernet. After learning from the fall of last year, PMC-Sierra based on this research, first developed a wide range of planned products. PMC designed the PM3350 8-port switch chip and the PM3351 100Mbit uplink chip, but these two products are far more than just the general improvements that BIT has designed. The goal of PMC’s initial development of the local exchange chip family is to increase the virtual LAN and system management capabilities, including the Simple Network Management Protocol.