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    • 4. 发明授权
    • Method and apparatus for support of tagging and untagging per VLAN per port
    • 支持每个端口每个VLAN的标记和取消标签的方法和设备
    • US06680945B1
    • 2004-01-20
    • US09317145
    • 1999-05-24
    • Shashank MerchantRobert A. Williams
    • Shashank MerchantRobert A. Williams
    • H04L1256
    • H04L45/00H04L12/4645H04L12/467H04L45/50
    • An integrated multiport switch operating in a packet switched network provides the capability via distributed egress logic to alter VLAN tags on a port by port basis. An internal rules checker (IRC) analyzes the header of a data frame to determine the frame type: untagged, VLAN-tagged, or priority-tagged. The IRC searches the untagged set table for the set of ports that are untagged for a particular VLAN. The IRC passes a forwarding descriptor that includes the frame type and a operational code (opcode) to a Port Vector FIFO logic (PVF). The PVF is responsible for creating a new opcode that instructs a dequeuing logic to add, remove, modify the VLAN tag, or send the frame unmodified. The opcodes generated by the PVF are individualized for each output port.
    • 在分组交换网络中操作的集成多端口交换机通过分布式出口逻辑提供了在端口上改变VLAN标签的能力。 内部规则检查器(IRC)分析数据帧的头部以确定帧类型:未标记,VLAN标记或优先级标记。 IRC在未标记的集合表中搜索针对特定VLAN未标记的端口集合。 IRC将包含帧类型和操作码(opcode)的转发描述符传递给端口向量FIFO逻辑(PVF)。 PVF负责创建一个新的操作码,指示一个出队逻辑来添加,删除,修改VLAN标签,或者发送未修改的帧。 由PVF生成的操作码针对每个输出端口进行个性化。
    • 8. 发明授权
    • Arrangement for initiating and maintaining flow control in
shared-medium, full-duplex, and switched networks
    • 在共享介质,全双工和交换网络中启动和维护流量控制的布置
    • US5905870A
    • 1999-05-18
    • US709889
    • 1996-09-11
    • Jim ManginShashank MerchantMohan Kalkunte
    • Jim ManginShashank MerchantMohan Kalkunte
    • H04L12/413H04L12/56H04L29/06G06F3/00G06F13/00
    • H04L47/10H04L47/30H04L69/12H04L12/413H04L49/30H04L49/351
    • Flow control signals in half-duplex and full-duplex networks are initiated and maintained based on the detected number of data bytes stored in a receive buffer from payload data of received data packets. If the number of stored data bytes exceeds a predetermined threshold, the network interface initiates flow control. Alternatively, the decision to initiate flow control may be based upon the rate at which the receive buffer is emptied compared to the number of stored data bytes in the receive buffer, or the rate the data bytes are stored into the receive buffer. The duration of the flow control is calculated as a wait time interval selected in response to the number of stored data bytes. The wait time may be selectively set as an integer multiple of slot times, or as a time interval based on the number of stored data bytes relative to the removal rate. Hence, the precise control and the initiation of the flow control for a specific wait time prevents loss of transmitted data while maintaining network throughput.
    • 基于从接收到的数据分组的有效载荷数据接收缓冲器中检测到的数据字节数来启动和维护半双工和全双工网络中的流控制信号。 如果存储的数据字节数超过预定阈值,则网络接口启动流控制。 或者,启动流控制的决定可以基于接收缓冲器被清空的速率与接收缓冲器中存储的数据字节的数量相比较,或数据字节被存储到接收缓冲器中的速率。 流量控制的持续时间被计算为响应于存储的数据字节数而选择的等待时间间隔。 可以将等待时间选择性地设置为时隙时间的整数倍,或者基于相对于去除速率存储的数据字节的数量的时间间隔。 因此,针对特定等待时间的精确控制和流程控制的启动防止了传输数据的丢失,同时保持了网络吞吐量。