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1. 发明授权

US06516352B1 Network interface system and method for dynamically switching between different physical layer devices 有权
标题翻译：用于在不同物理层设备之间动态切换的网络接口系统和方法
公开(公告)号：US06516352B1
公开(公告)日：2003-02-04
申请号：US09135074
申请日：1998-08-17
申请人： Bradley J. Booth , Nestor A. Fesas, Jr. , Robert O. Sharp , William Kass
发明人： Bradley J. Booth , Nestor A. Fesas, Jr. , Robert O. Sharp , William Kass
IPC分类号： G06F1516
CPC分类号： H04L12/403
摘要： A system and method for dynamically switching between different physical layer devices (PHYs) in a network interface. The system comprises a network interface in a network device, e.g., a network card in a computer system which includes a first PHY device and a second PHY device. The first PHY device is coupled to a first transmission medium (such as fiber-optic cable) which requires a continuous connection to the computer system when active. For a SERDES device, this continuous connection is required because the PHY needs constant access to its physical coding sublayer (PCS), which is located external to the PHY. The second PHY device is coupled to a second transmission medium (such as copper cable) which does not require this continuous connection. This second PHY may be, for example, a G/MII device, which includes the PCS internally. The network interface card further includes a link switching unit, a physical layer interface unit, and a control unit. The control unit generates a select signal indicating which physical layer device is currently selected. Accordingly, the link switching unit transfers data between the physical layer interface unit and the currently selected physical layer device. The physical layer interface unit receives incoming data from either the link switching unit or an external interface of the network interface card. The physical layer interface unit includes two sub-layers corresponding to each of the physical devices. These sub-layers each produce outgoing data in response to the incoming data, and the appropriate outgoing data is chosen based on the currently selected physical layer device.
摘要翻译：一种用于在网络接口中动态切换不同物理层设备（PHY）的系统和方法。该系统包括网络设备中的网络接口，例如包括第一PHY设备和第二PHY设备的计算机系统中的网卡。第一PHY设备耦合到第一传输介质（例如光纤电缆），其在活动时需要连续连接到计算机系统。对于SERDES设备，需要这种连续连接，因为PHY需要对其位于PHY外部的物理编码子层（PCS）的持续访问。第二PHY设备耦合到不需要这种连续连接的第二传输介质（例如铜缆）。该第二PHY可以是例如在内部包括PCS的G / MII设备。网络接口卡还包括链路切换单元，物理层接口单元和控制单元。控制单元产生指示当前选择哪个物理层设备的选择信号。因此，链路切换单元在物理层接口单元和当前选择的物理层设备之间传送数据。物理层接口单元从链路交换单元或网络接口卡的外部接口接收输入数据。物理层接口单元包括与每个物理设备相对应的两个子层。这些子层各自响应于输入数据产生输出数据，并且基于当前选择的物理层设备选择适当的输出数据。

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