HP 8/20q HP StorageWorks 8/20q Fibre Channel Switch Installation and Reference - Page 11
Port Activity LED (green), Transceivers, Port types, Table 1 Fibre Channel port types - fiber channel switch
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Port Activity LED (green) The Activity LED indicates that data is passing through the port. Each frame that the port transmits or receives illuminates this LED for 50 milliseconds. This makes it possible to observe the transmission of a single frame. Transceivers The 8/20q Fibre Channel Switch supports SFP+ optical transceivers for the Fibre Channel ports. A transceiver converts electrical signals to and from optical laser signals to transmit and receive data. Duplex fiber optic cables plug into the transceivers which then connect to the devices. A port is capable of transmitting at 8 Gb/s, 4 Gb/s, or 2 Gb/s; however, the transceiver must also be capable of delivering at this rate. The SFP+ transceivers are hot-pluggable. This means that you can remove or install a transceiver while the switch is operating without harming the switch or the transceiver. However, communication with the connected device will be interrupted. For information about installing and removing SFP+ optical transceivers, see "Install the transceivers" (page 36). Port types The 8/20q Fibre Channel Switch supports generic ports (G_Port, GL_Port), fabric ports (F_Port, FL_Port), expansion ports (E_Port), and transparent routing ports (TR_Port). Switches come from the factory with all Fibre Channel ports configured as GL_Ports. Table 1 describes generic, fabric, expansion, and transparent routing port functions. Table 1 Fibre Channel port types Port type Description GL_Port Generic loop port-self-configures as an FL_Port when connected to a loop device, as an F_Port when connected to a single device, or as an E_Port when connected to another switch. If the device is a single device on a loop, the GL_Port will attempt to configure first as an F_Port, then if that fails, as an FL_Port. G_Port Generic port-self-configures as an F_Port when connected to a single device, or as an E_Port when connected to another switch. FL_Port Fabric loop port-supports a loop of up to 126 devices. An FL_Port can also configure itself during the fabric login process as an F_Port when connected to a single device (N_Port). F_Port Fabric port-supports a single device. E_Port Expansion port-expands the fabric by connecting 8/20q Fibre Channel Switches. The 8/20q Fibre Channel Switch self-discovers all inter-switch connections. For more information, see "Multiple switch fabrics" (page 20). TR_Port Transparent routing port-expands the fabric by connecting an 8/20q Fibre Channel Switch to an HP StorageWorks B-series or C-series remote fabric. The TR_Port provides transparent communication between local fabric devices and remote fabric devices while maintaining separate fabrics. For more information, see "Transparent routing" (page 21). HP StorageWorks 8/20q Fibre Channel Switch Installation and Reference Guide 11