58Step2 Plug the DB-9 (male) connector at the other end into the serial port of the modem.Connecting the switch to the network through a copper EthernetportThe 10/100/1000Base-T electrical ports of the switch support MDI/MDI-X auto-sensing. They areconnected to the network through category-5 or above twisted pairs that are equipped with RJ-45connectors.Connection procedureFollow these steps to connect a 10/100/1000Base-T port:Step1 Plug one end of an Ethernet twisted pair cable into the electrical Ethernet port (RJ-45 port) to beconnected on the switch.Step2 Plug the other end of the cable into the RJ-45 port of the peer device.NOTE:No Ethernet twisted pair cables are shipped with the switch. Prepare them by yourself.Connecting the switch to the network through a fiber EthernetportUse an optical fiber to connect an XFP, SFP, or SFP+ port on the switch to the network. You must install atransceiver module to the switch, and then insert the fiber connector to the module.Introduction to fiber connectorFiber connectors are indispensable passive components in an optical fiber communication system. Theyallow the removable connection between optical channels, which makes the optical system debuggingand maintenance more convenient and the transit dispatching of the system more flexible. Amongvarious fiber connectors, only the LC connector is described here.Figure 47 LC connectorPrecautionsFollow these precautionary steps:• When selecting a fiber network facility, make sure that the type of the connector and the fibermatches the adopted optical port.• Be sure to install the dust cover if the optical port is not connected to a fiber connector.• Some invisible rays may be emitted from the optical port if the optical port is not connected to afiber connector or the dust cover is removed. Therefore, never stare at the optical port directly.• Never bend or curve a fiber when connecting it.
