114Table 159 LED descriptionLED DescriptionLINK/ACT• Off: No link is present;• On: A link is present.• Flashing: Data is being received or transmitted.LP/AL• On: A loopback interface is configured.• Flashing: An alarm indication signal (AIS), loss of frame alignment (LFA)signal, or remote alarm indication (RAI) signal is present.Transceiver modules, optical fibers, and connection methodsFor more information about transceiver modules, optical fibers, and the connection methods, see"Fiber port."Interface mode switchoverYou can switch the FIC-1CPOS to operate in E1 and T1 interface modes at the command lineinterface (CLI).To switch the interface mode:1. Insert the FIC-1CPOS into the FIC slot of the router and then power on the router.2. Use the card-mode command in system view to set the interface mode. The following showsthe FIC-1CPOS module is inserted in slot 4 of the device.# Enter system view. system-view# Set the FIC-1CPOS to operate in E1 interface mode.[Sysname] module-mode slot 4 e1# Set the FIC-1CPOS to operate in T1 interface mode.[Sysname] module-mode slot 4 t1E1/T1 interface module• FIC-1E1• FIC-2E1• FIC-4E1• FIC-1E1-F• FIC-2E1-F• FIC-4E1-F• FIC-8E1• FIC-8E1-F• FIC-1T1• FIC-2T1
