150Interface LEDsFigure 170 FIC-1VT1 panelTable 204 LED descriptionLED DescriptionLINK/ACT• On: Carrier signal has been received.• Flashing: Data is being received or/and transmitted.• Off: No carrier signal has been received.LP/AL• On: The interface is in a loopback.• Off: No loopback or alarm is present.• Flashing: An alarm indication signal (AIS), loss of frame alignment(LFA) signal, or remote alarm indication (RAI) signal is present.Interface cables and the connection methodsFor more information about T1 interface cables and the connection methods, see "T1 interface."Network data encryption module• FIC-HNDEFIC-HNDEIntroductionThe high network data encryption module (FIC-HNDE) delivers IPSec and hardware-based IPpacket encryption. It supports multiple hardware encryption/decryption and hash algorithms, thusproviding encryption with high performance and reliability.The FIC-HNDE is intended for low-end and mid-range modular routers. Installed with an FIC-HNDE,the main board of your router can implement VPN with encryption provided by the FIC-HNDE inaddition to IP packet forwarding.
