27Interface LEDsFigure 32 SIC-2FXS1FXO panelTable 37 LED descriptionLED DescriptionLINK/ACT• Off: The link is idle.• Steady green: The link is being occupied for call connection.• Flashing yellow: The link is being occupied for communication.Interface cables and the connection methodsFor more information about FXS/FXO interface cables and the connection methods, see"ADSL/BS/FXS/FXO/AM/FCM interface."DSIC-4FXS1FXOIntroductionThe 4-port analog subscriber circuit interface module and 1-port voice AT0 loop trunk interfacemodule (DSIC-4FXS1FXO) serve to access and handle five channels of analog voice signals overdata communication networks.• FXS interfaces are analog subscriber line interfaces that provide ordinary analog telephone andfax access and also can connect AT0 loop trunks of exchanges.• FXO interfaces are loop trunk interfaces that provide access of common subscriber lines ofexchanges.Interface specificationsTable 38 Interface specificationsItem DescriptionConnector type RJ-11Number of connectors 4 FXS interfaces1 FXO interfaceInterface standard• Supports subscriber circuit interface (FXS), compliant with ITU Q.512• Supports loop trunk interface (FXO), compliant with ITU Q.552• Over-current and over-voltage protection compliant with ITU K.20Cable type Telephone cable with ferrite coreDial-up mode Supports DTMF, compliant with GB3378, but does not support pulse dial-up.Bandwidth 300 Hz to 3400 Hz
