Configuration Commands80-10100000-09 4–29xx is NORMAL or FORCEDFor speeds below 64Kbit/s, control signals are transferred across theISDN backup link, and the output of I/DSR to the USER port isdependent on the C/DTR input at the remote KBU 64.When set to NORMAL, I/DSR is dependent on C/DTR at the remoteKBU 64.Where control signals are not transferred, the I/DSR output signal isinactive.When set to FORCED, the I/DSR signal is always active during an ISDNbackup.This is the default setting and it is recommended for allapplications.4.13.11 Front Panel Backup ButtonsThe front panel buttons provide manual control of back up andrestoration of each channel.When a button is pressed the relevant channel will attempt a backupcall. If the button is pressed again while the backup call is in progress,the ISDN line will be dropped and the KBU will attempt line restoration.Successful backup and restoration will depend on the dedicated linestatus together with other parameter settings such as BACKUP,RESTORE and some delay settings.1> SET BUTTON xx[CR]wherexx is OFF or ONThe factory default for this parameter is ON.4.14 Using the Alternate Number Redialling FacilityWe have already explained in section 4.13.1 that the telephone numberof the remote KBU 64 is held in the STORE parameter of your KBU’sconfiguration.
