COMSPHERE 3600 Series Data Service Units6-32 July 1999 3610-A2-GB91-90Table 6-8(1 of 2)Backup Configuration OptionsAuto Bckup:DisabNext Enab Disab PrevAutomatic Backup. Controls automatic initiation of a call setup attempt to a remote DBM or modem uponfailure of the DDS network, defined as detection of No Signal or Out-of-Service codes, MUX Out-of-FrameThreshold, or excessive bipolar violations. (Automatic dial attempts begin after the Network Time-outexpires.)Enab — Upon detecting a failure of the DDS network, the DSU waits for a period equal to DDSTimeout, and if the DDS network is still down, it attempts to establish a dial backup connectionto the remote DBM specified by the Backup Directory pointer after the Network Time-outexpires.Disab — No automatic attempt is made to establish a dial backup connection.Backup Dir: 1Next Chang PrevBackup Directory. The DBM can store 10 dial strings or telephone numbers, identified by the numbers1—10. This display shows the identifier of the current default dial string to be used to set up a dial backupcall for automatic backup as described in the Auto Bckup configuration option or when the backup commandis received from the DCP or the NMS.Chang — Produces a data entry display for changing the directory entry identifier.BckupOnCMI:DisabNext Enab Disab PrevBackup on Control Mode Idle.1 This configuration option determines whether the DSU treats a control modeidle (CMI) condition as a facility alarm to trigger automatic dial backup. Configuration option Auto Bckupmust be enabled.Enab — Upon detecting CMI for 250 to 500 milliseconds from the network, the DSU attempts toestablish a dial backup connection to a remote DSU after the DDS Time-out expires. Whenenabled, CMI will also generate a Facility Alarm (FA). Do not use this configuration option if theDSU is configured to generate CMI.Disab — No attempt is made to establish a dial backup connection if CMI is detected.AutoRestor:DisabNext Enab Disab PrevAutomatic Restoration. Controls whether the DSU automatically terminates the dial backup call when theDSU determines that the DDS circuit has been returned to service.On point-to-point circuits, a Digital Test is run to verify the DDS network. If the Digital Test is successful, userdata is switched back to the DDS circuit.For a multipoint network with dedicated multipoint dial backup, each of the tributaries may be configured forAutomatic Restoration. Automatic Restoration will not occur unless the backup was initiated by the tributary.The DDS network is not verified before data is switched back to the DDS network.Enab — Restoral of the DDS circuit triggers automatic restoration (after the Restoration Time-outexpires).Disab — Restoral of the DDS circuit does not trigger automatic restoration.1 The remote DSU must be configured for RTS Cntrl = FrcOn.
