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Configuring the Unit
5-213550-A2-GB20-10 February 1995
Table 5-9
(1 of 2)
Backup Configuration Options
Auto Bckup:Disab
Next Enab Disab Prev
Automatic Backup
(only displayed when a DBM is installed, or an external DBU is configured to originate backup).
Controls automatic initiation of a call setup attempt to a remote DBM or modem when there is a failure of the DDS
network. (Automatic dial attempts begin after the Network Time-out expires.)
Enab — Select to initiate backup when there is a failure of the DDS network. The DSU waits for a period equal to
DDS Time-out, and if the DDS network is still down, it attempts to establish a dial backup connection to
the remote DBM.
Disab — Select so that no automatic dial backup connections are attempted.
Backup Dir: 1
Next Chang Prev
Backup Directory
(only displayed when a DBM is installed). The DBM can store 10 telephone numbers or dial strings,
identified by the numbers 1 through 10. Selecting the Backup Directory identifier displays the telephone number stored in
that directory.
Chang — Select to enter or change the telephone number that is displayed.
FacAlOnCMI:Disab
Next Enab Disab Prev
Facility Alarm on Control Mode Idle
(only displayed when Full Mode is enabled, when a DBM is installed, or an
external
DBU is configured to originate backup). Determines whether the DSU treats a control mode idle (CMI) condition as a
facility alarm to trigger automatic dial backup. Configuration option
Auto Bckup
must be enabled, and
RTS Cntrl
set to
FrcOn.
Enab — Select if the DSU should try and attempt to establish a dial backup connection to a remote DSU after the
Network Time-out.
Disab — Select if a dial backup connection should not be attempted when CMI is detected.
AutoRestor:Disab
Next Enab Disab Prev
Automatic Restoration
. Controls whether the DSU automatically terminates the dial backup call when the DDS circuit has
returned to service.
On point-to-point circuits, a Digital Test is run to verify the DDS network. If the Digital Test is successful, user data is
switched back to the DDS circuit.
For a multipoint network with dedicated multipoint dial backup, each tributary may be configured for
Auto Restor
, but will
not occur unless backup was initiated by the tributary. The DDS network is not verified before data is switched back to
the DDS network.
Enab — Select if restoral of the DDS circuit should trigger automatic restoration (after the Restoration Time-out
expires).
Disab — Select if restoral of the DDS circuit is not to trigger automatic restoration.
NtwkTimOut: 0:20 for a control DSU; 01:00 for a tributary DSU
Next Chang Prev
Network Time-out
(only displayed when Full Mode is enabled). Specifies the length of time the DDS network must
remain out of service before the dial backup call attempt sequence is made. (
Auto Bckup
must be enabled.)
When
configured for nondisruptive diagnostics, rate adaption, or if TDM/Flex is enabled, this configuration option must be set to
greater than or equal to 20 seconds.
Chang — Select to enter or change the current settings, which can range from 1 second to 30 minutes. The cursor
has two positions: a minutes field with a range of 0 to 29, and a seconds field with a range of 00 to 59.