User manual

Configuration Commands
80-10100000-09 4–35
A value of 0 (factory default) disables this facility.
4.15.11 TWDATA Timer
When an ISDN backup call is in operation the KBU 64 tests the leased
line by using it’s Talkwire protocol.
The TWDATA timer defines how long this test must be detected as
running successfully, before the KBU 64 will accept that the leased line
has been restored.
Providing that no other failure condition exists and the KBU 64 has been
configured for automatic restoration, the KBU 64 will restore the USER
data to the leased line and then drop the ISDN call:
1> SET DELAY TWDATA xxx[CR]
where
xxx
is the time in seconds (0 to 999).
If set to 0 seconds, the link test will not be used and the KBU 64 will
presume that the leased line can pass data.
4.15.12 DATALOSS Timer
The KBU 64 continuously monitors the data received on the link, when
the USER data is running over the leased line.
The DATALOSS timer is reset when transitions are detected on the
received data. When received data remains at a continuous HIGH or
LOW for the duration of the DATALOSS time period, the KBU 64
assumes that the leased line has failed, and initiates an automatic
backup (if BACKUP has been set to AUTO):
1> SET DELAY DATALOSS xxx[CR]
where
xxx
is the time in seconds (0 to 999).
If the timer is set to 0 seconds, DATALOSS will not be used as a link
failure detection method. It is also not used as a factor for restoral.