KBU 64
User Manual
80-10100000-09
4–28
If any of these are disabled, then restoral will occur without checking for
them.
4.13.9 Using C/DTR
C/DTR configures the received control signal C/DTR on the USER port
of the KBU 64. ‘C’ (Control) is used for an X21 interface, and ‘DTR’ is
used for a V28 or V35 interface.
1> SET C/DTR xx
[CR]
where
xx
is NORMAL, FORCED, ANSWER or BACKUP
When set to NORMAL, the USER supplied C/DTR signal is used by the
KBU 64. This is usually used only for speeds below 64Kbit/s, where
control signal handling is provided.
When set to FORCED, the C/DTR signal is internally forced to the active
state, and the USER signal is ignored. The default setting is FORCED.
This is the recommended setting for all applications.
When set to ANSWER, the KBU 64 will only answer an incoming ISDN
call if the C/DTR signal is active. This can be useful in preventing calls
when, for example a computer port becomes inactive.
When the KBU 64 is set to BACKUP, it will initiate a backup call when
the C/DTR signal becomes active. The call will be maintained until the
C/DTR signal is dropped. This option is useful where a computer port
controls backup initiation.
4.13.10 Using I/DSR
I/DSR configures the output control signal I/DSR on the USER port. ‘I’
(Indicate) is used for an X21 interface, and ‘DSR’ is used for a V28 or
V35 interface.
1> SET I/DSR xx
[CR]
where
