Comdial Air Impact DSU, Manual

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The user controls the DIU by pressing a preprogrammed DATA button on his/her digital
telephone. The installer can also program a DATA button on a remote telephone that can
control the DIU as well. The DATA LED on the digital telephone provides the user with
visual feedback on DIU status.
The system administrator can program up to three security groups and assign them to
work groups. This safeguards stored data on IST devices such as personal computers by
denying access to users from outside the group. For example, if a caller in security group
1 calls a station in security group 2, and the IST device on the DIU at the called station is
selected, the caller will hear a busy tone. When the multiline telephone on the DIU is
selected instead, the caller can make a station to station call in the normal manner.
The DIU will operate reliably at baud rates up to 9600 (outside calls) and 14400
(intercom calls).
Data Security
This data security feature will prevent any type of tone (DTMF, camp-on, barge-in, etc.)
from interrupting a call that is active on a port programmed with the feature. This
prevents interference to non-voice communications from occurring when the port is
being used as a data port (when operating a modem through an ATI-D port for, example).
The programmer can use station class of service programming to enable a data security
port.
Default Functional Program
At initial power-up, the system sets the operating features to a specific group of operating
conditions (default conditions). The default conditions provide a complete operating
system for normal use. The installer can leave the system defaulted or reprogram as
desired. After a programmer has reprogrammed a system, he or she can re-default it by
using the system, line, and station class of service programming or use a master clear to
default the entire system and erase all stored programmable button information.
See also, Class Of Service.
Default Toll Restriction
The system defaults two toll restriction tables with pre-programmed values and
pre-assigned to all lines. The programmer needs only to assign these tables to the stations
by programming action to put them into effect. He or she can use the toll restriction table
configuration class of service programming to reprogram the defaulted tables with
different information as needed.
See also, Toll Restriction.
IMI66–107 Digital Telephone System
Digital Telephone System Features A – 21