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X21
Uses X21 dialling for numbers in the DVST menu
Connection can be made in the direct mode, where the number to be called is stored in
the terminal adapter, or in the X21 dialling mode where the DVST passes the number to
be dialled to the Terminal Adapter, or ATMODE.
V35
V35=ON/OFF
Applicable in all modes (ATMODE, DIRECT and X21)
8.2 Connecting a terminal adapter in direct mode
This uses the signalling lines; C (control) and I (indicate), to respond to and initiate calls.
Making a Call
The DVST initiates a call by raising C
The TA then dials its stored number
When the call is connected the TA raises I
Call continues
Answering a Call
The TA indicates an incoming call by raising I
The DVST responds by raising C
Call continues
Call disconnection
The DVST ends a call by dropping C
The TA confirms disconnection by dropping I
Configuring a Terminal Adapter for direct mode operation
As the control linesI&Careused to control calls, the following is required of the system:
Answer : C
Originate : C
Disconnect : C
Alerting : I
DCD/I : Delay
Note: The above settings are the basic requirements. TAs have many other settings which
can affect transmission such as speed of call, type of call, circuit switch etc.
Page 32 Dedicated Micros Ltd
Terminal Adapters DVST Installation Guide