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V.25 bis Command Set Operation
ITU-T V.25 bis Command Procedures
The following paragraphs describe communication operating procedures for the V. 34 using the
ITU-T V.25 bis command set. The descriptions include procedures for originating, answering, and
terminating a call in the 108.2 and 108.1 modes.
108.2 Mode Operating Procedures:
Originating a Call
To establish communication by originating a call in the 108.2 mode:
1. From the DTE, use the CRN or CRS command to dial the desired telephone number.
2. When communication is established, your terminal displays the CNX response (if enabled
with the PRS CM ; 1 command) and you may transfer data.
Automatic Call Answering
To have the modem automatically answer calls and establish communication:
1. Enable automatic answering by typing:
PRS AA ; n <LF>
where n is the number of rings (from 1 to 255) that the modem will wait before it performs
automatic answering. The default is 4.
2. The modem answers any incoming call automatically after the specified number of rings.
3. When communication is established, your terminal displays the CNX response and data
transfer can take place. If communication is not established, your terminal will display the
appropriate response and the modem will return to the command mode.
Manual Call Answering
The command PRS AA ; 0 <LF> disables automatic call answering. When automatic answering is
disabled, use the following procedure to establish communication by manually answering calls:
1. When your terminal displays the INC result code to indicate an incoming call, type:
CIC <LF>
2. When communication is established, your terminal displays the CNX response and data
transfer can take place. If communication is not established, your terminal will display the
appropriate response and the modem will return to the command mode.
Automatic Call Termination
The modem automatically terminates a call if:
•
Terminal interface signal 108.2 (DTR) is turned Off while the modem is in data mode. This
mode of automatic termination functions only when DTR is optioned for normal operation; it
is disabled if 108.2 is optioned for forced On operation.
•
The handshaking sequence is not completed within the abort time period (selected by the S7=x
AT command; default is 30 seconds) after originating or answering a call.
060R122-000
Issue 15
ITU-T V.25 bis Command Procedures
SpectraComm Dual V.34 Modem
Installation and Operation
5-9
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