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COMSPHERE 3900 Series Modems
5-20 September 1998 3910-A2-GN32-40
Table 5-2
(1 of 5)
DTE Dialer Configuration Options
DTE Dialer Type: Disable
Nxt Disable AT V25bis_Async V25bis_Bsync V25bis_HDLC DTR=Direct1 AT&T_Exclusv
Data Terminal Equipment Dialer Type. Identifies to the modem the type of dialing method and protocol used
by the DTE.
H Disable
Disables any type of DTE dialing method. Dialing can only be performed using the DCP’s Dial
command or attached telephone.
H AT
Allows AT command protocol to be used as a method for entering commands and dialing when
used in an asynchronous application. This is the only valid setting for leased-line applications. The
modem will not respond to AT commands if DTE Dialer Type is not set to AT.
H V.25bis Async
Selects V.25bis Async as the dialing method and protocol used by the modem. The character
length must be 7 data bits with even parity and 1 stop bit.
H V.25bis Bsync
Selects V.25bis Bsync as the dialing method and protocol used by the modem. This is also known
as character-oriented protocol. This framing protocol uses two synchronous control characters and
a start-of-text control character before the text block and an end-of-text control character after the
text block. The correct character structure for V.25bis Bsync dialing is 7 data bits, Odd parity, and 1
stop bit. If the modem is in Asynchronous mode, enter the following command string to configure it
for V.25bis Bsync dialing: AT&F&D1&S1&M233&W. If the modem is already configured for
synchronous operation, perform the following to set the character format: (1) use the modem’s front
panel to access the Async/Sync Mode configuration option and set it to Async; (2) scroll down until
the Asyn #Data Bits configuration option appears and set it to 7 data bits; (3) scroll down and set
the Asyn Parity Bit configuration option to Odd; (4) scroll through the DTE Interface group until the
Async/Sync Mode configuration option appears and set it to Sync; (5) move up one level in the
menu tree or move to the Top-Level menu, and follow the LCD messages to save the new modem
settings.
H V.25bis HDLC
Selects V.25bis HDLC as the dialing method and protocol used by the modem. This is also known
as bit-oriented protocol. This framing protocol uses flag, address and control characters before the
text block and a frame sequence check and flag after the text block.
H DTR=Direct1
Allows the modem to automatically dial the number stored in directory location 1 whenever DTR
turns ON. DTR dialing cannot be used if dial access security is enabled.
H AT&T Exclusive
Enables a subset of the proprietary AT&T command set, which is required for some applications
that use AT&T equipment. Currently, the only application supported is AT&T DATAKIT.
The AT commands for AT are &M0, &M1, &M3 or &Q0, &Q1, &Q3.
The AT commands for DTR=Direct1 dialing are &M2 or &Q2.