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.
HDisable
Disables any type of DTE dialing method. Dialing can only be performed using the DCP’s Dial
command or attached telephone.
HAT 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.
HV.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.
HV.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.
HV.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.
HDTR=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.
HAT&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.