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DCP Configuration
4-333920-A2-GN31-30 November 1996
DTE Interface — Singleport Mode A
The DTE Interface configuration options contain EIA-232-D (CCITT V
.24) and asynchronous
character format information essential for maintaining a connection and for transmitting data
between the DTE and the modem.
Table 4-7 shows each DTE Interface configuration option as it appears on the LCD, with the Sync
Leased factory default setting (the default value if the modem is just being installed) shown
following the colon ( : ) on the first line and with all available selections listed on the second line.
Following this is a description of the configuration option. Factory default settings are listed in
Appendix F.
Table 4-7
(1 of 8)
DTE Interface Configuration Options — Singleport Mode A
Async/Sync Mode: Sync
Nxt Sync Async
Asynchronous/Synchronous Mode. Determines whether the modem operates in Asynchronous mode or Synchronous
mode. If the AT command set is enabled and this configuration option is set to Sync, then the modem operates in Async
mode when offline.
For Async Dial, Async Leased and UNIX Dial, Async is the factory default.
The AT commands for Async Mode are &M0 or &Q0.
The AT commands for Sync Mode are &M1, &M2, &M3, or &Q1, &Q2, &Q3.
Async DTE Rate: 19200
Nxt 19200 57600 38400 28800 14400 12000 9600 7200 4800 2400 1200 0–300
This configuration option only appears when Async/Sync Mode is configured for Async.
Asynchronous DTE Data Rate. Identifies the asynchronous DTE’s operating rate to the modem. Data rates from
57,600 bps to 300 bps are supported.
NOTE: To prevent losing data in 57,600 bps applications, a 16650 UART on the PC’s serial port is required, as well as
a communications package which can take advantage of its 16-byte buffer. In addition, a 386 PC (25 MHz or
faster) is required, and the RS232 cable length must be minimized to reduce capacitance.
NOTE: To configure the Async DTE Rate differently than the modem rate, ensure that the Error Control Mode
configuration option (see the
V.42/MNP/Buffer — Singleport Mode
section) is set to BufferMode.
The AT prefix determines Async DTE Rate.