User's Manual
V34bis Fax-modem - AJ 2885 P
AJ 2885 P - Page 26
5.
Configurations
This chapter describes commonly used configurations through the AT command set: These
commands may be used as part of software drivers for example. The same configuration can
be achieved through the LCD and keypad front panel. Refer to the LCD menu description in
chapter 2.5.
5.1. Factory
configuration
This configuration applies when the modem is first powered on, or after complete reset by the
following commands:
AT&W255 <CR>
Answer : OK
ATZ <CR>
Answer : OK
This configuration is designed for most common applications and has the following
characteristics:
DTE - V24:
Normal CD, DTR,
DSR and CTS forced on.
Automatic answer S0 = 2
Automatic hunt: V34, V32bis, V32, V22bis, V21 and V23 modes
Error correction and data compression: V42bis and MNP automatic mode (*M2)
Flow control: RTS/CTS (*LG2)
This configuration can be modified for a specific application. The following examples describe
the most common applications.
5.2.
Selecting the modem speed
Introduction :
Modem provides two interfaces : the DTE interface connected to the terminal, and the
DCE one to the remote modem. This is described by the following picture of a point to
point connection :
Modem adapts these two interfaces that may work at different rates : these are DTE and DCE
speeds. The DTE speed applies on the terminal interface rate (between the modem and the
terminal) while the DCE speed applies on the line rate (between both modems).
Controlling modem speed
: in default factory configuration, modem is set for automatic mode
also said Autobaud, which satisfies most cases of use. In this case, modem defines the DCE
speed upon the DTE speed which was automatically detected whe the last AT command was
received.
Terminal
Modem
Modem
Terminal
DTE
DCE DCE
DTE
