U-90E
Data/Fax
Modem
Synchronous Mode Operation
8-1
Chapter 8
Synchronous Mode Operation
This chapter introduces you to the use of U-90E modem for synchronous operation. Use
the modem as a synchronous modem when it is connected to a synchronous computer or
terminal. Make sure that the remote modem and system are also set to synchronous.
Synchronous mode applies to the entire non-FSK mode except V.90 supplied with the
modem.
8.1 Mode
options
For synchronous data communication, there are two options you can choose from to
define how the modem should operate at the command state.
Table 8-1 Synchronous Mode Options
.
AT-Command
Description
Function
AT&M1
SYNC DATA
The modem accepts asynchronous command at command
state, but exchanges data synchronously at data state
AT&M3
SYNC
The mode accepts synchronous command (V.25bis) at
command state, and also exchanges data synchronously at
data state.
