Chapter 8; Synchronous Mode Operation; Mode Options; Table 8-1 Synchronous Mode Options - ZyXEL Communications U-90E User Manual

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.
.
AT-Command Description
AT&M1 SYNC DATA
AT&M3 SYNC

Synchronous Mode Operation

Synchronous Mode Operation

Table 8-1 Synchronous Mode Options

Function
The modem accepts asynchronous command at command
state, but exchanges data synchronously at data state
The mode accepts synchronous command (V.25bis) at
command state, and also exchanges data synchronously at
data state.
U-90E Data/Fax Modem

Chapter 8

8-1