ds22-l100-041 Conexant Systems, Inc., ds22-l100-041 Datasheet - Page 19

• Manufacturer Part Number: ds22-l100-041
• Description: Cx84100-41/-23 Scxv.22bis Modem V.22bis Modem With Cx20493 Smartdaa? Line Side Device
• Manufacturer: Conexant Systems, Inc.

2.2.8
2.3
2.3.1
2.3.2
2.3.3
102339C
Automode
Data Mode
Speed Buffering (Normal Mode)
Flow Control
Direct Mode
Automode detection can be enabled by the +MS command to allow the modem to
connect to a remote modem (Table 2-1).
Table 2-1. +MS Command Automode Connectivity
Data mode exists when a telephone line connection has been established between
modems and all handshaking has been completed.
Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed
different than the line speed. The modem supports speed buffering at all line speeds.
DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-to-
modem speed, the modem supports XOFF/XON or RTS/CTS flow control with the DTE
to ensure data integrity.
The Direct mode allows data to be transmitted and received directly from either the DTE
or remote modem. The Direct mode is selected with the AT&Q0 or AT\N1 command.
When running Direct mode, no flow control characters are recognized or transmitted, and
the modem cannot perform error correction. The purpose of the Direct mode is to make
the modem ‘dumb’ for compatibility with older style modems.
Any data received while the modem is in command mode is lost.
V21
V22
V22B
V23C
B103
B212
Notes:
1.
2.
3.
<mod>
CX84100-41/-23 SCXV.22bis Modem Data Sheet
See optional <automode>, <min_rate>, and <max_rate> subparameters for the +MS
command.
For V.23, originating modes transmit at 75 bps and receive at 1200 bps; answering modes
transmit at 1200 bps and receive at 75 bps. The rate is always specified as 1200 bps. V.23
half duplex is not supported.
If the DTE speed is set to less than the maximum supported DCE speed in automode, the
maximum connection speed is limited to the DTE speed.
V.21
V.22
V.22bis
V.23
Bell 103
Bell 212
Modulation
Conexant
300
1200
2400 or 1200
1200
300
1200
Possible Rates (bps) 1
Default
See Note 2
Notes
2-3