User's Manual
V34bis Fax-modem - AJ 2885 P
AJ 2885 P - Page 40
7.2.2. Answering a Call
When the modem is set in answer mode, it will go off hook after 2 rings (if the command
ATS0=2 is sent). This is in conformity with CCITT V25bis recommendation.
7.2.3. Connection - Disconnection
In calling mode, the modem will automatically recognize the remote modem modulation type
and adapt correspondingly.
It will disconnect only if:
•
The carrier is lost,
•
No carrier tone is detected within 35 to 90 seconds,
•
No data activity has occurred for the selected period of time dictated by the Inactivity Timer.
7.3. Serial
interface
The V24 serial interface of the modem conforms to the DCE specifications. A straight ribbon
cable is all that is needed to connect to the DTE port of your computer or terminal. The serial
port will automatically recognize DTE speeds up to 115200 bps. This is called auto-bauding.
Both asynchronous and synchronous (except FSK : V21, V23) modes with internal or external
clock are supported.
7.4. Fax-mode
7.4.1. Automatic Call and Answer
See 5-2
7.4.2. Transmission
Modes
The modem provides the ability to send and receive faxes at speeds up to 9600 bps.
The following modulations are supported:
ITU-T
Speed Bps
Carrier (Hz)
V21
300
1650 – 1850
V27 ter
2400 / 4800
1800
V29
7200 / 9600
1700
V17
12000 / 14400
1700
7.4.3. Operating
Mode
In fax mode, the modem support the following standards:
•
Group III Fax, EIA 578 class 1 and class 2 compatible,
•
CCITT T4 - T30 recommendations.
7.4.4. Service Class 1 Command Set
The following AT commands control the operation of a class 1 modem/fax:
+FCLASS
Service class identification and control
+FTS
Stop transmission and wait
+FRS
Receive silence
+FTM
Transmit mode
+FRM
Receive mode
+FTH
Transmit T30 command mode
