Z0221524AECR50A5T ZILOG [Zilog, Inc.], Z0221524AECR50A5T Datasheet - Page 18

• Manufacturer Part Number: Z0221524AECR50A5T
• Description: Single Chip Modem with Integrated Controller, Data Pump, and Analog Front End
• Manufacturer: ZILOG [Zilog, Inc.]

Operating Modes
PS001907-0904
IDLE
DIALING
HANDSHAKE
The modem controller software features several different states of operation.
Figure 4. Modem State Diagram
When the modem is in the IDLE state it is not communicating with another
modem. The modem accepts AT commands from the terminal while IDLE.
When the modem dials it performs the same tasks a person uses to dial a tele-
phone. The modem does not accept AT commands or data from the terminal while
dialing.
When the modem handshakes it communicates with another modem to determine
the data rate the two modems use to communicate. Handshaking takes place at
the beginning of each connection between two modems. The originator and
answerer of a connection perform different actions while handshaking. The
modem does not accept AT commands or pass data from the terminal while hand-
shaking.
RETRAIN
Single Chip Modem with Integrated Controller, Data Pump, and AFE
COMMAND
DIALING
IDLE
ON-LINE
HANDSHAKE
Operating Modes
Z02215
12