CH224ATF(1999) Просмотр технического описания (PDF) - Cermetek Microelectronics
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CH224ATF Datasheet PDF : 14 Pages
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PRELIMINARY
CH224ATF
PART NUMBER ORDERING INFORMATION
Part Number
CH224ATF
Description
Data/Fax modem module with TTL serial interface, on-board DAA, 0.310” pins
TECHNICAL SPECIFICATIONS
General
The CH224ATF modem is a full-featured, self-
contained data/fax solution. External micro-
controller for data or fax control functions are fully
supported and controlled through the AT command
set.
Operation
Modem operation is controlled by AT commands
(Table 2), fax service class 1 commands (Table
3), and supporting S registers (Table 4). Result
codes and messages are listed in Table 5.
Data Modes: Data rate selection is determined
by the speed of the originating and answering
modems:
Data modes perform complete handshake and data
rate negotiations. All tone and pattern detection
required by the applicable CCITT or Bell standard
are supported.
Originate Modem Connect Speed Based on Answer
Rate (bps)
Modem Rate (bps)
300
1200 2400
Fax modes support Group 3 fax requirements. Fax
300
data and fax control (V.21 300 bps) performed by
1200
the modem is controlled and monitored through the
fax EIA-578 Class 1 insertion/deletion, and CRC
2400
generation/checking is provided.
300
1200
1200
300
300
1200 1200
1200 2400
Both transmit and receive fax data is buffered
within the modem. Data transfer to and from the
DTE is flow controlled by XON/XOFF.
Configurations and Rates
The supported modem configurations and
signaling rates are listed in Table 1. In data modes
with serial interface selected, DTE rate offsets of
+1%, -2.5% are accommodated by adding/deleting
stop bits are required. In fax modes, the DTE rate
is 19200 bps.
Fax Modes: Fax modes are negotiated as
defined in T.30 and are implemented by AT+F
commands. The AT+FCLASS=1 command
causes entry into the fax mode from the data
mode. Most other fax class 1 commands, which
start with the AT+F prefix, are valid only in the
fax mode. All data commands are valid in the fax
mode except A/, On & Tn, and the escape
sequence (+++). The AT+FCLASS=0 command
terminates the fax mode and causes entry into the
data mode.
Configuration
Modulation
Table 1. Configurations and Rates
Transmitter Carrier Data Rate
Baud
Frequency (Hz) +0.01% (bps)
(Symbols/Sec.)
Bits Per
Symbol
Constellation
Points
Data Mode
Answer
Originate
V.22
QAM
2400
1200
2400
600
4
16
V.22
DPSK
2400
1200
1200
600
2
4
Bell 212A
DPSK
2400
1200
1200
600
2
4
Bell 103
FSK
2225
1270 M
300
300
1
1
2025 S
1070 S
Fax Mode
Receive
Transmit
V.29
QAM
N/A
1700
9600
2400
4
16
V.22
DPSK
N/A
1700
7200
2400
3
8
Bell 212A
DPSK
1800
1800
4800
1600
3
8
Bell 103
FSK
1800
1800
2400
1200
2
4
1650 M
1650 M
300
300
1
1
1850 S
1850 S
Notes:
Legend:
QAM = Quadrature Amplitude Modulation
DPSK = Differential Phase Shift Keying
FSK = Frequency Shift Keying
M = Mark Condition
S = Space Condition
N/A = Not Applicable
©1999 Cermetek Microelectronics, Inc.
2
Document No. 607-0005 Rev.A (11/99)
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