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HIGH SPEED Modem and FAX FAMILY
CH2056/TBR/ETBR
CH1799/TBR/ETBR
CH1794
FEATURES
•
Supports V.90, V.34bis, V.34, V.32bis, V.32,
V.22bis, V.22A/B, V.23, V.21, Bell 212A and 103.
•
CH2056 supports V.80 Synchronous operation.
•
Error correcting: V.42 LAMP, MNP 2-4 and
MNP10.
•
Data Compression: V.42bis and MNP 5
•
MNP10 Data through put enhancement for cellular
operation.
•
DTE serial interface with speeds up to 230.4kbps
(CH2056), 115.2 (CH1799) or 57.6kbps (CH1794).
•
Automatic baud rate adaptability utilizing speed
sensing, flow control and data buffers.
•
Send & Receive FAX class 1, Group 3 supported.
•
Serial V.24, 5 volt interface.
•
NVRAM directory and stored profiles.
•
AT Command structure, with extensions.
•
Built-in DAA with 1500 VAC RMS isolation 2122V
peak surge protection.
•
UL 1950 and CSA C22.2 950 Recognized
(E104957).
•
Leased Line version available CH1799LL
•
FCC part 68 Approved/DOT CSA CS-03 Part I
Approvable.
•
+5 Volt operation with zero power option
•
Small size: 1.35" x 1.38" x 0.61" (nominal, 0.55"
upon request).
•
Pin compatible with low speed/low cost CH1786
•
TBR21
compliant
CH1799TBR/ETBR and CH2056TBR/ETBR.
INTRODUCTION
The CH2056, CH1799 and CH1794 (HS Modem
Family) are industrial grade high-speed modem
modules. Each HS Modem product supports a range
of modem standards and speeds from 300bps to
14,400bps, 28,800bps, 33,600bps or 57,600bps. By
using built in compression algorithms the operation
speed can be expanded to the maximum DTE rate of
57.6kbps for the CH1794, 115.2kbps for the CH1799
and 230.4kbps for the CH2056. A choice of error
correcting schemes is available including MNP 10 for
cellular telephone applications. The HS Modem family
supports Send and Receive FAX.
operates exclusively on non-voltage bearing leased
–
–
–
versions
available:
The CH1799LL
捷多邦，专业PCB打样工厂，24小时加急出货
V.90 / 57,600bps/TBR21
V.34bis / 33,600bps/TBR21
V.32bis / 14,400bps
The HS Modem family is pin compatible with
Cermetek's low cost CH1786 V.22bis, 2400bps
modem family. Each module in the HS Modem family
is a self-contained modem and is FCC Part 68
approved
and
Canadian
Additionally,
the
CH2056TBR/ETBR products meet the European
TBR21 requirements.
These ultra small modules are designed for PCB
through-hole mounting and are 1.35" x 1.38" x 0.61"
(nominal, 0.55" upon request) in size. The HS Modem
family requires only two external interfaces: a CCITT
V.24 serial interface for direct access to a UART, and
a Tip and Ring RJ-11C Jack for the PSTN line
connection. The HS Modem can be controlled with
industry standard AT commands and is compatible
with available industry communication software.
DESCRIPTION
OF
AND DISCUSSION OF BASIC OPERATIONS
Figure 1 contains a functional block drawing of the HS
Modem family of products. Each HS Modem product
consists
of
a
modulator/demodulator, modem controller with error
correction and data compression, non-volatile RAM
and a DAA.
Figure 1. Functional Block Diagram of HS Modem
Family.
Serial Host Interface Buffer. The HS Modem utilizes
a serial V.24 EIA 232-E 5V interface to control the
modem. The HS Modem products can communicate
over the serial interface with the Data Terminal
DOT
approvable.
CH1799TBR/ETBR
and
FUNCTIONAL BLOCKS
serial
interface
the
buffer,
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Table of Contents
Related Manuals for Cermetek CH1794
Summary of Contents for Cermetek CH1794
- Page 1 Figure 1. Functional Block Diagram of HS Modem speed can be expanded to the maximum DTE rate of Family. 57.6kbps for the CH1794, 115.2kbps for the CH1799 and 230.4kbps for the CH2056. A choice of error correcting schemes is available including MNP 10 for Serial Host Interface Buffer.
-
Page 2: Important Note
This eliminates the need to have external network such as that briefly described in Figure 6A and described in more detail in Cermetek the DTE step up or step down in speed based on the in-coming or out-going PSTN communication data Application Note # 126. -
Page 3: Supported Features
Cermetek Microelectronics, Inc. High Speed Modem and FAX Family CONNECTING TO THE HOST UART Modem is powered down. The internal blocking diode provides supply isolation. Since a modem communicates data serially and most host products handle data in a parallel format, a UART... - Page 4 1. To answer a voice call: utilization. (a) Enter: ATH1<CR> (b) Switch local voice source into T1 Refer to Cermetek Application Note #170, 2-4 Wire (c) Begin Voice Conversation Converter for Use with CH179X and CH2056 Modems,...
-
Page 5: Modem Control
Cermetek Microelectronics, Inc. High Speed Modem and FAX Family 2. To switch to data mode, switch local voice source The escape sequence consists of a “guard time” (a from T1: period where no characters are sent to the modem), (a) At the Originate Modem, enter: ATX1<CR>... -
Page 6: Initializing The Modem
ATZ<CR> command or by the RST pin, the modem will reconfigure to its default state with the line carrier Result: <CR><LF> modulation speed set to: 1. 14.4kbps for the CH1794 <CR><LF> (Verbose) 2. 33.6kbps for the CH1799 3. 57.6kbps for the CH2056 After accepting the AT<CR>... - Page 7 It should be noted that the default connect result codes as outlined in Cermetek Application Note # 126 may 9-20 indicate DTE connection speed, not Carrier Line cause damage to the CH1799LL and will also void DCE speed.
- Page 8 Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Table 3. HS Modem Family Pin Descriptions. NAME FUNCTION RING TELCO/TELSET INPUT. Directly connects to the telephone line’s RING lead through a user supplied RJ-11C jack. TELCO/TELSET INPUT. Directly connects to the telephone line’s TIP lead through a user supplied RJ-11C jack.
-
Page 9: At Command Applications
Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Example: Touch-tone dial 9, pause, go off-hook, AT COMMAND APPLICATIONS return for additional AT commands. Dialing a Phone Number. The Dial command takes Enter: ATDT9, T;<CR> the form Dn, where n is a string of characters. In the Result: OK<CR><LF>... -
Page 10: Fcc Registration
High Speed Modem and FAX Family CANADIAN APPROVALS In addition to restriction notification, the FCC requires that Cermetek make all repairs to all products in the The HS Modem family is approvable for use by DOT to HS Modem family. - Page 11 Serial port flow control enabled = RTS/CTS SPECS XON/XOFF flow control characters selected Prior to delivery, Cermetek installs into each HS Modem the following default Configuration Profile: Note: Upon power-up the HS Modem will recall user profile 0 which may override some of the Default Connect Speeds are 14,400bps, 33,600bps above Factory Defaults.
- Page 12 Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Figure 5. Schematic Illustrating Implementation of Voice Injection Feature. Table 5A. Summary Non-Extended Result Table 5B. CH1799 Extended Result Codes Codes (Continuation). (Continuation). Result Code Form n is ATXn Result Code Form...
- Page 13 Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Table 5C. CH2056 Extended Result Codes Table 6A. Summary Basic Commands (Continuation). (Continuation). Result Code Form n is ATXn Command Function Command Initiate a hang-up sequence Terse Verbose or Long If on-hook, go off-hook and enter...
-
Page 14: Mnp10 Commands
Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Table 6B. Summary of Basic AT Commands. Command Function Command Function Enable both V.42bis and MNP 5 &F0 Restore Factory configuration 0 compression &F1 Restore Factory configuration 1 Set maximum block size in MNP to 64 &G0... - Page 15 Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Table 7. S-Register Summary. Register Function Range Units Saved Default Rings to Auto-Answer 0-255 Rings Ring Counter 0-255 Rings Escape Character 0-255 ASCII Carriage Return Character 0-127 ASCII Line Feed Character...
- Page 16 F1 and F2 in 130 for a list of recommended suppliers. dashed Box #1 must also survive FCC Part 68 surge testing. Refer to Cermetek Application Note C. In most environments, 2 terminal surge #126, Supplemental PSTN Line Protection, for suppressors (300V sidactor or equivalent) are more details.
- Page 17 Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Table 8. HS Modem Electrical Specifications. Symbol Characteristic Min. Typ. Max. Units Positive Supply Voltage Off Hook Nominal Operating Current @ 115.0 (CH1794) = 5.5V when modem is Off Hook Off Hook Nominal Operating Current @ 185.0...
- Page 18 Cermetek Microelectronics, Inc. High Speed Modem and FAX Family Table 10. Analog Characteristics. Name Type Characteristic Value O(DF) Minimum Load 300 Ohms Maximum Capacitive Load 0.01µf Output Impedance 10 Ohms Output Voltage 2.5 ± 1.6V D.C. Offset <20mV Table 11. Summary HS Modem Family of Products.
- Page 19 Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by Cermetek in this publication is believed to be accurate and reliable. However, Cermetek assumes no responsibility for its use, or for any infringements of patents or other rights of third parties resulting from its use.
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