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Technical Information

Application Notes

General Modem References:

 —  "AT" Commands & S-Registers
110 Manual Originate and/or Answer Operation of Cermetek Modem Module
115 Conveyed FCC Part 68 Approval
116 Operation of Cermetek Leased Line Modem Module
120 Overview of Basic Problems Encountered with PSTN Lines That Can Adversely Affect DAA and Modem Operations
125 Part 68 Plug/Jack Attestation List
126 Supplemental PSTN Line Protectin
127 Telecommunication Compliance Consultants
128 Serial Port Overruns
130 Summary of Recommended Suppliers
148 Procedure to Convert Between Decimal, Hexadecimal and ASCII Formats
160 Using PROCOMM with CH2124/60
171 Decreasing CH1794 Handshake Time
174 Caller ID Feature for CH1786A, CH1794A and CH2056A Modems
175 Surge Protection Guidelines and Recommendations
177 Off-Hook Detection Using AT Commands
179 Using MS Windows Hyper Terminal with Modem Products
Detailed step-by-step procedures to set-up and control iModem functions using MS Windows HyperTerminal accessory program; numerous examples provided to query and verify successful data transmission.

Internet Modem References:

150 General Operation of Cermetek iModem Products
Hardware overview of iModem operation, includes functional block diagrams, brief description of software configuration and operation in typical evaluation platform.
155 @T® Command Set Description and Usage for CH2124/60 iModem Products
Detailed description of special Internet Modem queries and set-up commands; command structure table and step-by-step tutorial examples.
156 CH2124/60 iModem Default Configuration Profile
Detailed description and structure of default ISP configuration profile.
157 Using MS Windows Hyper Terminal with iModem Products
Detailed step-by-step procedures to set-up and control iModem functions using MS Windows HyperTerminal accessory program; numerous examples provided to query and verify successful data transmission.
158 Cermetek iModem Caveats and Definitions
Suggestions that help avoid common problems relating to hardware or command set-up problems.
159 Using iNetWizard® with CH2124/60
Complete technical manual, which documents use of convenient special iNetWizard set-up disk, which is provided for easy set-up, profile configuration, and verification of the iModem.
163 Recommendations for Improved iModem Internet Connectivity
Quick method to improve message transfer reliability through reduction in iModem transmission speed for installations that may be connected to a noisy PSTN dial-out line.
325 @T Command Set Description and Usage for CH2165 iModem
Detailed description of special Internet Modem queries and set-up commands; command structure table and step-by-step tutorial examples.
327 CH2165 iModem Default Configuration Profile
Detailed description and structure of default ISP configuration profile.

Modem/DAA Usage:

113 Solutions to Dialing Pagers Using Modems
114 Simulating an Active/Wet PSTN 2-Wire Line and Connecting Two Modems
129 911 Emergency Interrupt Circuit for CH1786 Modem Modules
133 Using the CH1786 DAA to Perform DTMF Functions Via An External DTMF Transceiver
137 Implementing a DTMF Modem Front End Using Cermetek DAA's
138 Limiting Current on PSTN Lines
146 CH2056 V.80 Support Details Using V.80 for Synchronous Data Communication with the RC56D Modem
147 Description of New AT +MS Command Implementation for CH179X and CH2056 Products
165 CH1798 and CH1799 Products: Known Incompatibilities Between pre-1 August 2000 and post -1 August 2000 Products
166 Recommendations for Upgrading from CH1786 to CH179X/CH2056 Modems
170 2-4 Wire Converter for Use with CH179x and CH2056 Modems
178 Improved Modem Cellular Operations

Reference Note:

104 United States PSTN Central Office Nominal Parameter Values
 
105 Comparative Features and Benefits Review: Internet Modems versus Standard Analog Modems.