INTRODUCTION
The CH1787 is a small footprint, full function 2400bps, V.22bis asynchronous modem designed to be used in applications where there is little or no external controller intelligence to command the modem. The CH1787 allows the user to operate the modem via hardware resources only, not requiring AT command execution for basic operation. For those applications where an external controller is available, the CH1787 operates like a standard AT Command driven modem.

FEATURES
• Supports Standards CCITT V.22bis, V.22, Bell 212, and Bell 103
• FCC Part 68 approved and DOC approvable
• Does not require a microprocessor to operate
• Pin activated hang-up
• Pin activated answer
• Manual originate and answer pins
• AT Command structure available
• UL1459 Recognized
• 1000 VAC isolation barrier, 1500V peak isolation
• Single 5 volt operation
• Low power sleep mode
• Automatic adaptive and fixed compromise equalization
• Test modes and diagnostics
• Size: 2.0” X 1.25” X 0.53”
• NVRAM allows storage of custom configurations and telephone numbers
• Commercial operating temperature: 0° to 70°C
• Extended temperature: –40° to 85°C (CH1787ET)