INTRODUCTION
The CH224ATF is a complete FCC Part 68 preapproved, 2400 bps full function modem solution; incorporating an on-board Data Access Arrangement (DAA) in a small footprint, socket-able packaging format (2.5” L x 1.0 W x 0.45” H).

FEATURES
• FCC Part 68 pre-approved
• UL1950, 3rd edition listed
• 1500 Vrms isolation
• Complete solution: on-board DAA
• Data modes
    - CCITT v.22 bis (2400 bps), V.22 (1200 bps)
    - Bell 212A (1200 bps) and 103 (300 bps)
    - Enhanced AT commands
• Group 3 fax modes
    - V.29 (6900/7200 bps) transmit
    - V.27 ter (4800/2400 bps) transmit and receive
    - V.21 Channel 2 (300 bps) transmit and receive
• EIA-578 Service Class 1 commands
• V.42/MNP2-4 and V.42 bis/MNP5 support without additional hardware
• Data/fax discriminator and auto answering
• Communications software compatible
• Serial asynchronous DTE interface
• NVRAM interface allows storage of two user configurations and four 36-digit dial strings
• Automatic adaptive/ fixed compromise equalization
• Programmable sleep mode
• Full-duplex data mode test capabilities: Analog loop, local digital loop, and remote digital loop
• Half-duplex fax mode test capabilities
• Automatic format/speed sensing
• Low power consumption (typical):