应用笔记 4980

Using the Teridian 73M2901CE in 4-Wire and Leased Line Applications

By: Jeff Sorensen

摘要 : The Teridian 73M2901CE single-chip, low-speed modem includes an enhanced leased line mode, energy ring detection, and short message service (SMS) support. Leased line mode allows modems to connect without some of the restrictions and timeouts that are required for dial-up operation. It also allows modems to remain active when they are disconnected or the carrier is lost. Most modems have modulation modes that allow full duplex communication over two wires, but some, such as Bell 202T and V.23 FDX modems, require four wires for transmission and reception. This application note focuses on how to use the 73M2901CE in leased line and 2-/4-wire applications.