Serial Interface Between a Modem and a Data Multiplexing Box
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
This article describes a serial interface which permits the attachment of a modem to a data multiplexing box through standard V24-type cable and connectors. In microprocessor-based modem having the data multiplexing option, the interface between the modem section and the data multiplexing section is generally comprised of a data bus and control lines. This is efficient when these two sections are located within the same box, but creates electrical and mechanical problems when the data multiplexing section is located in a separate box which may be located a few meters from the modem box. To solve these problems, it is proposed to pass all necessary information between the two boxes through the interchange circuits that are unused during normal operation of the modem.