Multitech MULTIMODEM MT5600ZDX Owner's Manual page 17

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Chapter 2 - Installation

Off Hook. The condition of Off Hook indicates to the central office that

the MT5600ZDX wants the phone line to do something (i.e., dial or

answer a call). This LED is also lit when the MT5600ZDX has

achieved on-line status.

Terminal Ready. When TR is lit, the MT5600ZDX can answer an

incoming call. This signal (TR or DTR) provides a means for the

terminal or computer to control the MT5600ZDX's connection to the

communications channel. A high DTR signal is required by the

MT5600ZDX to be able to communicate. The state of the TR LED

matches that of the DTR circuit on pin 20 of the RS232/V.24 interface.

Error Correction. This LED is lit when the modem is set for V.42 error

correction, and flashes on and off when data compression is activated.

Fax. This LED is lit when the modem is connected in Fax mode.

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