Chapter 2 - Installation
17
OH
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.
TR
Terminal Ready. When TR is lit, the MT5600ZDX can answer an
incoming call. This signal (TR or DTR) provides a meansfor 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.
EC
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.
FX
Fax. This LED is lit when the modem is connected in Fax mode.
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