ZyXEL U-336R User Guide - Page 22
Front Panel LEDs
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Figure 2-2 U-336SA Front Panel Front Panel LEDs PWR Power ON indicator, loghts up when your modem is turned ON. OH Off-Hook indicator, lights up when your modem is in data mode or off-hook. It goes out when your modem is in talk mode or on-hook. AA Auto-Answer indicator, lights up when your modem is in the Auto Answer Mode; flashes when modem rings. In error control mode, it flashes when retransmitting. DTR Data Terminal Ready indicator, lights up when your DTE or computer indicates that it is ready to begin communication. DSR DTE mode: Data Set Ready Indicator, lights up when the modem is ready for communication. TXD Transmit indicator, ON when your DTE/computer transmits data on the serial port. RXD Receive indicator, ON when your DTE/computer receives data on the serial port. CD Carrier Detect indicator; lights up when a valid carrier is detected present on the line. RTS DTE mode: Request To Send indicator; indicates the signal status of RS232 signal RTS from DTE. RTS is used for hardware flow control in asynchronous data transmission. 8 Installation