ROC364 Instruction Manual
4-3 Communications Cards Rev Jun/05
Table 4-1. Communications Card LED Indicators
LED Status and Activity
RXD
The RXD receive data LED blinks when data is being received. The LED is on for a space and off
for a mark.
TXD
The TXD transmit data LED blinks when data is being transmitted. The LED is on for a space and
off for a mark.
DTR
The DTR data terminal ready LED lights when the modem is ready to answer an incoming call.
When DTR goes off, a connected modem disconnects.
DCD The DCD data carrier detect LED lights when a valid carrier tone is detected.
CTS CTS indicates a clear to send message.
RTS The RTS ready to send LED lights when the modem is ready to transmit.
RI The RI is the ring indicator LED light.
DSR The DSR is the data set ready indicator LED light.
OH
The OH is the off hook indicator LED light. A dial tone has been detected and the telephone line is
in use by your modem.
NOTE: The last three LED indicators are used only on the Dial-up modem communications card.
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