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Chapter 3
LEDs and Controls
his chapter describes the LEDs and controls on the modem.
Front Panel LEDs
Table 3-1 describes the LEDs on the modem front panel.
Table 3-1. Front Panel LEDs
LED Status
PWR
ON = power is being supplied to the modem.
TM
ON = the rotary switch is turned to Analog or Digital
Loopback, or the switch is in the Test Pattern transmit
mode or Self Test mode and no error is detected.
CD
ON = the modem is detecting a valid carrier.
RD
ON = data is being received or receive data line is in a
space condition.
RS
ON = the Request-to-Send line from the DTE is ON.
CS
ON = the Clear-to-Send line from the modem is ON.
TD
ON = data to be transmitted is being furnished to the
modem.
T