USRobotics V.34 user manual Front Panel Indicators, Symbol Meaning Status

COURIER HIGH SPEED MODEMS

If you decide to build your own cable, use a low-capacitance cable. To further minimize the capacitance, connect only those functions (pins) that your application requires.

FRONT PANEL INDICATORS

Symbol	Meaning	Status
HS	High Speed	All calls above 2400 bps: ON during call
		progress, after completion of dialing; OFF
		during HST-mode link negotiations at 2400
		bps, then ON during connection. Remains ON
		after disconnect until next call is originated or
		answered, or the modem is reset.
AA	Auto Answer/	Answer mode only: ON when your modem is
	Answer	in Auto Answer mode, and when answering a
		call; in HST-mode, goes OFF if the channel is
		reversed and your answering modem trans-
		mits at 450 or 300 bps. Also goes OFF when
		the modem originates a call. Flashes ON for
		incoming ring detect.
CD	Carrier Detect	ON if DIP switch 6 is OFF (factory setting) and
		the Courier receives a valid data signal
		(carrier) from a remote modem, indicating that
		data transmission is possible. Also ON when
		the CD override is on, DIP switch 6 ON.
OH	Off Hook	ON when the Courier takes control of the
		phone line to establish a data link.
RD	Received Data	Flashes when the modem sends result codes or
		passes received data bits to the computer or
		terminal.
SD	Send Data	Flashes when the computer or terminal sends
		a data bit to the Courier.
TR	Data Terminal	ON if DIP switch 1 is OFF (factory setting) and
	Ready	the modem receives a DTR signal from the
		computer or terminal. Also ON when the
		DTR override is on, DIP switch 1 ON.

Summaries and Tables B-5