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COURIER HIGH SPEED MODEMS
Summaries and Tables B-5
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.