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COURIER HIGH SPEED MODEMS
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FRONT PANEL INDICATORS
Symbol
Meaning
Status
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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.
-
AA
Auto Answer
I
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.
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.
MR Modem Ready/
ON when the Courier is powered on.
-
Test Mode
Flashes when the modems retrain, including
online fallback, or while the modem is in Test
mode.
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8-4
Summaries and Tables
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