Chapter 2 Using the Faxmodem
11
Summary of the Indicator Lights
(external modems only)
Light
Description
OH (Off Hook)
Lights when the faxmodem is off hook.
AA
(Auto-Answer)
Blinks on or off when detecting incoming
ring.
RD (Receive Data)
Light flashes when data is sent from the
faxmodem to your computer or other serial
device. At high speeds light may appear on.
TD
(Transmit Data)
Flashes whenever data or commands are
transmitted from the serial port of your
computer or other device to the faxmodem.
TR
(Terminal Ready)
Lights when the computer is ready to send
or receive data. Indicates the status of the
DTR signal from the terminal or computer.
NOTE:
This light does not work on a Mac,
because the Mac uses its control line for
hardware flow control.
CD (Carrier Detect)
Lights when the Data Carrier Detect (DCD)
signal from the faxmodem to the computer
is on.
CS (Clear to Send)
Lights when the faxmodem can accept data
from the computer. The light will turn off
when the faxmodem is set for flow control
(AT command &K3) and the faxmodem’s
data buffer is full, preventing data flow from
the computer.
EC (Error Correction)
Lights when sending data using V.42 or
MNP 4 error correction.
DC (Data Compression)
Lights when using V.42bis or MNP 5 data
compression.
V.34
Lights when operating in V.34 mode.
K56
Lights when communicating in K56Flex™
mode.
FAX
Lights when fax connection has been made
to a remote faxmodem.
MSG
Used by some software products. Lights
when faxes are waiting.
MR
(Modem Ready)
Lights when the faxmodem is turned on.
Flashes when the faxmodem is in self-test
mode.
