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Chapter 4 - Advanced Data Communications
4-1
Chapter 4 - Advanced Data Communications
This chapter is included as a general reference to the connectors, interfaces,
protocols, and standards used by the Omni 288S, including definitions of many of
the communications-related terms used in this manual.
Front Panel LEDs
The Omni 288 has 13 front panel LEDs. Some LEDs have individual meanings,
while others work in combination to apprise you of your modem’s operating
status. For example, the AA LED is ON when auto-answering is enabled, while
the V34 and V32b LEDs together show the connection mode and speed.
Refer to the following tables for details on the LED status indicators and their
meanings.
LED State Indicates Status
AA ON Modem will automatically answer incoming calls.
OFF Modem will not auto-answer incoming calls.
CD ON Modem has detected a valid carrier signal, or &C0 is set.
OFF No carrier detected.
TXD ON Computer is transmitting data to the modem.
RXD ON Computer is receiving data from the modem.
DTR ON Computer is ready for data communications.
DSR ON Modem is ready for data communications.
RTS ON Computer requests to send data.
CTS ON Modem is ready to accept data for transmission.
EC ON Modem is using V.42 or MNP 4 error correction, or V.42bis
or MNP 5 data compression.
Blinking Data is being re-transmitted.
SQ ON Good signal quality
Flashing Marginal signal quality or error condition at power-up.
OH ON Modem is accessing telephone line.
OFF Model is off-line or not accessing the telephone line.