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GENERAL
The function of the LCD front panel is to provide easy real-time access
to modem configuration and status. The LCD can be used at any time to
modify modem options or obtain information about modem operation
and status. All of the major options of the modem can be controlled
through the LCD interface without an external terminal or phone line
connection. Operation of the LCD can be secured using a password
protection feature. A remote modem can even be configured using the
local LCD through the use of the front panel remote configuration
feature.
LED DESCRIPTIONS
The V.3400 has six LED indicators: TR, CS, RS, CD, RD, and TD. The
functions of these LEDs are as follows:
TR - Terminal Ready. This LED lights when the DTE asserts Data
Terminal Ready. This signal is input on pin 20 (CCITT V.24/108.2).
CS - Clear to Send. This LED lights when the modem is ready to send
data to the DTE. This signal is output on pin 5 (CCITT V.24/106).
RS - Request to Send. This LED lights when the DTE is ready to send
data to the modem. This signal is input on pin 4 (CCITT V.24/105).
CD - Carrier Detect. This LED lights when the received audio carrier
signal is detected or, if enabled, when error control protocol negotiation
is complete. This signal is output on pin 8 (CCITT V.24/109).
RD - Received Data. This LED lights for a data space condition at the
receive data output, indicating receive data output activity. This signal
is output on pin 3 (CCITT V.24/104).
TD - Transmit Data. This LED lights for a data space condition at the
transmit data input, indicating transmit data input activity. This signal is
input on pin 2 (CCITT V.24/103).
Front Panel Operation
V.3400
Chapter 4
4-1
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