User`s guide

Modem 3600
4-1
Chapter 4
Front Panel Operation
The liquid-crystal display (LCD) front panel provides easy real-time
access to modem configuration and status. You can use the LCD at any
time to modify modem options or to get information about modem
operation and status. All of the major modem options 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 Modem 3600 LED indicator functions are as follows:
• TR (Terminal Ready). TR lights when the DTE asserts Data
Terminal Ready. This signal is input on pin 20 (CCITT V.24/108.2).
• CS (Clear to Send). CS 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). RS 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). CD 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). RD 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) TD 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).