Control Microsystems 5901 - Page 18

5901 High Speed Dialup Modem Hardware Manual
October 19, 2007
17
LED
Color
Function
DSR
Red
The DSR LED is on when the modem is ready to start
communication. It is always in a MARK state (on).
DTR
Red
The DTR LED is on when DTR is asserted by the DTE device.
OH
Red
The OH LED is on when the modem is off hook.