MD-21 modem/telephone/ISDN Settings and Configuration

Card Type	Modem
Chip Set	Unidentified
I/O Options	9-pin serial port (RS-232), terminal blocks (3)
Maximum Modem Rate	19.2Kbps
Data Modulation Protocol	ITU-T V.24/V.28
Error Correction/Compression	Unidentified
Data Bus	External

CONNECTIONS
Function	Label	Function	Label
DCE serial port (terminal block)	CN1	Network interface (terminal block)	CN3
Power connector (terminal block)	CN2	9-pin serial port	CN4

INVERTED TRANSMITTER/RECEIVER SELECTION
Setting		S1/1	S1/2
»	Transmitter and receiver normal	Off	Off
	Transmitter inverted, receiver normal	On	Off
	Transmitter normal, receiver inverted	Off	On
	Transmitter and receiver inverted	On	On

RECEIVER ACTIVE/PASSIVE SELECTION
Setting		S3/1	S3/2	S3/3	S3/4	S3/5	S3/6
»	Passive	On	On	Off	Off	Off	Off
	Active	Off	Off	On	On	On	On

TRANSMITTER ACTIVE/PASSIVE SELECTION
Setting		S4/1	S4/2	S4/3	S4/4	S4/5	S4/6
»	Passive	On	On	Off	Off	Off	Off
	Active	Off	Off	On	On	On	On

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Unidentified	On	Power is on
PWR	Unidentified	Off	Power is off
RD	Unidentified	On	Modem is receiving data
RD	Unidentified	Off	Modem is not receiving data
TD	Unidentified	On	Modem is transmitting data
TD	Unidentified	Off	Modem is not transmitting data