ADTRAN Express XRT manual Data Terminal Ready, Ring Indicator, = Input O = Output, Modem Interface

Appendix E. Connector Pinouts

			Table E-A
			RS-232 Interface
Pin	Name	I/O	Description
20	DTR	I	Data Terminal Ready
22	RI	O	Ring Indicator
		I = Input O = Output

PIN 1

			PIN 13
			MALE
	PIN 14		PIN 25
			Figure E-2
			Modem Interface
			Table E-B
			Modem Interface
Pin	Name	I/O	Description
1	Shield	I/O	Shield for cable
2	RD	O	Received Data
3	TD	I	Transmitted Data
4	RTS	O	Request to Send
5	CTS	I	Clear to Send
7	SG	I/O	Signal Ground
8	CD	I	Carrier Detect
20	DTR	O	Data Terminal Ready

I = Input O = Output

88 Express XRT User Guide 61202.153L3-1