CONNECTIONS
Purpose	Location	Purpose	Location
V.35/X.21/RS-530	CN1	Fuse	FUSE
AC power	CN2	Digital loopback switch	DIG
Ground	GND	Analog loopback switch	ANA
Receive	RCV	Remote loopback switch	REM
Transmit	XMT	Test pattern	PATT

ANALOG LOOPBACK
Setting	JP5
Enabled	Pins 2 & 3 closed
» Disabled	Pins 1 & 2 closed

BAUD RATE
Setting	JP1/A	JP1/B	JP1/C	JP1/D	JP1/E
768Kbps	Closed	Open	Open	Open	Open
512Kbps	Open	Closed	Open	Open	Open
384Kbps	Open	Open	Closed	Open	Open
» 256Kbps	Open	Open	Open	Closed	Open
128Kbps	Open	Open	Open	Open	Closed

CD SIGNAL
Setting	JP3
CD normal	Pins 2 & 3 closed
» CD forced high	Pins 1 & 2 closed

CHASSIS TO SIGNAL GROUND
Setting	JP9
» Connected	Pins 1 & 2 closed
Disconnected	Pins 2 & 3 closed

CLOCK SOURCE
Setting	JP2/A	JP2/B	JP2/C
External	Closed	Open	Open
» Internal	Open	Closed	Open
Receive	Open	Open	Closed

REMOTE LOOPBACK
Setting	JP6
Enabled	Pins 2 & 3 closed
» Disabled	Pins 1 & 2 closed

TRANSMIT LEVEL
Setting	JP4
» 0dBm	Pins 2 & 3 closed
-6dBm	Pins 1 & 2 closed

V.54 DELAY
Setting	JP7
» Off	Pins 1 & 2 closed
On	Pins 2 & 3 closed

X.21 CLOCK SOURCE
Setting	JP8
External	Pins 1 & 2 closed
» Internal	Pins 2 & 3 closed

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Green	On	Power is on
PWR	Green	Off	Power is off
RTS	Yellow	On	Request to Send enabled
RTS	Yellow	Off	Request to Send disabled
TD	Yellow	On	Modem is transmitting steady SPACE
TD	Yellow	Off	Modem is not transmitting data
TD	Yellow	Blinking	Modem is transmitting data
RD	Yellow	On	Modem is receiving steady SPACE
RD	Yellow	Off	Modem is not receiving data
RD	Yellow	Blinking	Modem is receiving data
DCD	Yellow	On	Carrier signal detected
DCD	Yellow	Off	Carrier signal not detected
TEST	Red	On	Modem in test mode
TEST	Red	Off	Modem not in test mode
ERR	Yellow	On	Errors in test pattern
ERR	Yellow	Off	Good test pattern