CONNECTIONS
Purpose	Location	Purpose	Location
V.24/V.35/X.21	CN1	Diagnostic test switch	DIG
AC power	CN2	Analog loopback switch	ANA
Ground	GND	Remote loopback switch	REM
Receive	RCV	Test pattern	PATT
Transmit	XMT

ANALOG LOOPBACK
Setting	JP4
» Enabled	Pins 1 & 2 closed
Disabled	Pins 2 & 3 closed

BAUD RATE
Setting	SW1
144Kbps	0
72Kbps	1
112Kbps	2
56Kbps	3
128Kbps	4
» 64Kbps	5
96Kbps	6
48Kbps	7

CD SENSITIVITY
Setting	JP5
» High	Pins 2 & 3 closed
Low	Pins 1 & 2 closed

CD SIGNAL
Setting	JP6
CD normal	Pins 2 & 3 closed
» CD forced high	Pins 1 & 2 closed

CHASSIS TO SIGNAL GROUND
Setting	JP8
» Connected	Pins 1 & 2 closed
Disconnected	Pins 2 & 3 closed

CLOCK SOURCE
Setting	SW2/A	SW2/B	SW2/C
» Internal	On	Off	Off
External	Off	On	Off
Receive	Off	Off	On

ENABLE TOGGLE SWTICH
Setting	JP1
» DIG, ANA, REM, PATT enabled	Pins 1 & 2 closed
Disabled	Pins 2 & 3 closed

RECEIVE IMPEDANCE
Setting	JP13
» 150omhs	Pins 2 & 3 closed
High	Pins 1 & 2 closed

RECEIVE LEVEL
Setting	JP12
» 0dBm	Pins 1 & 2 closed
-6dBm	Pins 2 & 3 closed

REMOTE LOOPBACK
Setting	JP3
» Enabled	Pins 2 & 3 closed
Disabled	Pins 1 & 2 closed

REMOTE POWER FAILURE
Setting	JP10
» Transmit RPF tone	Pins 1 & 2 closed
Doesn’t transmit RPF tone	Pins 2 & 3 closed

RTS/CTS DELAY
Setting	JP7
» 8ms	Pins 1 & 2 closed
70ms	Pins 2 & 3 closed

TRANSMIT IMPEDANCE
Setting	JP11
» 150omhs	Pins 1 & 2 closed
Low	Pins 2 & 3 closed

TRANSMIT LEVEL
Setting	JP9
» 0dBm	Pins 1 & 2 closed
-6dBm	Pins 2 & 3 closed

V.54 DELAY
Setting	JP2
» On	Pins 1 & 2 closed
Off	Pins 2 & 3 closed

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Green	On	Power is on
PWR	Green	Off	Power is off
RTS	Green	On	Request to Send enabled
RTS	Green	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