CONNECTIONS
Purpose	Location	Purpose	Location
X.21/G.703	CN1	Digital loopback switch	DIG
AC/DC power	CN2	Analog loopback switch	ANA
Receive fiber	RX	Remote loopback switch	REM
Transmit fiber	TX	Test pattern	PATT

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

BAUD RATE
Setting	SW1
1.544Mbps	0
1.536Mbps	1
768Kbps	2
384Kbps	3
2.048Mbps	4
1.024Mbps	5
512Kbps	6
256Kbps	7
128Kbps	8
» 64Kbps	9
112Kbps	A
56Kbps	B

CD SIGNAL
Setting	JP2
» CD forced high	Pins 1 &2 closed
CD normal	Pins 2 & 3 closed

CHASSIS TO SIGNAL GROUND
Setting	JP5
» Connected	Pins 1 & 2 closed
Disconnected	Pins 2 & 3 closed

CLOCK SOURCE
Setting	JP1/A	JP1/B	JP1/C
External	Closed	Open	Open
» Internal	Open	Closed	Open
Receive	Open	Open	Closed

RANGE
Setting	JP3
Long	Pins 1 & 2 closed
» Short	Pins 2 & 3 closed

REMOTE LOOPBACK
Setting	JP7
Enabled	Pins 1 & 2 closed
» Disabled	Pins 2 & 3 closed

V.54 DELAY
Setting	JP4
» NO	Pins 1 & 2 closed
YES	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