Card Type	E1 LTU
Chip Set	Unidentified
I/O Options	AC power connector, V.35 DTE port, serial port, E1 network interface via 15-pin connector, BNC connectors (2)
E1 Transfer Rate	2.048Mbps
E1 Protocol	HDB3
Frame Type	CRC-4
Data Bus	External

CONNECTIONS
Function	Label	Function	Label
AC power connector	CN1	LTU board connector	J3
Serial port	CN2	LTU board connector	J4
34-pin V.35 DTE port	CN3	Power switch	SW2
15-pin E1 port	CN4	BNC connector - receive	RX
LTU board connector	J2	BNC connector - transmit	TX
Note: Jumpers must be installed on pins 1&2 and 3&4 of connectors J3 & J4 to maintain signal path continuity when the LTU board is removed.

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Debug self test mode disabled	JP2	Pins 1 & 2 closed
	Debug self test mode enabled	JP2	Pins 2 & 3 closed
»	Default password enabled. Password=FCD-12	JP3	Pins 2 & 3 closed
	User password enabled	JP3	Pins 1 & 2 closed
»	Watchdog timer enabled	JP4	Pins 1 & 2 closed
	Watchdog timer disabled	JP4	Pins 2 & 3 closed
»	Signal ground is connected to the frame ground	JP12	Pins 2 & 3 closed
	Signal ground is not connected to the frame ground	JP12	Pins 1 & 2 closed
»	Internal -5V enabled	JP22	Pins 1 & 2 closed
	Grounded to pin 15 in the main link connector (CN4)	JP22	Pins 2 & 3 closed
»	Transmit side ground reference set for balanced interface	JP23	Open
	Transmit side ground reference set for unbalanced interface	JP23	Closed
»	Frame ground is connected to main link ground reference	JP24	Closed
	Frame ground is not connected to main link ground reference	JP24	Open
»	Allows connection of the line controlled by JP22 to pin 15 of main link connector (CN4) for powering external device	JP25	Closed
	Does not allow connection of the line controlled by JP22 to pin 15 of main link connector (CN4) for powering external device	JP25	Open
»	Allows connection of internal +5V, via resistor, to pin 14 of main link connector (CN4) for powering external device	JP26	Closed
	Does not allow connection of internal +5V, via resistor, to pin 14 of main link connector (CN4) for powering external device	JP26	Open
»	Receive side ground reference set for balanced interface	JP27	Open
	Receive side ground reference set for unbalanced interface	JP27	Closed

TERMINATION
Function		JP18	JP19	JP20	JP21
»	Balanced interface compatibility enabled	Pins 1 & 2	Pins 1 & 2	Pins 1 & 2	Pins 1 & 2
	Unbalanced interface compatibility enabled	Pins 2 & 3	Pins 2 & 3	Pins 2 & 3	Pins 2 & 3
Note: Pins designated are in the closed position

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
RTS	Unidentified	On	Control input line in V.35 DTE port is high
RTS	Unidentified	Off	Control input line in V.35 DTE port is low
DCD	Unidentified	On	Indication output line in V.35 DTE port is high
DCD	Unidentified	Off	Indication output line in V.35 DTE port is low
TD	Unidentified	On	Device is detecting pulses from the local DTE
TD	Unidentified	Off	Device is not detecting pulses from the local DTE
RD	Unidentified	On	Device is receiving pulses from network
RD	Unidentified	Off	Device is not receiving pulses from network
LOC	Unidentified	On	Local synchronization lost
LOC	Unidentified	Off	Local synchronization OK
REM	Unidentified	On	Remote synchronization lost
REM	Unidentified	Off	Remote synchronization OK
TST	Unidentified	On	Device loopback test active
TST	Unidentified	Off	device loopback test not running

CONNECTIONS
Function	Label	Function	Label
Mainboard connector	J5	Mainboard connector	J7
Mainboard connector	J6

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Factory configured - do not alter	JP5	Open
»	Factory configured - do not alter	JP6	Open

E1 OUTPUT LEVEL SELECTIO
Net build		Label	Position
»	0dB	SW1	1
	-7.5dB	SW1	2
	-15dB	SW1	3