Card Type	E1 CSU/DSU
Chip Set	Unidentified
I/O Options	DC power connector, 25-pin connector (RS-530), E1 network interface via RJ-48 connector, BNC connectors (2)
Wiring Type	RJ-48 120ohm shielded twisted pair BNC 75ohm coaxial
E1 Transfer Rate	2.048Mbps
E1 Protocol	HDB3
Frame type	256N, 256S
Data Bus	External

CONNECTIONS
Function	Label	Function	Label
Analog loopback activation push-button	ANA	ATE connector (maintenance only)	J1
Alarm clear push-button	CLR	Test pattern activation push-button	PATT
DC power connector	CN1	Remote digital loopback activation push-button	REM
DTE/DCE serial port (25-pin connector)	CN2	BNC connector - receive	RX
Network interface via RJ-48 connector	CN3	BNC connector - transmit	TX
Digital loopback activation push-button	DIG	Power switch	SW2

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Front panel switches enabled	JP2	Pins 1 & 2 closed
	Front panel switches disabled	JP2	Pins 2 & 3 closed
»	Watchdog enabled	JP5	Pins 1 & 2 closed
	Watchdog disabled	JP5	Pins 2 & 3 closed
»	Debug self test mode disabled	JP7	Pins 2 & 3 closed
	Debug self test mode enabled	JP7	Pins 1 & 2 closed
»	Phantom power feeding is disabled	JP19	Open
	Phantom power feeding is enabled	JP19	Closed
»	Signal ground is connected to the frame ground	JP23	Pins 2 & 3 closed
	Signal ground is not connected to the frame ground	JP23	Pins 1 & 2 closed
»	E1 interface not referenced to frame ground	JP26	Open
	E1 interface referenced to frame ground	JP26	Closed
»	E1 interface receive signal not referenced to frame ground	JP27	Open
	E1 interface receive signal referenced to frame ground	JP27	Closed
»	E1 interface transmit signal not referenced to frame ground	JP32	Open
	E1 interface transmit signal referenced to frame ground	JP32	Closed
»	Unbalanced network interface not grounded	JP204	Open
	Unbalanced network interface grounded	JP204	Closed
»	CTS forced high	S7/3	On
	CTS follows remote RTS	S7/3	Off
»	Fast synchronization timing (1 sec)	S7/4	Off
	AT&T TR-62411 synchronization timing (10 sec)	S7/4	On
»	256S multiframe mode enabled	S7/5	Off
	256N multiframe mode enabled	S7/5	On
»	TS16 is reserved	S7/6	Off
	TS16 is enabled to carry user's data	S7/6	On
»	CRC-4 enabled	S7/7	Off
	CRC-4 disabled	S7/7	On
»	Factory configured - do not alter	S7/8	Unidentified
»	Nx64 mode	S11/1	Off
	Nx56 mode	S11/1	On
»	Internal clock mode enabled	S11/2	Off
	Loopback timing mode enabled	S11/2	On
»	Time slot allocation is sequential, starting from slot 1	S11/3	On
	Data is inserted in alternate time slots, starting from slot 1	S11/3	Off
»	Factory configured - do not alter	S11/4	Unidentified

BAUD RATE
Setting	S6	S9
Unframed	0	0
Operational baud rate set to 1x64	0	1
Operational baud rate set to 2x64	0	2
Operational baud rate set to 3x64	0	3
Operational baud rate set to 4x64	0	4
Operational baud rate set to 26x64	2	6
Operational baud rate set to 27x64	2	7
Operational baud rate set to 28x64	2	8
Operational baud rate set to 29x64	2	9
Operational baud rate set to 30x64	3	0
Note: Multiples of 56Kbps or 64Kbps, up to 30 may be selected, for a maximum of 1680Kbps for multiples of 56Kbps or a maximum of 1920Kbps for multiples of 64Kbps. 31-99 are not used.

DTE INTERFACE
Function	J2	J3	J4	J5
V.35 DTE interface	Open	Open	Board connected	Board connected
RS-422 interface	Board connected	Board connected	Open	Open

MAIN LINK INTERFACE
Function		JP12	JP13	JP20/A	JP20/B	JP20/C	JP20/D
»	Balanced interface	1 & 2	1 & 2	Open	Open	Closed	Open
	Unbalanced interface	1 & 2	1 & 2	Closed	Open	Open	Open
Note: Pins designated are in the closed position

IDLE CODE
Setting		S8/1	S8/2	S8/3	S8/4	S8/5	S8/6	S8/7	S8/8
»	Default idle code	Off	Off	Off	Off	Off	Off	Off	Off
Note: On=0, Off=1. Switch S8/1 is the most significant bit. Switch S8/2 is the least significant bit. Values are currently unidentified.

SERIAL COMMUNICATION
Setting		JP16	JP17
»	Serial communication for maintenance purposes enabled	Pins 1 & 2 closed	Pins 1 & 2 closed
	Reserved	Pins 2 & 3 closed	Pins 2 & 3 closed

PORT TIMING
Setting		S7/1	S7/2
	DTE1 port timing	On	On
»	DCE port timing	On	Off
	DTE2 port timing	Off	On
	Not used	Off	Off

E1 TRANSMIT LEVEL SELECTION
Net build		Label	Position
»	0dBm	S12	0
	-7.5dBm	S12	1
	-15dBm	S12	2
	-22.5dBm	S12	3

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Unidentified	On	Power is on
PWR	Unidentified	Off	Power is off
RTS	Unidentified	On	RTS input line is on
RTS	Unidentified	Off	RTS input line is off
TST	Unidentified	On	Device is conducting a test
TST	Unidentified	Off	Device is not conducting a test
ERR	Unidentified	On	Error detected in the test pattern
ERR	Unidentified	Off	Error not detected in the test pattern
LOC	Unidentified	On	Synchronization lost on local FCD-2L
LOC	Unidentified	Off	Synchronization not lost on local FCD-2L
REM	Unidentified	On	Synchronization lost on remote FCD-2L
REM	Unidentified	Off	Synchronization not lost on remote FCD-2L
10	Unidentified	On	BER on the network link exceeds 10
10	Unidentified	Off	BER on the network link does not exceed 10
MIN	Unidentified	On	Minor alarm condition detected. Remains lit until fault condition disappears, or CLR button is pushed
MIN	Unidentified	Off	Minor alarm condition not detected
MAJ	Unidentified	On	Major alarm condition detected. Remains lit until fault condition disappears, or CLR button is pushed
MAJ	Unidentified	Off	Major alarm condition not detected