Card Type	CSU/DSU
Chip Set	Unidentified
I/O Options	AC power connector, 25-pin connectors (2 RS-530), BNC connectors (4) 9-pin serial ports (2 RS-232), E1 network interface via RJ-48 connectors (4)
E1 Transfer Rate	2.048Kbps
E1 Protocol	HDB3
Frame type	CRC-4
Data Bus	External

CONNECTIONS
Function	Label	Function	Label
AC power connector	CN1	DCE serial port	CN10
DTE serial port	CN2	Sub network port via RJ-48 connector	CN11
Channel 1 port (25-pin connector)	CN3	Main network port via RJ-48 connector	CN12
Channel 2 port (25-pin connector)	CN4	BNC connector - unbalanced receive in	RXIN
Header connector to sub link interface board	CN5	BNC connector - unbalanced receive out	RXOUT
Header connector to CH2 interface board	CN6	BNC connector - unbalanced transmit in	TXIN
Header connector to CH2 interface board	CN7	BNC connector - unbalanced transmit out	TXOUT
Header connector to CH2 interface board	CN8	Power switch	SW2
Header connector to CH2 interface board	CN9

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Signal ground is connected to the frame ground	JP8	Closed
	Signal ground is not connected to the frame ground	JP8	Open
»	Transmit side ground reference set for balanced interface	JP9	Open
	Transmit side ground reference set for unbalanced interface	JP9	Closed
»	Receive side ground reference set for balanced interface	JP10	Open
	Receive side ground reference set for unbalanced interface	JP10	Closed
»	Front panel push-buttons enabled	JP77	Open
	Front panel push-buttons disabled	JP77	Closed
»	Supervisor ports operate according to user-defined parameters	S1/1	Off
	CSU/DSU uses default parameters stored in its EPROM	S1/1	On
»	Default password enabled. Password=RAD	S1/2	On
	User password enabled	S1/2	Off
»	Loads user-selected parameters from NVRAM on power-up	S1/3	Off
	Loads default parameters stored in its EPROM on power-up	S1/3	On
»	Factory configured - do not alter	S1/4	Off

MAIN LINK INTERFACE
Function		JP7	JP12/A	JP12/B	JP12/C	JP12/D	JP33	JP35
»	Balanced interface	Open	Open	Closed	Open	Open	2 & 3	2 & 3
	Unbalanced interface	Closed	Open	Open	Open	Closed	1 & 2	1 & 2
Note: Pins designated are in the closed position

ALARM RELAY
Function		JP51	JP52
»	Alarm relay disconnected. DTE port (CN2) provides full functionality	2 & 3	2 & 3
	Alarm relay connected instead of DCD and CTS lines	1 & 2	1 & 2
Note: Pins designated are in the closed position

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
LOC1	Unidentified	On	Local synchronization lost on main link
LOC1	Unidentified	Off	Local synchronization OK on main link
REM1	Unidentified	On	Remote synchronization lost on main link
REM1	Unidentified	Off	Remote synchronization OK on main link
LOC2	Unidentified	On	Local synchronization lost on sub link
LOC2	Unidentified	Off	Local synchronization OK on sub link
REM2	Unidentified	On	Remote synchronization lost on sub link
REM2	Unidentified	Off	Remote synchronization OK on sub link
ALM	Unidentified	On	Alarm condition detected on network
ALM	Unidentified	Off	Alarm condition not detected on network
TST	Unidentified	On	Device loopback test active
TST	Unidentified	Off	Device loopback test not running

CONNECTIONS
Function	Label	Function	Label
Header connector to mainboard	CN14	Line side protection fuse	F3
Line side protection fuse	F1	Line side protection fuse	F4
Line side protection fuse	F2

SUB LINK INTERFACE
Function		J9	JP12/A	JP12/B	JP12/C	JP12/D	JP16	JP17
»	Balanced interface	Open	Open	Closed	Open	Open	2 & 3	2 & 3
	Unbalanced interface	Closed	Open	Open	Open	Closed	1 & 2	1 & 2
Note: Pins designated are in the closed position

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Transmit side ground reference set for balanced interface	JP8	Open
	Transmit side ground reference set for unbalanced interface	JP8	Closed
»	Receive side ground reference set for balanced interface	JP10	Open
	Receive side ground reference set for unbalanced interface	JP10	Closed

CONNECTIONS
Function	Label	Function	Label
Header connector to mainboard	CN15	Header connector to mainboard	CN17
Header connector to mainboard	CN16	Header connector to mainboard	CN18