Card Type	E1 CSU/DSU
Chip Set	Unidentified
I/O Options	AC power connector, 25-pin port (RS-530), BNC connectors (2), 9-pin serial ports (2 RS-232), E1 network interface via RJ-45 connector
E1 Transfer Rate	2.048Kbps
E1 Protocol	HDB3
Frame type	CRC-4
Data Bus	External

CONNECTIONS
Function	Label	Function	Label
AC power connector	CN1	Header connector to CH2 interface board	CN8
DTE serial port	CN2	Header connector to CH2 interface board	CN9
25-pin connector - channel 1	CN3	DCE serial port	CN10
Network port via RJ-48 connector	CN4	Power switch	SW2
Header connector to sub interface board	CN5	BNC connector - receive	RX
Header connector to CH2 interface board	CN6	BNC connector - transmit	TX
Header connector to CH2 interface board	CN7

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
15-pin connector - channel 1	CN11

CONNECTIONS
Function	Label
34-pin connector - channel 1	CN12

MISCELLANEOUS TECHNICAL NOTE

CN11 and CN12 are modules which can be used to replace CN3, allowing for various DTE/DCE interfaces.