Card Type	Serial/T1 CSU/DSU
Chip Set	Hitachi HD64570
Maximum Onboard Memory	256KB DRAM
T1 Transfer Rate	1.554Mbps
Data Bus	16-bit ISA

CONNECTIONS
Function	Label	Function	Label
T1 line	CN1	RS-232, RS-422/449, RS-530, or V.35 port	CN2

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Current ceiling enabled	J5	Unidentified
	Current ceiling disabled	J5	Unidentified
»	Factory configured - do not alter	S1/7	Unidentified
»	Factory configured - do not alter	S1/8	Unidentified

INTERRUPT

J1 is used to set the interrupt. Exact settings are unidentified. Interrupts 3, 4, 5, 9, 10, 11, 12, and 15 are available.

BASE I/O ADDRESS
Setting		SW1/1	SW1/2	SW1/3	SW1/4	SW1/5	SW1/6
	100h	On	On	On	On	Off	On
	110h	Off	On	On	On	Off	On
	120h	On	Off	On	On	Off	On
	130h	Off	Off	On	On	Off	On
	140h	On	On	Off	On	Off	On
»	300h	On	On	On	On	Off	Off
	3B0h	Off	Off	On	Off	Off	Off
	3C0h	On	On	Off	Off	Off	Off
	3D0h	Off	On	Off	Off	Off	Off
	3E0h	On	Off	Off	Off	Off	Off
	3F0h	Off	Off	Off	Off	Off	Off
Note: A total of 48 base address settings are available. The switches are a binary representation of the decimal memory addresses. SW1/6 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/6=512, SW1/5=256, SW1/4=128, SW1/3=64, SW1/2=32, SW1/1=16. Turn off the switches and add the values of the switches to obtain the correct memory address. (Off=1, On=0)

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
LED1	Red	On	Network connection is broken
LED1	Red	Off	Network connection is good
LED2	Red	On	Frame error has been detected
LED2	Red	Off	Frame error has not been detected
LED3	Yellow	On	Card is in loopback mode
LED3	Yellow	Off	Card is not in loopback mode
LED4	Green	Blinking	Card processor is functioning normally
LED4	Green	Off	Card processor is not functioning normally