Card Type	T1 CSU/DSU
Chipset	Unidentified
T1 Transfer Rate	1.544Mbps
T1 Protocol	Unidentified
Frame Type	Unidentified
Data Bus	Serial

CONNECTIONS
Function	Label	Function	Label
Monitor receive equalization in jack	CN1	V.35 serial data port 1	CN8
Monitor receive network out jack	CN2	V.35 serial data port 2	CN9
Monitor monitor jack	CN3	V.24 DCE serial control port	CN10
Monitor transmit equalization out jack	CN4	V.24 DTE serial control port	CN11
Monitor transmit network in jack	CN5	AC or DC power in (depends on model)	CN12
Monitor transmit monitor jack	CN6	T1 line out	CN13
Auxiliary jack (see pinout below)	CN7	Alarm cutoff switch	S3

CN1 PINOUT
Function	Pin	Function	Pin
Positive external clock in	1	Not used	6
Negative external clock in	2	Alarm signal common	7
Chassis ground	3	Normally open alarm contact	8
Signal ground	4	Normally closed alarm contact	9
Unbalanced external clock in	5

THUMBWEEL FUNCTION SELECTION
Function	S1	S2	S3
Reset loopback tests	Position 0	Pushed	Not pushed
Begin remote line loopback test	Position 1	Pushed	Not pushed
Unidentified	Position 2	Pushed	Not pushed
Reset to factory defaults and switch settings	Position 3	Pushed for 2 sec.	Pushed for 2 sec.
Unidentified	Position 3	Pushed	Not pushed
Begin near-end line loopback test	Position 4	Pushed	Not pushed
Begin near-end payload loopback test	Position 5	Pushed	Not pushed
Send QRST test code	Position 8	Pushed	Not pushed
Send 3 in 24 test code	Position 9	Pushed	Not pushed
Note:S2 and S3 must always be held for at least one-half of one second for the above functions to take effect.

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
TXD1	Yellow	On	Data port 1 is receiving data from network
TXD1	Yellow	Off	Data port 1 is not receiving data from network
RXD1	Yellow	On	Data port 1 is transmitting data to network
RXD1	Yellow	Off	Data port 1 is not transmitting data to network
CTS1	Yellow	On	Data port 1 CTS is high
CTS1	Yellow	Off	Data port 1 CTS is low
RTS1	Yellow	On	Data port 1 RTS is high
RTS1	Yellow	Off	Data port 1 RTS is low
TXD2	Yellow	On	Data port 2 is receiving data from network
TXD2	Yellow	Off	Data port 2 is not receiving data from network
RXD2	Yellow	On	Data port 2 is transmitting data to network
RXD2	Yellow	Off	Data port 2 is not transmitting data to network
CTS2	Yellow	On	Data port 2 CTS is high
CTS2	Yellow	Off	Data port 2 CTS is low
RTS2	Yellow	On	Data port 2 RTS is high
RTS2	Yellow	Off	Data port 2 RTS is low
DATA	Green	On	Valid data signal detected on T1 interface
DATA	Green	Blinking	Network Set, Reset, or Test code detected on T1 interface
DATA	Green	Off	No valid signal detected on T1 interface
CV	Red	On	Code Violation error detected on T1 interface
CV	Red	Off	Code Violation error not detected on T1 interface
LOS	Red	On	Loss Of Signal condition detected on T1 interface
LOS	Red	Off	Loss Of Signal condition not detected on T1 interface
OOF	Red	On	Signal is out of frame synchronization on T1 interface
OOF	Red	Off	Signal is not out of frame synchronization on T1 interface

DIAGNOSTIC LED(S) (CON’T)
LED	Color	Status	Condition
AIS	Red	On	Alarm Indication Signal condition detected on T1 interface
AIS	Red	Blinking	Alarm Indication Signal being transmitted to T1 interface
AIS	Red	Off	Alarm Indication Signal condition not detected on T1 interface
YEL	Yellow	On	Remote Yellow Alarm condition detected on T1 interface
YEL	Yellow	Blinking	Local Yellow Alarm condition detected on T1 interface
YEL	Yellow	Off	Yellow Alarm condition not detected on T1 interface
PWR	Green	On	Power is on
PWR	Red	On	Self-test failed
PWR	Red	Blinking	Serious problem has occurred
PWR	N/A	Off	Power is off
LOOP	Yellow	On	Local loopback test in progress
LOOP	Yellow	Blinking	Remote loopback test in progress
LOOP	Yellow	Off	Loopback test not in progress
SEND	Yellow	On	Test code being sent
SEND	Yellow	Blinking	Remote loopback test may be in progress but cannot be verified
SEND	Yellow	Off	Test code not being sent
ALM	Red	On	Alarm condition detected and awaiting user intervention
ALM	Green	On	Alarm condition detected; user intervention in progress
ALM	Red	Blinking	Serious problem has occurred
ALM	N/A	Off	Alarm condition not detected