Card Type	CSU/DSU
Chip Set	Unidentified
Transfer Rate	56Kbps
Data Bus	External

CONNECTIONS
Function	Label		Function		Label
ENTER button		B1		0 button		B12
UP button		B2		3 and C button		B13
DOWN button		B3		6 and F button		B14
CANCEL button		B4		9 button		B15
1 and A button		B5		# and QUICK button		B16
4 and D button		B6		RS-366 port for dialing		CN1
7 button		B7		RS-232/422 port		CN2
* and SHIFT button		B8		V.35 port		CN3
2 and B button		B9		Line out		CN4
5 and E button		B10		120V AC power		CN5
8 button		B11		Power switch		SW1

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
RS	Green	On	RTS signal is high
RS	Green	Off	RTS signal is low
CS	Green	On	CTS signal is high
CS	Green	Off	CTS signal is low
TD	Green	On	DSU is transmitting data
TD	Green	Off	DSU is not transmitting data
RD	Green	On	DSU is receiving data
RD	Green	Off	DSU is not receiving data
CD	Green	On	Carrier signal detected
CD	Green	Off	Carrier signal not detected
ALM	Red	On	Alarm condition has occurred on CSU
ALM	Red	Off	Alarm condition has not occurred on CSU
TST	Yellow	On	CSU is in test mode
TST	Yellow	Off	CSU is not in test mode

AUTO-ANSWER
Type:	Configuration
Format:	AT [cmds] _Jn [cmds]
Description:	Selects whether the DSU will automatically answer incoming calls.
Command		Function
_J0		Auto-answer disabled.
_J1		Auto-answer enabled.

CD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Description:	Controls the behaviour of the Carrier Detect signal.
Command		Function
&C0		CD forced high.
&C1		CD normal.
&C2		CD forced high except at disconnect.

CLOCK SOURCE
Type:	Configuration
Format:	AT [cmds] &Xn [cmds]
Description:	Sets where the DSU will derive the clock source.
Command		Function
&X0		Internal transmit clock used.
&X1		External ETC clock used.

CTS SIGNAL
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Description:	Controls the behaviour of the Clear to Send signal.
Command		Function
&R0		CTS forced high.
&R1		CTS follows RTS.
&R2		CTS follows CD.
&R3		CTS and RTS follow CD.
&R4		CTS forced high except at disconnect.

CTS DELAY
Type:	Configuration
Format:	AT [cmds] _Dn [cmds]
Description:	Sets the delay from an RTS change to a CTS change.
Command		Function
_D0		Short delay set.
_D1		Long delay set.

DSR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Controls the behaviour of the Data Set Ready signal.
Command		Function
&S0		DSR forced high.
&S1		DSR normal.
&S2		DSR forced high except at disconnect.
&S3		DSR forced high except in test mode.
&S4		DSR forced low in test mode.
&S5		DSR forced high except at disconnect or in test mode.

DTR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Description:	Controls the behaviour of the Data Terminal Ready signal.
Command		Function
&D0		DTR forced high.
&D1		Dial the first stored number in virtual mode on high DTR.
&D2		DTR normal.
&D3		Dial the first stored number on high DTR.
&D4		Dial the second stored number on high DTR.

FRONT PANEL LOCK
Type:	Configuration
Format:	AT [cmds] _Pn [cmds]
Description:	Selects whether the front panel of the DSU is locked.
Command		Function
_P0		Front panel unlocked.
_P1		Front panel locked.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Description:	Selects the type of leased line the DSU is connected to.
Command		Function
&L1		DSU is connected to AT&T line.
&L2		DSU is connected to Sprint line.

LOOPBACK TEST - LOCAL
Type:	Configuration
Format:	AT [cmds] _An [cmds]
Description:	Selects whether the DSU will respond to a request from the DTE for a local loopback test.
Command		Function
_A0		Deny request for local loopback test.
_A1		Grant request for local loopback test.

LOOPBACK TEST - LOCAL
Type:	Configuration
Format:	AT [cmds] _Rn [cmds]
Description:	Selects whether the DSU will respond to a request from the DTE for a remote loopback test.
Command		Function
_R0		Deny request for remote loopback test.
_R1		Grant request for remote loopback test.

LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] %Kn [cmds]
Description:	Sets the speed of operation for the local serial port.
Command		Function
%K1		Set speed to 1200bps.
%K2		Set speed to 2400bps.
%K3		Set speed to 4800bps.
%K4		Set speed to 9600bps.
%K5		Set speed to 19.2Kbps.
%K6		Set speed to 38.4Kbps.
%K7		Set speed to 48Kbps for synchronous mode only.
%K8		Set speed to 56Kbps for synchronous mode, 57.6Kbps for asynchronous mode.
%K9		Set speed to 64Kbps for synchronous mode only.

SERIAL NUMBER SET
Type:	Configuration
Format:	AT [cmds] _S=nn [cmds]
Description:	Sets the DSU’s serial number.

SYNC/ASYNC MODE
Type:	Configuration
Format:	AT [cmds] &Qn [cmds]
Description:	Sets synchronous or asynchronous mode.
Command		Function
&Q0		Use asynchronous mode.
&Q2		Use synchronous mode.

TEST MODES
Type:	Immediate
Format:	AT [cmds] &Tn [cmds]
Description:	Causes the DSU to enter test modes.
Command		Function
&T0		End test in progress.
&T1		Begin local loopback test.
&T4		Grant remote request for remote loopback test.
&T5		Deny remote request for remote loopback test.
&T8		Begin local loopback test with test pattern.
&T9		Begin test pattern.
&T10		Begin local DTE loopback test.
&T11		Begin local DTE and network loopback test.

TEST PATTERN
Type:	Configuration
Format:	AT [cmds] _Tn [cmds]
Description:	Selects which test pattern the DSU will use.
Command		Function
_T0		Use 2047-byte pattern.
_T1		Use 511-byte pattern.

AT COMMAND EXECUTE
Type:	Immediate
Format:	CNLxxx;AT[AT cmds]
Description:	Executes an AT command. The password must be provided if necessary.