DSU III DBU modem/telephone/ISDN Settings and Configuration

Card Type	Dial Backup DSU
Chip Set	Unidentified
I/O Options	25-pin DTE ports (2), V.35 DTE port, dial backup port (RJ-48), dedicated network port (RJ-48), power
Maximum Data Rate	64Kbps
ISDN Rate	64Kbps
ISDN Modulation Protocol	HDLC, PPP
Line Coding	2B1Q
Data Bus	External

CONNECTIONS
Function	Label		Function		Label
Dedicated network port - line 1		CN1		V.35 DTE port		CN5
Dial backup port - line 2		CN2		Power		CN6
25-pin DTE port - auxiliary		CN3		Power switch		SW1
25-pin DTE port - primary		CN4

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
RS	Unidentified	On	RTS signal high
RS	Unidentified	Off	RTS signal low
CS	Unidentified	On	CTS signal high
CS	Unidentified	Off	CTS signal low
TD	Unidentified	On	Data is being transmitting from DTE
TD	Unidentified	Off	Data is not being transmitting from DTE
RD	Unidentified	On	Data is being received from network
RD	Unidentified	Off	Data is not being received from network
CD	Unidentified	On	Frame synchronization is established. Device is ready to transmit/receive data
CD	Unidentified	Off	Frame synchronization is not established. Device is not ready to transmit/receive data
ALM	Unidentified	On	Open loop, loss of frame synchronization, dial backup mode, or problem with dial backup line alarm condition detected on network
ALM	Unidentified	Off	Open loop, loss of frame synchronization, dial backup mode, or problem with dial backup line alarm condition not detected on network
TST	Unidentified	On	Device is conducting a test
TST	Unidentified	Off	Device is not conducting a test

SUPPORTED COMMAND SET

Basic AT Commands

AT, A/

A, E, H, O, Q, V

&C, &D, &F, &K, &L, &Q, &R, &S, &V,&X, &Z

Extended AT Commands

\N, \T

%A, %C,

Note: See MHI Help File for full command documentation.

NON-STANDARD COMMAND SET

Basic AT Commands

Z

Extended AT Commands

%B, %K, %P, %P=x, %P>x, %R, %T

_A, _B, _C, _D, _E, _F, _G, _H, _I, _J, _K, _L, _N=xx, _P, _RR, _S=x, _T, _X, _Y

Note: Full documentation is unavailable for non-standard AT commands

TEST MODES
Type:	Immediate
Format:	AT [cmds] &Tn
Description:	Selects test options
Command	Function
&T0	End current test
&T1	Begin local analog loopback test
&T3	Begin local digital loopback
&T6	Request remote digital loopback
&T7	Request remote digital loopback and self-test
&T8	Begin local analog loopback and self-test
&T9	Begin local self-test
&T10	Begin local DTE and anolog loopback test
&T11	Begin local analog loopback test

TEST PATTERNS
Type:	Immediate
Format:	AT [cmds] _Tn
Description:	Selects test pattern options
Command	Function
_T0	Begin test using 2047 pattern
_T1	Begin test using 511 pattern
_T2	Begin stress test using pattern #1
_T3	Begin stress test using pattern #2
_T4	Begin stress test using pattern #3
_T5	Begin stress test using pattern #4
Note: Commands must be used in conjuction with T7 or T8 to select analog or remote test pattern.