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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.