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Modem Type

Data (synchronous/asynchronous)/Fax

Maximum Data Rate

2400bps

Maximum Fax Rate

9600bps

Data Bus

External

Fax Class

Class I & II

Data Modulation Protocol

ITU-T V.21, V.22, V.22bis, V.23

Fax Modulation Protocol

Unidentified

Error Correction/Compression

MNP5, MNP10, V.42, V.42bis

CONNECTIONS

Purpose

Location

Purpose

Location

Line out

CN1

RS-232/422

CN4

Line in

CN2

Power switch

SW1

DC power

CN3

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

HS

Red

On

Modem is operating at 2400bps

HS

Red

Off

Modem is operating at less than 2400bps

AA

Red

On

Auto answer enabled

AA

Red

Off

Auto answer disabled

CD

Red

On

Carrier signal detected

CD

Red

Off

Carrier signal not detected

OH

Red

On

Modem is off-hook

OH

Red

Off

Modem is on-hook

RD

Red

On

Modem is receiving data

RD

Red

Off

Modem is not receiving data

SD

Red

On

Modem is transmitting data

SD

Red

Off

Modem is not transmitting data

TR

Red

On

DTR signal is high

TR

Red

Off

DTR signal is low

TM

Red

Blinking

Test mode enabled

TM

Red

Off

Test mode disabled

BIT-MAPPED REGISTER S14

Format

AT [cmds] S14=n [cmds]

Example:

ATS14=139<CR>

Default:

171

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls echo, quiet mode, result codes, dial mode, and originate/answer mode.

Bit

Function

0

Not used.

1

Command echo function enabled.

2

Result code sending enabled.

3

Verbose format enabled.

4

Not used.

5

Pulse dialing mode enabled.

6

Result codes disabled in answer mode.

7

Originate mode enabled.

BIT-MAPPED REGISTER S21

Format

AT [cmds] S21=n [cmds]

Example:

ATS21=1<CR>

Default:

0

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls low DTR action, DCD signal, and the Long Space Disconnect function.

Bit

Function

0

Not used.

1

Restore profile 1 on power-up.

2

Not used.

4, 3

Modem is initialized on low DTR.

5

DCD signal normal.

6

DSR signal normal.

7

Long Space Disconnect function enabled.

BIT-MAPPED REGISTER S22

Format

AT [cmds] S22=n [cmds]

Example:

ATS22=114<CR>

Default:

118

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls volume and speaker settings, result codes, and make/break pulse ratio.

Bit

Function

1, 0

Highest volume setting.

3, 2

Speaker enabled following dialing, then disabled after carrier signal detected.

6, 5 ,4

Busy and dialtone detection enabled, result codes 0-7, 10 enabled.

7

33/67ms pulse ratio at 10pps (Europe)

BIT-MAPPED REGISTER S23

Format

AT [cmds] S23=n [cmds]

Example:

ATS23=114<CR>

Default:

0, read-only (see note)

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls guard tones. Also indicates detected serial port speed and parity. Also provides storage for remote digital loopback tests.

Note:

All bits except bits 6 and 7 are read-only.

Bit

Function

0

1

Remote digital loopback response enabled.

3, 2, 1

Local speed detected at 9600bps.

5, 4

11

No parity detected.

7, 6

1800Hz guard tone enabled.

BIT-MAPPED REGISTER S27

Format

AT [cmds] S27=n [cmds]

Example:

ATS27=77<CR>

Default:

73

Range:

0 - 255

Unit:

Bit-mapped

Description:

Controls communications mode, line type, and protocol type.

Note:

Be aware that bits 2 and 3 are out of order.

Bit

Function

3, 1, 0

110

Asynchronous mode, serial port speed locked.

2

Select leased line.

5, 4

10

DTE generates clock

6

Select Bell protocols.

7

Not used.

COMPRESSION

Type:

Register

Format:

AT [cmds] S41=n [cmds]

Example:

AT S41=1<CR>

Description:

Selects data compression.

Function

Data compression disabled.

Data compression enabled.

COMPRESSION MODE

Type:

Configuration

Format:

AT #Ln

Example:

AT #L2 -K1 <CR>

Description:

Selects active compression protocols.

Function

Compression disabled.

MNP compression only enabled.

V.42bis compression only enabled.

MNP and V.42bis compression enabled.

FLOW CONTROL

Type:

Configuration

Format:

AT [cmds] \Gn [cmds]

Example:

AT \G1 &K3<CR>

Description:

Selects flow control.

Function

Flow control disabled.

Flow control enabled.

INACTIVITY TIMER

Type:

Configuration

Format:

AT [cmds] \Tn [cmds]

Example:

AT\T20<CR>

Default:

0

Range:

0-42

Unit:

1 minute

Description:

Sets the length of time that the modem does not receive information before it disconnects.

LOOPBACK TESTS

Format

AT [cmds] S16=n [cmds]

Example:

ATS16=32<CR>

Default:

0

Range:

0 - 255

Unit:

Bit-mapped

Description:

Enables loopback tests.

Note:

Bit 3 is read-only.

Bit

Function

0

Local analog loopback test enabled.

1

Not used.

2

Local digital loopback test enabled.

3

Modem is performing remote digital loopback test.

4

Remote digital loopback test enabled.

5

Remote digital loopback with local self-test enabled.

6

Local analog loopback with local self-test enabled.

7

Not used.

MNP10 COMPRESSION

Type:

Configuration

Format:

AT [cmds] -Kn [cmds]

Example:

AT %C1 -K1 -Q0 <CR>

Description:

Selects MNP10 data compression.

Function

MNP10 disabled.

MNP10 enabled.