Card Type

CSU/DSU

Chip Set

Unidentified

Maximum Data Rate

64Kbps

Data Bus

External

Data Modulation Protocol

B8RZ

CONNECTIONS

Function

Label

Function

Label

DC power

CN1

Line out

CN4

RS-232/422

CN2

Power switch

SW3

V.35

CN3

USER CONFIGURABLE SETTINGS

Setting

Label

Position

í CSU/DSU will operate in synchronous mode

SW1/5

On

CSU/DSU will operate in asynchronous mode

SW1/5

Off

í RTS signal forced high

SW1/6

On

RTS signal normal

SW1/6

Off

í DSR signal forced high

SW1/7

On

DSR signal normal

SW1/7

Off

í Local loopback test disabled

SW1/8

On

Local loopback test enabled

SW1/8

Off

í Digital loopback test disabled

SW1/9

On

Digital loopback test enabled

SW1/9

Off

í Remote loopback test disabled

SW1/10

On

Remote loopback test enabled

SW1/10

Off

í Test pattern disabled

SW1/11

On

Test pattern enabled

SW1/11

Off

í Elastic store disabled

SW1/12

On

Elastic store enabled

SW1/12

Off

í 4-wire line is connected

SW2/1

On

2-wire line is connected

SW2/1

Off

í Leased line is connected

SW2/2

On

Switched line is connected

SW2/2

Off

í DTR signal forced high

SW2/3

On

DTR signal normal

SW2/3

Off

í Factory configured - do not alter

SW2/4

N/A

LINE SPEED

Synchronous Mode

Asynchronous Mode

SW1/1

SW1/2

9600bps

9600bps

On

On

19.2Kbps

19.2Kbps

Off

On

í 56Kbps

38.4Kbps

On

Off

64Kbps

57.6Kbps

Off

Off

CLOCK SOURCE

Setting

SW1/3

SW1/4

í Remote

On

On

Internal

Off

Off

External

Off

On

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

SD

Red

On

CSU/DSU is transmitting data

SD

Red

Off

CSU/DSU is not transmitting data

RD

Red

On

CSU/DSU is receiving data

RD

Red

Off

CSU/DSU is not receiving data

CD

Red

On

Carrier signal detected

CD

Red

Off

Carrier signal not detected

CTS

Red

On

CTS signal is high

CTS

Red

Off

CTS signal is low

RTS

Red

On

RTS signal is high

RTS

Red

Off

RTS signal is low

OL

Red

On

Network signal detected

OL

Red

Off

Network signal not detected

TM

Red

On

CSU/DSU is in test mode

TM

Red

Off

CSU/DSU is not in test mode

TM

Red

Blinking

Error detected in test pattern

AUTO-ANSWER

Type:

Register

Format:

AT [cmds] S0=n [cmds]

Description:

Controls when the CSU/DSU will automatically answer an incoming call.

Command

Function

S0=0

Auto-answer disabled.

S0=1

CSU/DSU will always answer incoming calls.

í S0=2

CSU/DSU will answer incoming calls when DTR signal is high.

DATA LENGTH

Type:

Register

Format:

AT [cmds] S12=n [cmds]

Description:

Selects how many data bits will be transmitted.

Command

Function

í S12=0

8 data bits.

S12=1

7 data bits.

DATA PARITY

Type:

Register

Format:

AT [cmds] S14=n [cmds]

Description:

Selects what type of parity bit will be transmitted.

Command

Function

í S14=0

No parity.

S14=1

Even parity.

S14=2

Odd parity.

DATA STOP

Type:

Configuration

Format:

AT [cmds] S13=n [cmds]

Description:

Selects how many stop bits will be transmitted.

Command

Function

í S13=0

1 stop bit.

S13=1

1.5 stop bits.

S13=2

2 stop bits.

DIAL MODE - ASYNCHRONOUS

Type:

Register

Format:

AT [cmds] S15=n [cmds]

Description:

Selects how the CSU/DSU will perform dialing in asynchronous mode.

Command

Function

S15=0

Asynchronous dialing disabled.

S15=1

Dial number in memory location 0 on DTR going high.

í S15=2

AT dialing enabled.

S15=3

Dial number in memory location 0 on DTR going high and AT dialing enabled.

DIAL MODE - SYNCHRONOUS

Type:

Register

Format:

AT [cmds] S2=n [cmds]

Description:

Selects how the CSU/DSU will perform dialing in synchronous mode.

Command

Function

S2=0

Synchronous dialing disabled.

S2=1

Dial number in memory location 0 on DTR going high.

í S2=2

V.25bis dialing enabled.

S2=3

Dial number in memory location 0 on DTR going high and V.25bis dialing enabled.

DSR SIGNAL

Type:

Register

Format:

AT [cmds] S9=n [cmds]

Description:

Controls the behavior of the DSR signal.

Command

Function

í S9=0

DSR forced high.

S9=1

DSR low when off-line or in test mode.

ECHO CANCELLER

Type:

Register

Format:

AT [cmds] S7=n [cmds]

Description:

Controls the echo canceller tone.

Command

Function

í S7=0

Echo canceller tone disabled.

S7=1

Echo canceller tone enabled.

HELP

Type:

Immediate

Format:

AT [cmds] $ [cmds]

Description:

Displays the help screens.

INACTIVITY TIMER

Type:

Register

Format:

AT [cmds] S3=n [cmds]

Description:

Selects how long the line must be inactive for the CSU/DSU to disconnect.

Command

Function

í S3=0

Disconnect on low DTR only.

S3=1

Set inactivity timer to 10 minutes.

S3=2

Set inactivity timer to 30 minutes.

S3=3

Set inactivity timer to 60 minutes.

S3=4

Set inactivity timer to 10 minutes and disconnect on low DTR.

S3=5

Set inactivity timer to 30 minutes and disconnect on low DTR.

S3=6

Set inactivity timer to 60 minutes and disconnect on low DTR.

S3=7

Do not disconnect on inactivity or low DTR.

REDIAL

Type:

Register

Format:

AT [cmds] S1=n [cmds]

Default:

0

Range:

0 - 99

Unit:

1 redial

Description:

Sets how many times the CSU/DSU will attempt to redial a failed call.

REMOTE CONFIGURATION REQUEST

Type:

Register

Format:

AT [cmds] S19=n [cmds]

Description:

Controls requests for remote configuration.

Command

Function

í S19=0

Remote configuration requests denied.

S19=1

Remote configuration requests granted.

RESET

Type:

Immediate

Format:

AT [cmds] *Rn [cmds]

Description:

Resets the CSU/DSU to power-up status.

RTS SIGNAL

Type:

Register

Format:

AT [cmds] S8=n [cmds]

Description:

Controls the behavior of the RTS signal.

Command

Function

í S8=0

RTS forced high.

S8=1

RTS follow CTS.

SYNCH/ASYNCH MODE

Type:

Register

Format:

AT [cmds] S4=n [cmds]

Description:

Selects whether the CSU/DSU is in synchronous or asynchronous mode.

Command

Function

í S4=0

CSU/DSU is in asynchronous mode.

S4=1

CSU/DSU is in synchronous mode.

TRANSMIT PROFILE

Type:

Immediate

Format:

AT [cmds] *Wn [cmds]

Description:

Sends the current S-Register and switch settings to the remote CSU/DSU.

V.25bis FORMAT

Type:

Register

Format:

AT [cmds] S16=n [cmds]

Description:

Selects bit- or byte-oriented dialing for V.25bis mode.

Command

Function

í S16=0

Bit-oriented dialing.

S16=1

Byte-oriented dialing.

DIAL STORED NUMBER

Type:

Immediate

Format:

CRSnn

Description:

Dials the number stored in memory location nn.