User Guide

Appendix D: Modem Settings for RS-232 Dial-up PPP Backup

D-4 Local Management User’s Guide

Courier V.Everything Modem Conﬁguration

Originate (Caller/backup) Side Modem Conﬁguration

The caller side must be conﬁgured for the following:

• DTR off to on transition causes modem to automatically dial previously stored phone number.

• Data mode of operation set to call placed using the asynchronous call establishment command

set. Once the call connection is established switch to synchronous mode for transmission.

• DSR follows/tracks CD.

Use the Extended AT(tention) command set to conﬁgure the modem. Assume the default on all

settings that are not speciﬁed, including DIP switch settings. Use the following list to perform the

conﬁguration:

To verify that the settings have been saved, power down the modem, power it back up, enter the

ATI5 command, then the ATI4 command.

Command Action

The default dialing service setting is pulse. If your dialing service is tone, this

command is set to dial the backup site phone number using tone dial.

&C1 Carrier on after link established (normally the default setting).

&D2 Normal DTR operations. Normally the default setting.

&M1 Selects asynchronous command mode/synchronous data mode.

&R2

Send data to the DTE device on receipt of RTS (normally the default setting). Same

as h/w ﬂow control enabled.

&S4 Simultaneous DSR and CD.

S13=8

Bit 3 on. Enables automatic dialing when DTR off-to-on transition. Auto dials the

number stored in NVRAM at position 0, same as proﬁle zero.

&Z0=nnn

Store the speciﬁed remote phone number including any dial command modiﬁers,

such as the area code in user conﬁguration proﬁle number 1. Up to nine digits can be

entered (n= 0 to 9).

&W Save the above settings.

I5 List the current NVRAM settings to verify the conﬁguration.

I4 List the current non-NVRAM settings to verify the conﬁguration.