ZyXEL Communications 662H Series, 662HW Series 9.10 AT Command Strings, 9.11 DTR Signal, 9.12 Response Strings, 9.13 Configuring Advanced Modem Setup, WAN, Edit, WAN Backup, Advanced Setup, Advanced Setup

	Prestige 662H/HW Series User’s Guide
Table 28 Advanced WAN Backup (continued)
LABEL	DESCRIPTION
Back	Click Back to return to the previous screen.
OK	Click OK to return to the previous screen, then click Apply to save the changes.
Cancel	Click Cancel to begin configuring this screen afresh.

9.10 AT Command Strings

For regular telephone lines, the default "Dial" string tells the modem that the line uses tone dialing. "ATDT" is the command for a switch that requires tone dialing. If your switch requires pulse dialing, change the string to "ATDP".

For ISDN lines, there are many more protocols and operational modes. Please consult the documentation of your TA. You may need additional commands in both "Dial" and "Init" strings.

9.11 DTR Signal

The majority of WAN devices default to hanging up the current call when the DTR (Data Terminal Ready) signal is dropped by the DTE. When the "Drop DTR When Hang Up" check box is selected, the Prestige uses this hardware signal to force the WAN device to hang up, in addition to issuing the drop command "ATH".

9.12 Response Strings

The response strings tell the Prestige the tags, or labels, immediately preceding the various call parameters sent from the WAN device. The response strings have not been standardized; please consult the documentation of your WAN device to find the correct tags.

9.13 Configuring Advanced Modem Setup

To configure settings for your backup WAN modem, click WAN, WAN Backup and then the Advanced Setup button. The Advanced Setup screen displays, click the Edit button to open the Advanced Modem Setup screen as shown next.

Note: Consult the manual of your WAN device connected to your dial backup port for specific AT commands.

Chapter 9 WAN Setup 124