ZyXEL Communications ZyWALL 2 Plus - Manual (Page 168)

Chapter 8 WAN Screens
ZyWALL 2 Plus User’s Guide
168
8.11 Advanced Modem Setup
8.11.1 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.
8.11.2 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 ZyWALL uses this hardware signal to force the WAN device to hang up, in
addition to issuing the drop command ATH.
Enable Multicast Select this check box to turn on IGMP (Internet Group Multicast Protocol). IGMP
is a network-layer protocol used to establish membership in a Multicast group - it
is not used to carry user data.
Multicast Version Select IGMP-v1 or IGMP-v2. IGMP version 2 (RFC 2236) is an improvement
over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If you would
like to read more detailed information about interoperability between IGMP
version 2 and version 1, please see sections 4 and 5 of RFC 2236.
Budget
Always On Select this check box to have the dial backup connection on all of the time.
Configure Budget Select this check box to have the dial backup connection on during the time that
you select.
Allocated Budget Type the amount of time (in minutes) that the dial backup connection can be
used during the time configured in the Period field. Set an amount that is less
than the time period configured in the Period field.
Period Type the time period (in hours) for how often the budget should be reset. For
example, to allow calls to this remote node for a maximum of 10 minutes every
hour, set the Allocated Budget to 10 (minutes) and the Period to 1 (hour).
Idle Timeout Type the number of seconds of idle time (when there is no traffic from the
ZyWALL to the remote node) for the ZyWALL to wait before it automatically
disconnects the dial backup connection. This option applies only when the
ZyWALL initiates the call. The dial backup connection never times out if you set
this field to "0" (it is the same as selecting Always On).
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to begin configuring this screen afresh.
Table 36 NETWORK > WAN > Dial Backup (continued)
LABEL DESCRIPTION