Enterasys Networks X-PeditionTM manual DTR Dialing for Synchronous Interfaces, Time of Day feature

Asynchronous and Synchronous Support

Table 10-1lists V.25bis options. By default, the synchronous port will use V25bis. The functions of these options are nation-specific, and they may have different implementations. Refer to your modem documentation for a list of supported commands and options.

Table 10-1 ITU-T V.25bis Options

Option	Description
:	Wait tone
<	Pause
=	Separator 3 - national use
>	Separator 4 - national use
P	Dialing to be continued in pulse mode - optional parameter
T	Dialing to be continued in DTMF mode - optional parameter
&	Flash - optional parameter

DTR Dialing for Synchronous Interfaces

Dialer interfaces also support connections from synchronous serial lines through non-V.25bis modems. Routers connected by non-V.25bis modems use data terminal ready (DTR) signaling only, which can be configured in the dialer interface by issuing the dialer dtr command in Interface mode. When using dialer dtr, the dial string is stored in the external device and need not be passed to it.

Time of Day feature

A time of day feature can be configured when you use a dialer interface as a dialed backup line for a primary leased line. When configuring the dialed backup line on the primary interface you can issue the time-rangecommand to connect and disconnect the dial line during the day regardless of traffic on the line or whether the primary line is still down.

Typical Use for Dial Services

Dial services provide WAN connectivity on an economical, as-needed basis, either as a primary link or as backup for a non-dial serial link. Employing dial backup involves setting up a secondary serial interface as a backup to a primary serial interface. Dial services are employed solely for dial backup purposes, as of this release.

Ethernet Backup

Failover support is available on FastEthernet/GigabitEthernet interfaces or sub-interfaces where it is especially beneficial for PPPoE (DSL) redundancy. The backup interface dialer command turns failover “on” while the backup time-rangeand backup delay commands configure intervals to keep the port up or delay bringing it up. See “Configuration for Ethernet Failover” on page 10-40for an example.

XSR User’s Guide 10-3