User`s guide

138 XSR User’s Guide
Asynchronous and Synchronous Support Chapter 8
Configuring Dialer Services
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-range command
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-range and backup delay commands configure intervals to
keep the port up or delay bringing it up. See “Configuration for Ethernet
Failover” on page 186 for an example.
T Dialing to be continued in DTMF mode - optional parameter
& Flash - optional parameter
Table 8 ITU-T V.25bis Options (Continued)
Option Description