ISDN Connection Management
2.2 — IOLINK-PRO & 520 Reference Manual
Auto-Call (Time-of-Day Connections)
An Auto-Call connection is an ISDN connection that is established each time the IOLINK router attempts to
start the link. This starting of the links occurs each time an IOLINK router powers up or when the link goes
through a restart or at the times specified by the Time-of-Day Activation Schedule. An Auto-Call connection
would be used for a static WAN configuration that needs to be maintained at all specified times between sites.
This ISDN connection is made
upon initial power-up and
is maintained during the
times defined in the
time-of-day schedule.
Network B
Network A
Figure 2 - 1 Auto-Call WAN Topology
The semi-permanent connection that results from an Auto-Call configuration means that the IOLINK router
will attempt to maintain a connection to the partner IOLINK router during the times specified in the Time-of-
Day Schedule. When Connection Management is enabled, the ISDN call to the Auto-Call number may be
suspended during periods of inactivity.