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PRO SWITCHING SYSTEM
If an alarm is generated or restored to normal in a rack at a dialup site, and the site
is off-line, the dialup site dials the central PC.
When the connection is established, the dialup site comes online. The PC
responds to the connection by polling the dialup site and obtaining information
about current status and configuration. Then, the PC disconnects the dialup site.
2.4.3 P
OLLING
P
ROCEDURES
Generally, racks on dedicated ports are polled individually by the PC. However, if a
switching/monitoring screen for the rack is displayed, this rack is polled more
frequently in order to acquire “real-time” information about it for display on the
screen.
2.5 System Expansion
The Pro Switching System is flexible and modular. You can begin with a small local
system—a rack and a few cards. As your needs grow, you can add more cards and
racks to create a large site; then add more sites to create a global network. You can
incorporate new functions and interfaces as they come into use.