The Expander is used to expand the capabilities of the Master. This is achieved by cascading Expanders from the DOWN LINK ports of the Master.

Each DOWN LINK Port of a Master is connected to a Level 1 Expander at a site. Many levels of Expanders can be cascaded from the DOWN LINK ports of upper level Expanders. Each Level 1 Expander can be located in a separate site.

The Expander allows all devices connected to its DOWN LINK ports to communicate with all devices on its UP LINK port. The Expanders are the link between the Scanners and the Master thereby allowing the Master to communicate with all the scanners in the system.

The Scanners are connected to the DOWN LINK ports of Expanders. Up to eight Scanners can be connected to each Expander. These Expanders are in turn connected to higher-level Expanders or directly to the Master/Master Expander depending on the site configuration.