Elk M1 Data Bus HubFor easy connection of expanders & keypads. The M1DBH accepts up to 9, RJ45 equipped CAT5 or CAT6 cables, and the series connects the data A & B lines so that the data bus may be terminated properly. Two or more units may be interconnected if more than 9 data lines are required. Product Features: Designed For Multiple Home Run Cables Internally Connects Data A & B Lines From Previous Device Into Next Device Out Provides up to Nine (9) Data Bus