Installation Installing Modules274.4.1 SlotsThe OpenCom 510 1-12 frame can house up to:■ 2 power supply units■ 1 control module■ 12 interface cards (trunk or subscriber modules) split into 2 separate groups.The following slots are provided for installing these modules:Each of the two groups (1 or 2, or C and D, respectively, in the illustration) requiresits own power supply unit. Power for the control module is always supplied by thegroup 1 power supply unit. The group 1 power supply unit must therefore alwaysbe installed.Modules can be installed either when the entire system is configured or as anupgrade at a later time.LegendA Slot for group 1 power supply unitB Slot for group 2 power supply unit0 Slot for central control moduleC Slots for group 1 interface cards (slots 1 - 6)D Slots for group 2 interface cards (slots 7 - 12)
