1.4 SpecificationsInstallation Manual 27NoteDevices connected to the Hybrid IP-PBX that exceed the system capacity will not function.MEC Card CalculationCalculate the MEC figure from the type and total number of items of equipment to be connected. If the MECfigure exceeds 28, you need to install an MEC card. Note that you also need to connect an additional ACadaptor in this case.MEC Card CalculationCalculation ExampleThe total MEC figure is 32. As this exceeds 28, you need to install an MEC card for this configuration.AC Adaptor SelectionYou must connect an additional AC adaptor in any of the following conditions:• A total of more than 4 APTs, DPTs (except KX-T7600 series), and DSS consoles (except KX-T7600series) are connected.• More than 4 CSs are connected.• An MEC card is required to support a configuration with a total MEC figure exceeding 28.Equipment Type MEC FigurePT KX-T7600 series DPT/DSS console 1Other DPT/DSS console 1APT 1Pre-installed 4 Super Hybrid Ports 4Extension Card*1*1 Only the extension cards that can support SLTs count for the MEC figures.SLC4 4SLC8 8HLC4 0PLC4 0PLC8 0CS (1 unit) 0VPS (1 port) 1Equipment Type MEC FigurePre-installed Super Hybrid Ports 4 ports 4KX-T7600 series DPT 16 units 16SLC4 2 cards 8VPS 4 ports 4Total 32