Appendix G: Peripherals Galaxy Flex Installer Manual236ISDN moduleThe ISDN module is an optional add-on. It connects directly to the RS485 communicationbus, allowing signalling and remote servicing over an ISDN network. The ISDN module ishoused inside the panel enclosure. The ISDN module supports the following features: Full existing telecom module functionality Analogue/digital/X.25 communication Support for existing DTMF, SIA, Contact ID and Microtech signalling formats inaddition to two receiver specific X.25 protocols Hardware and software line snatch Comprehensive line fail detection and reporting Two-way communication using B-Channel and D-ChannelThe ISDN Module is allocated keypad address C, and reports itself as Comm Mod 3.As a result of the addition of the ISDN module, keypad address C is not available. If thiskeypad is required, the ISDN Module should be removed.PROCESSOR12V GND RS485ISDN IN ISDN OUTPROMJP3JumperLinks LEDsD22 D23JP2 JP1Figure 14 ISDN module PCB LayoutThe position of components on the ISDN PCB may vary with different hardware revisions.ProgrammingProgram the module using the ISDN [56.3] menu option.