PABX DC5A to AC15A PABX AC15 to DC5A PABX DC5A to Figure 2 (gen-gen) dealer board signalling PABX AC15A to Figure 2 (gen-gen) dealer board signalling Interconnection dealer board Figure 2 (gen-gen) to PABX DC5A Interconnection dealer board Figure 2 (gen-gen) to PABX AC15A Dealer board Figure 2 (gen-gen) to manual E&M signalling Dealer board Figure 2 (gen-gen) to manual 2280Hz signalling