2 Installation ManualSystem ComponentsAbbreviations in this manualProprietary Telephone: PTSingle Line Telephone: SLTDirect Station Selection: DSSCompatible Proprietary Telephones• KX-T7700, KX-T7300, and KX-T7000 series PTs• KX-T7710 SLT• KX-T7740, KX-T7340, and KX-T7040 DSS ConsolesFor the equipment that can be connected to the PBX, refer to "1.2.2 System Connection Diagram".NoticeCertain models may not be available in your country/area.Certain PTs and features may not be available in your country/area. Consult your certifiedPanasonic dealer for more information.System Components TableModel DescriptionMain Unit KX-TEA308 Advanced Hybrid System: 3 Outside (CO) Lines, 8 HybridExtensionsKX-TEB308 Advanced Hybrid System: 3 Outside (CO) Lines, 4 Hybridand 4 SLT Extensions *1*1 Taiwan: 4 PT ExtensionsFor supported extension types, refer to "2.5.1 Connecting Extensions".Optional Service Cards KX-TE82460 2-Port Doorphone CardKX-TE82492 2-Channel Voice Message Card (for KX-TEA308 only)KX-TE82493 3-Port Caller ID CardProprietary Equipment KX-T30865 DoorphoneKX-A227 Backup Battery Cable