System OutlineInstallation Manual 311.4 Service Cards Description1.4.1 Extension CardsHybrid Line Circuit (HLC) Card (KX-T96170);This card interfaces Analog Proprietary Telephones (APTs)/Single Line Telephones (SLTs)/DSS Consoles and the TDM (Time Division Method) bus. It provides 8 APTs/SLTs/DSSConsoles to the system per HLC card.Proprietary Line Circuit (PLC) Card (KX-T96172);This card interfaces Analog Proprietary Telephones (APTs)/DSS Consoles and the TDM bus.It provides 8 APTs/DSS Consoles to the system per PLC card.Single Line Telephone Circuit (SLC) Card (KX-T96174);This card interfaces Single Line Telephones (SLTs) and the TDM bus. It provides 8 SLTs tothe system per SLC card.SLC with Message Waiting (SLC-M) Card (KX-T96175);This card is the same as the standard SLC card and except that it has the capability to turn on/off the message waiting lamp of an SLT.Off Premise Extension (OPX) Card (KX-T96185);This card interfaces 4 off premise extensions through off premise extension power unit.Digital Hybrid Line Circuit (DHLC) Card (KX-TD50170);This card interfaces Digital Proprietary Telephones (DPTs)/Analog Proprietary Telephones(APTs)/Single Line Telephones (SLTs)/DSS Consoles and the TDM bus. It provides 8 DPTs/APTs/SLTs/DSS Consoles to the system per DHLC card.Digital Proprietary Line Circuit (DLC) Card (KX-TD50172);This card interfaces Digital Proprietary Telephones (DPTs)/DSS Consoles and the TDM bus.It provides 16 DPTs/DSS Consoles to the system per DLC card.