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RJ11, DB-9 and Plenum vs PVS This lesson covers the RJ11 connector, which is a bit smaller than an RJ45, it has 6 pins as opposed to 8. An RJ11 is used by standard analogue telephone services. These connectors can carry electricity and power over Ethernet. This lesson also covers DB9 connectors, which are serial port connectors and they allow us to connect devices. DB9s can transmit over an Ethernet cable, making data transmission easier. Participants also learn about Plenum vs PVS connections. Plenum cabling is safer and fire resistant and most buildings needs it in order to pass fire safety inspections.