P p Packet Packet Aggregation Packet Loss Packet Scheduler / Queueing Discipline Packetization Pairing PAP PBX PCM PCR §... ... Periodic Inform PID Ping PLC Traffic Policing PoP Port Port Forwarding Port Speed PPID PPP PPPoA §... ... PPPoE Precedence Prefix delegation Protocol Proxy PSDN PSK PSTN PTM - Pulse-Time Modulation PTM Priority Point-to-Point Tunneling Protocol Top ↑