media gateway

1. A protocol converter that interfaces a traditional public switched telephone network (PSTN), or device running PSTN protocols, with a device running the Internet protocol (IP) suite. 2. A small IPBX system sized for small business enterprise (SBE) applications up to a dozen or so extensions,

74570c13.qxd 9/11/07 12:25 PM Page 305

• positive intrinsic negative (PIN)
• Postel, Jon (1943–1998)
• Postel’s Law
• Post Office Code Standardization Advisory Group (POCSAG)
• Post Office Protocol (POP)
• Post, Telegraph, and Telephone (PTT)
• potential
• POT (Point Of Termination)
• POTS (Plain Old Telephone Service)
• pound sign
• power back-off
• power density
• powered device (PD)
• power failure cut-through
• power failure transfer
• powerline carrier (PLC)
• power over Ethernet (PoE)
• power (P)
• power sourcing equipment (PSE)
• p-persistent carrier sense multiple access (P-Persistent CSMA)
• P-Persistent CSMA (P-Persistent Carrier Sense Multiple Access)
• P-phone (Proprietary phone)
• P-phone (Proprietary phone)
• PPO (Private Paging Operator)
• PPO (Private Paging Operator)