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- O
- OAM - Operations and Management
- OCD - out-of-cell Delineation (UNI 3.0 Section 2.1.2.2.2)
- OSPF - Open Shortest Path First
- P
- Packet Switching
- PCR - Peak Cell Rate (UNI 3.0)
- PDU - 1.Protocol Data Unit; 2.Power Distribution Unit
- PE - Provider Equipment
- PGL - Peer Group Leader (ATM Forum, PNNI)
- PHP - 1.Penultimate Hop Pop; 2. Hypertext Preprocessor scripting language
- Physical Layer
- PLCP - Physical Layer Convergence Procedure/Protocol (IEEE 802.6)
- PL-OU - Physical Layer Overhead Unit (UNI physical layer frame definition)
- Plesiochronous
- PMD - Physical Media Dependent
- PMP - Point to Multipoint (UNI 3.0)
- PNNI - Private Network-to-Network Interface
- POH - Path Overhead (SONET)
- POI - Path Overhead Indicator
- POS - Packet Over Sonet
- Point-to-Point
- PPP - Point to Point Protocol
- PSTN - Public Switched Telephone Network
- PT - Payload Type
- PTE - Path Terminating Equipment (SONET)
- PTI - Payload Type Identifier
- PTSE - PNNI Topology State Element (ATM Forum, PNNI)
- PTSP _ PNNI Topology State Packet
- PVC - Permanent Virtual Circuit
- Q
- Q.2931 - ITU Signaling Standard
- QOS - Quality of Service
- R
- RDI - Remote Defect Indicator (UNI Fault Management)
- RFC - Request For Comments
- RM Cell - Resource Management Cell
- RSFG - Route Server Functional Group (ATM Forum, MPOA SWG)
- RSVP - Reservation Protocol
- RT-VBR - realtime Variable Bit Rate Service
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