Layered Systems/Open Architecture:

• abstract syntax
• encapsulation
• expedited data unit
• GOSIP
• high-level control
• intermediate system
• LAP-B
• layer
• layered system
• logical link control (LLC) sublayer
• medium access control (MAC) sublayer
• n-entity
• network termination 1 (NT1)
• network termination 2 (NT2)
• n-user
• open system
• open systems architecture
• Open Systems Interconnection (OSI)
• Open Systems Interconnection (OSI)--architecture
• Open Systems Interconnection (OSI)--Protocol Specification
• Open Systems Interconnection--Reference Model (OSI--RM)
• Open Systems Interconnection (OSI)--Service Definitions
• Open Systems Interconnection (OSI)--Systems Management
• peer entity
• peer group
• physical signaling sublayer (PLS)
• protocol
• protocol-control information
• protocol data unit (PDU)
• protocol hierarchy
• service
• service access point (SAP)
• service data unit (SDU)
• SONET
• standardized profile
• TCP
• TCP/IP
• TCP/IP Suite
• terminal endpoint (TE) functional group
• virtual terminal (VT)
• wrapping