nalling Link (part of SS7) MTP L3 Message Transfer Part, Layer 3 ITU-T Q.704. Signalling Network Functions and Messages (part of SS7) Next Generation Network Denotes the evolution direction of today's public networks Network Information Center See www.iana.org N-ISDN Narrowband ISDN (normally integrated with PSTN) ITU-T 1.120, ISDN General Structure, and many other recommendations in the I.- and Q.-series Operation and Maintenance Administration Part ITU-T M.3010, Principles for Telecommunications Management Network ITU-T Q.756, Guidebook to OMAP OMAP is an abstract protocol that relies on the message protocol defined by Object Management Group See www.omg.org/ OSI RM Open Systems Interconnection Reference Model ITU-T X.200, Reference Model of Open Systems Interconnection Optical Transport Network ITU-T G.872. Architecture of Optical Transport Networks Point-to-Point Protocol IETF RFC 1661 updated by RFC 2153 Primary Rate Access ITU-T I.431, Primary Rate User-Network Interface-Layer 1 Specification Packet Switching Public Switched Telephony Network. This concept refers circuit-switching networks with analog accesses (normally integrated with N-ISDN) Request For Comment Real-Time Object-Oriented Modeling See Selic (1994) Remote Operation Service Element ITU-T X.219 describes the service. The protocol is describe in ITU-T X.229 Reliable Transfer Service Element ITU-T X.X.218, describes the service. The protocol is describe in ITU-T X.228 Signaling ATM Adaptation Layer ITU-T Q.2100. B-ISDN Signaling ATM Adaptation Layer Overview Description. Signaling Connection Control Part (part of SS7) ITU-T Q.700-716 Synchronous Digital Hierarchy ITU-T G.803, Architecture of Transport Networks Based on the Synchronous Digital Hierarchy. Describes SDH functional structure according to ITU-T G.805. See also other standards in the G.800-899 series Specification and Description Language ITU-TZ.100, CCITT Specification and Description Language (SDL) Structure of Management Information RFC 1902, Structure of Management Information for