H.225.0 An ITU standard that governs H.225.0 session establishment and packetization. H.225.0 actually describes several different protocols: RAS, use of Q.931, and use of RTP. H.245 An ITU standard that governs H.245 endpoint control. H.320 Suite of ITU-T standard specifications for videoconferencing over circuit-switched media, such as ISDN, fractional T-1, and switched-56 lines. Extension of […]
[Continue reading]Most Common Networking Terms and Acronyms – G
G.703/G.704 ITU-T electrical and mechanical specifications for connections between telephone company equipment and DTE using BNC connectors and operating at E1 data rates. G.711 Describes the 64-kbps PCM voice coding technique. In G.711, encoded voice is already in the correct format for digital voice delivery in the PSTN or through PBXs. Described in the ITU-T […]
[Continue reading]Most Common Networking Terms and Acronyms – F
Fast Ethernet Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase 10 times that of the 10BaseT Ethernet specification while preserving such qualities as frame format, MAC mechanisms, and MTU. Such similarities allow the use of existing 10BaseT applications and network management tools on Fast Ethernet networks. Based on an […]
[Continue reading]Most Common Networking Terms and Acronyms – E
E1 Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 2.048 Mbps. E1 lines can be leased for private use from common carriers. Compare with T1. E3 Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 34.368 Mbps. E3 lines can be leased […]
[Continue reading]Most Common Networking Terms and Acronyms – D
D channel Data channel. Full-duplex, 16-kbps (BRI), or 64-kbps (PRI) ISDN channel. Compare with B channel. datagram Logical grouping of information sent as a network layer unit over a transmission medium without prior establishment of a virtual circuit. IP datagrams are the primary information units in the Internet. The terms cell, frame, message, packet, and […]
[Continue reading]OSI Layer 7: Application Layer
The Application Layer is the one which interacts with the user. A Software application that implements a communicating component, uses the OSI Application Layer to establish the application’s communication. For example a word processor that does not have communications capabilities, would not be concerned with the OSI Application Layer. On the other hand, an application […]
[Continue reading]OSI Layer 6: Presentation Layer
The main function of this layer is to define data formats, coding, and conversion functions that are applied to application layer data. These functions ensure that information sent from the application layer of one system would be readable by the application layer of another system. Encryption and compression of Data are also defined as Presentation […]
[Continue reading]OSI Layer 5: Session Layer
The Session Layer starts, controls, and manages communication conversations (sessions). Communication sessions consist of service requests and service responses that occur between applications located in different network devices. These requests and responses are coordinated by protocols implemented at the session layer. The session layer creates ways to imply which flows are part of the same […]
[Continue reading]OSI Layer 4: Transport Layer
The Transport Layer (e.g TCP) provides reliable delivery of Data by using error checking, acknowledgments, flow control, and sequence checking. Multiplexing of incoming data for different flows to applications on the same host (for example, TCP ports) is also performed. Flow control in this layer ensures that the transmitting device does not send more data […]
[Continue reading]OSI Layer 3: Network Layer
This Layer defines logical addressing (e.g IP address) in order to identify each endpoint in a network and provide end-to-end delivery of packets. Think of the Network Layer as the postal service in a country. When you want to send a letter to a friend, you just need to know the destination postal address (e.g […]
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