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TCP/IP - Datagrams/Packets Connectionless
ATM works by transmitting all traffic as fixed-length, 53-byte cells. This fixed unit allows very fast switches to be built, because it is much faster to process a known packet size than to figure out the start and end of variable length packets. The small ATM packet also ensures that voice and video can be inserted into the stream often enough for realtime transmission.
Glossary: See Also: Cisco Terms and Acronyms Glossary at Ciena 802.11 - Wireless Ethernet ABR Available Bit Rate. ATM QoS that adjusts bandwidth according to congestion levels for LAN traffic. ADM - Add Drop Multiplexer ADSL Asymmetric DSL AAL5 - ATM Adaptation Layer 5 ATM Asynchronous Transfer Mode CATV Community Antenna TV (Original name for Cable TV) CBR Constant Bit Rate. ATM QoS guarantees bandwidth for realtime voice and video. CLNP (Connectionless Network Protocol) used by TP4 (Transport Protocol Class 4). However CLNP is not used on the Internet, instead its function is provided by IP. CLNP is still widely used today in many telecommunications networks (mainly the transmission area) CMTS - Cable modem termination system Connection Oriented Link Layer (COLL) Connection-oriented networking protocol is one which identifies traffic flows by some connection identifier rather than by explicitly listing source and destination addresses. ATM and Frame Relay are Connection-oriented protocols Connection-oriented protocols handle real-time traffic substantially more efficiently than connectionless protocols CPE Customer premises equipment Datagram - Used to transfer IP across ATM networks. DCE Data Communications Equipment DLC - Digital loop Carrier DMA Direct Memory Access - Specialized circuitry or a dedicated microprocessor that transfers data from memory to memory without using the CPU DOCSIS Data Over Cable Service Interface Specification. DSL Digital Subscriber Line DSLAM - Digital Subscriber Line Access Multiplexor DWDM Dense WDM FDDI - Gbps - Giga bits per second (Trillion) HDLC IPv4 IPv6 IPsec Kbps - Thousand bits per second Logical Link Control (LLC) Mbps - Mega bits per second (Million) MPLS - Multiprotocol Label Switching. A data-carrying mechanism which emulates some properties of a circuit-switched network over a packet-switched network. MTU - Message transfer Unit (e.g. maximum packet size) NIC Network Interface Card OC-1 Optical Carrier level-1 - 51.84Mbps OC-3 Optical Carrier level-3 - 155Mbps OC-12 Optical Carrier level-231 - 622Mbps OC-48 Optical Carrier level-48 - 2.5Gbs OC-192 Optical Carrier level-192 - 9.95Gbs OC-256 Optical Carrier level-256 - 13.2Gbs ODI Open Data-Link Interface) A network driver interface from Novell & Apple OTG On the Go,OBJECTive Technology Group. Small connector USB. Organizationally Unique Identifier (OUI) Packet is a formatted block of information carried by a computer network. Packets have headers, data and trailers. The header is used among other things to identify the destination for the data. The trailer is used for things like error checking. POS Packet on SONET QoS Quality of Service SDH synchronous digital hierarchy, the ITU-T (European) equivalent of SONET SAN Storage Area Network SIAP Service Independent Access Service Independent Access Points SMDS - Switched Multi-megabit Data Service SOAP - Simple Object Access Protocol - a protocol for exchanging XML-based messages over a computer network. SOA - Service-Oriented Architecture SONET Synchronous Optical Network SRSC SilkRoad Refractive Synchronization Communication STS-n Synchronous Transport Signal level-n (see OC-n for speeds) TCP/IP - Transmission Control Protocol / Internet Protocol Tbps Terra bits per second (Quadrillion) USB Universal Serial Bus USB OTG - USB On The Go - Will allow peripheral and mobile devices like PDAs, cell phones and digital cameras to be attached directly to one another without having to have a PC in between. U160-SCSI Ultra SCSI allowing 160 MBytes/s UBR Unspecified Bit Rate provides a best effort for non-critical data such as file transfers. VOD Video on Demand WAN Wide Area Networks WDM Wave Division Multiplexing ------------------- ATM Asynchronous Transfer Mode B-ICI Broadband Inter Carrier Interface CBDS Connectionless Broadband Data Service CBR Constant Bit Rate CCS7 Common Channel Signalling System no. 7 CMIP Common Management Information Protocol CMIS Common Management Information Service CSU Channel Service Unit DSU Data Service Unit DQDB Distributed Queue Dual Bus ETSI European Telecommunications Standards Institute FDDI Fiber Distributed Data Interface IP Internet Protocol ISDN Integrated Services Digital Network ITU International Telecommunication Union LAN Local Area Network MAN Metropolitan Area Networks MICE Multimedia Integrated Conferencing for Europe MIB Management Information Base MMM Multimedia Mail NNI Network-Node Interface PBX Private Branch Exchange PICS Protocol Implementation Conformance Statement PIXIT Protocol Information Extra Information for Testing PDH Plesiochronous Digital Hierarchy PMD Physical Medium Dependent (Sublayer) PNO Public Network Operator PVC Permanent Virtual Circuit QoS Quality of Service SDH Synchronous Digital Hierarchy SMDS Switched Mutimegabit Data Service SNMP Simple Network Management Protocol TCP Transmission Control Protocol TMN Telecommunication Management Network TS Telecommunication Standardization (Sector) UNI User-Network Interface UDP User Datagram Protocol WAN Wide Area Network