Term
| Citcuit Switching Networks |
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Definition
| connection established for a session and used until session is finished. - a different path may be established with all new sessions |
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Term
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Definition
| paths defined logically in a provider's network and assigned to id's rather than physical locations - can be permanent or switched |
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Term
| PVCs (Permanent Virtual Circuits) |
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Definition
| usually leased lines - connect end points and always on - telco id's endpoints with DLCI - fast and reliable - fixed price per month |
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Term
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Definition
| Data Link Connection Identifier, pronounced del-see |
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Term
| SVCs (Switched Virtual Circuits) |
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Definition
| usually dial-up and demand-dial - more flexible than PVCs by allowing one endpoint to connect to multiple other endpoints - established upon requests - pay-per-use - usually cheaper for temp use but slower and can become more expensive |
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Term
| Packet Switching Networks |
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Definition
| communication broken up into varried-length packets - each packet finds its own best route - compensates for congestion and dead links - can arrive out of order - not optimal for streaming media |
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Term
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Definition
| like packet-switching, but with fixed-length packets - unfilled packet is given filler data to reach capacity - more predictable traffic than packet switching |
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Term
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Definition
| cable television connection and a cable modem - operates on Physical and Data-link layer of OSI - Contention-based with contention groups so speed varries - signals split at proider's end |
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Term
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Definition
| 10 Mbps access limit requiring 10-MB NIC - can funciton at 27 Mbps - 1,000 times faster than 28.8 modems |
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Term
| DSL (Digital Subscriber Line) |
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Definition
| group of technologies for 1.5 Mbps dl speeds and affordable digital connection using existing phone lines - 18,000 feet hard limit to telco switch |
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Term
| DSLAM (Digital Subscriber Line Access Multiplexer) |
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Definition
| located on telco end, combines signals from multiple users into high-speed backbone into telco network |
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Term
| HDSL (High Data Rate DSL) |
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Definition
| 1.544 to 2.048 Mbps duplex - T1/E1 - limit of 12,000 feet |
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Term
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Definition
| 1.544 Mbps up and 8 Mbps down - Primarily for Internet and Web services - limit of 18,000 feet |
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Term
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Definition
| 1.544 Mbps up and down - one line of twisted pair - limit of 12,000 feet |
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Term
| VDSL (Very High Speed DSL) |
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Definition
| 12.9 to 52.9 Mbps down and 1.5 to 16 Mbps up - limit 4,500 feet |
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Term
| Dedicated or Leased Data Lines |
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Definition
| bw varies based on technologies used - 56 kb to 2 Mb ps - fixed fee based on distance - guaranteed bw and connection time |
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Term
| ISDN (Integrated Services and Digital Network) |
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Definition
| circuit siwtching that splits voice and data over digital phone lines or PSTN wires - connections made on by dialling another ISDN's phone number - channelized with BRI or PRI - Largely replaced by ADSL |
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Term
| BRI (Basic Rate Interface) |
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Definition
| bearer channel (B) 64 kbps X 2 and delta channel (D) 16 Kbps totalling 144 Kbps |
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Term
| PRI (Primary Rate Interface) |
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Definition
| bearer channel (B) 64 kbps X 23 and delta channel (D) 64 Kbps totalling 1.544 Mbps |
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Term
| PSTN (Public Switched Telephone Networks) |
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Definition
| Used for Dial-up - modems, existing phonlines, and existing long-distance carrier services - low cost and low bandwidth (56 Kbps) for remote locations - often used as back-up for faster connections - RJ-11 to modem to Com-port or expansion bus |
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Term
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Definition
| Packet Switching Implimentation - efficient alternative to X.25 - designed to PRI-ISDN but works well with other network types - clean Carrier so less error-correction overhead - usually PVC, but can be SVC |
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Term
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Definition
| 70's packet switching technology for data communication over then existing Long-distance carriers - reliablity over speed, now used mostly on leased lines and local connections |
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Term
| FRBS (FRame Bearer Service) |
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Definition
| aka frame network cloud - network of switches that make connections between endpoints - allows virtual circuit between two DTE devices (either router or single network device) |
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Term
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Definition
| a switch on a frame network |
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Term
| DTE (Data Terminal Equipment) |
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Definition
| X.25 endpoint and can be a card in PC or Server that interfaces with a router or a stand-alone device - Connected to DCE |
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Term
| DCE (Data Circuit Equipment) |
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Definition
| connects customer to X.25 backbone |
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Term
| PSE (Packet Switching Equipment) |
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Definition
| backbone of an X.25 network |
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Term
| ATM (Asynchronous Transfer Mode) |
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Definition
| 53-byte Cell-switching technology - can be used for LAN (Expensive), WAN (popular), & Telephone networks - versitile and High bw |
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