PRELIMINARYAppendix D: Glossary
UBR | Unspecified Bit Rate is an ATM traffic type used for LAN traffic. When network | ||||
| congestion occurs, the data is stored in a buffer until it can be sent. | ||||
UDP | User Datagram Protocol is a transport protocol used to map inbound traffic (from a | ||||
| remote IP address) to an internal (LAN) IP address. Uses a protocol port number for | ||||
| the destination at the remote location. |
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upstream traffic | Communications from a user to a service provider. |
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VCI | Virtual Channel Identifier is a | ||||
| cell used to route cell traffic. It identifies a particular VC link for a given VP. | ||||
VCMUX | Virtual Channel | ||||
| numbers of virtual channels making it practical to carry a single protocol per virtual | ||||
| channel. |
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Virtual Circuits are logical connections in the ATM network over which ATM cells are | |||||
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VPI | Virtual Path Identifier is an | ||||
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| cell that is used to route cell traffic. It identifies a particular VP link. | ||||
VPs | Virtual Paths are groups of VCs carried between two points. The VP provides a means | ||||
| of bundling traffic traveling in the same direction. VPs are defined by a unique VPI | ||||
| value. |
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WAN | Wide Area Network is a network consisting of nodes located across a large | ||||
| geographical area. Also, the connection between a service provider and Megabit 700F | ||||
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Megabit Modem 500L Installation Manual | 79 |