Agilent Technologies J3972A manual Virtual Path Identifier VPI, Vp nominal Velocity of Propagation

Virtual Path Identifier (VPI)

The Virtual Path Identifier is an 8-bit field in the ATM header.The VPI and VCI are used together to determine the destination address of the ATM cell.

Vp (nominal Velocity of Propagation)

The speed that a pulse travels along a given cable. Vp is expressed as a percentage of the speed of light in a vacuum.

WAN (Wide Area Network)

A data network engineered for relatively lower speed data transfers over unlimited distances. Often the links in a WAN are provided by a third party.

Wide Area Network (WAN)

A communications network that uses public and/or private telecommunications facilities to link computing devices that are spread over a wide geographic area.

Yellow Alarm

The Remote Alarm Indication (RAI (Yellow)) is a 1-bit field in the Path Status octet (G1) of a PLCP frame. An RAI value in a PLCP frame is set to 1 after an error condition has been detected. The RAI is cleared (0) after the error condition has not occurred for a certain period of time.

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