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List of terms
cell
A small,
cell delay variation (CDV)
The allowable variation in time that a cell can take to travel over a virtual connection. Also, the measurable variation in the interval between ATM cells arriving at a network element. The accumulation of this variation results in cell clumping. Also known as cell delay variance.
cell delay variation tolerance (CDVT)
One of a set of ATM traffic characterization values. CDVT defines the tolerance to cell clumping that results from the accumulating amount of cell delay variation or “jitter” in the network or customer premises equipment (CPE). CDVT is Nortel Multiservice Switch
cell header
Information wrapped within a cell that determines the destination of the cell and carries sequencing and error detection information.
cell loss priority (CLP)
A bit located in the ATM cell header that identifies the priority of the cell as eligible for discard at a point of congestion.
cell loss ratio (CLR)
The allowable percentage of cells that can be lost for a given traffic type. CLR is the ratio between ATM cells transmitted by the source over a link and the number of cells discarded by the destination due to congestion. CLR is a QOS class parameter that defines the loss ratio that the service provider agrees to over the lifetime of a connection.
cell queue controller (CQC)
The hardware chip that supports traffic shaping and usage parameter control on ATM interfaces and connections, and that permits
cell queue memory (CQM)
The RAM memory used by the cell queue controller (CQC). This memory is used as buffer space for the link transmit queues, reserved space, and connection space.
Nortel Multiservice Switch 7400/15000/20000
Terminology
PCR7.2 and up March 2006
Copyright © 2006, Nortel | Nortel Confidential |
