Glossary

glossary

A

ABR

The Available Bit Rate (ABR) is an ATM layer service category for which the limiting ATM layer transfer characteristics provided by the network may change subsequent to connection establishment.

ACR

Allowed Cell Rate is the current rate at which a source is allowed to send.

C

CAC

The Connection Admission Control (CAC) function is defined as the set of actions taken by the network at SVC establishment or by network management during PVC establishment in order to determine whether a connection can be progressed or should be rejected.

CBR

The Constant Bit Rate (CBR) service category is used by connections that request a static amount of bandwidth that is continuously available during the connection lifetime. This amount of bandwidth is characterized by a PCR value.

CDF

The Cutoff Decrease Factor controls the decrease in ACR associated with the CRM.

CDVT

Cell Delay Transfer Variation Tolerance

CRM

Missing RM-cell count. CRM limits the number of forward RM-cells which may be sent in the absence of received backward RM-cells.

G

GCRA

The Generic Cell Rate Algorithm(GCRA) is used to define conformance with respect to the traffic contract.For each cell arrival, the GCRA determines whether the cell conforms to the traffic contract of the connection.

M

MBS

Maximum Burst Size.

MCR

Minimum Cell Rate is the rate at which the source is always allowed to send.

N

nrt-VBR

The non-real-time Variable Bit Rate (nrt-VBR) service category is intended for non-real-time applications which have bursty traffic characteristics. The nrt-VBR is characterized in terms of a PCR, SCR and MBS.

P

PCR

The Peak Cell Recapture traffic parameter specifies an upper bound on the rate at which traffic can be submitted on an ATM connection.

R

RDF

Rate Decrease Factor controls the decrease in the cell transmission rate

rt-VBR

The real-time Variable Bit Rate (rt-VBR) service category is intended for real-time applications, for example,those requiring tightly constrained delay and delay variation, as would be appropriate for voice and video applications.The rt-VBR connections are characterized in terms of a PCR, SCR and MBS.

S

SCR

Sustained Cell Rate.

U

UBR

The Unspecified Bit Rate (UBR) service category is intended for non-real-time applications,for example,those not requiring tightly constrained delay and delay variation. The UBR service does not specify traffic related service guarantees. The UBR service is indicated by use of the Best Effort Indicator in ATM User Cell Rate Information element.

UPC

Usage Parameter Control (UPC) is defined as the set of actions taken by the network to monitor and control traffic.

A
ABR	The Available Bit Rate (ABR) is an ATM layer service category for which the limiting ATM layer transfer characteristics provided by the network may change subsequent to connection establishment.
ACR	Allowed Cell Rate is the current rate at which a source is allowed to send.

C
CAC	The Connection Admission Control (CAC) function is defined as the set of actions taken by the network at SVC establishment or by network management during PVC establishment in order to determine whether a connection can be progressed or should be rejected.
CBR	The Constant Bit Rate (CBR) service category is used by connections that request a static amount of bandwidth that is continuously available during the connection lifetime. This amount of bandwidth is characterized by a PCR value.
CDF	The Cutoff Decrease Factor controls the decrease in ACR associated with the CRM.
CDVT	Cell Delay Transfer Variation Tolerance
CRM	Missing RM-cell count. CRM limits the number of forward RM-cells which may be sent in the absence of received backward RM-cells.

M
MBS	Maximum Burst Size.
MCR	Minimum Cell Rate is the rate at which the source is always allowed to send.

R
RDF	Rate Decrease Factor controls the decrease in the cell transmission rate
rt-VBR	The real-time Variable Bit Rate (rt-VBR) service category is intended for real-time applications, for example,those requiring tightly constrained delay and delay variation, as would be appropriate for voice and video applications.The rt-VBR connections are characterized in terms of a PCR, SCR and MBS.

U
UBR	The Unspecified Bit Rate (UBR) service category is intended for non-real-time applications,for example,those not requiring tightly constrained delay and delay variation. The UBR service does not specify traffic related service guarantees. The UBR service is indicated by use of the Best Effort Indicator in ATM User Cell Rate Information element.
UPC	Usage Parameter Control (UPC) is defined as the set of actions taken by the network to monitor and control traffic.

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glossary