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Glossary

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maximum burst

Specified in bytes or cells, the largest burst of informa-

tion exceeding the insured rate that will be permitted on an ATM permanent
virtual connection for a short time and will not be dropped even if it goes
over the specified maximum rate. Compare with: insured burst. See also:
maximum rate.

maximum rate

The maximum permitted data throughput on a particular

virtual circuit, equal to the total of insured and uninsured traffic from the
traffic source. Should traffic congestion occur, uninsured information may
be deleted from the path. Measured in bits or cells per second, the maximum
rate represents the highest throughput of data the virtual circuit is ever able
to deliver and cannot exceed the media rate. Compare with: excess rate. See
also: maximum burst.

MBS

Maximum Burst Size: In an ATM signaling message, this metric,

coded as a number of cells, is used to convey the burst tolerance.

MBONE

multicast backbone: The multicast backbone of the Internet, it is

a virtual multicast network made up of multicast LANs, including point-to-
point tunnels interconnecting them.

MCDV

Maximum Cell Delay Variation: The maximum two-point CDV

objective across a link or node for the identified service category in an ATM
network. The MCDV is one of four link metrics that are exchanged using
PTSPs to verify the available resources of an ATM network. Only one
MCDV value is assigned to each traffic class.

MCLR

Maximum Cell Loss Ratio: The maximum ratio of cells in an ATM

network that fail to transit a link or node compared with the total number
of cells that arrive at the link or node. MCDV is one of four link metrics that
are exchanged using PTSPs to verify the available resources of an ATM net-
work. The MCLR applies to cells in VBR and CBR traffic classes whose CLP
bit is set to zero. See also: CBR, CLP, and VBR.

MCR

Minimum Cell Rate: A parameter determined by the ATM Forum for

traffic management of the ATM networks. MCR is specifically defined for
ABR transmissions and specifies the minimum value for the allowed cell rate
(ACR). See also: ACR and PCR.

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