Planet Technology 802.11g Wireless ADSL 2/2+ Router ADW-4401A/Bv2 - Manual (Page 28)

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MBS: Maximum Burst Size (MBS) is the maximum number of cells that can be sent at
the PCR. After MBS is reached, cell rates fall below SCR until cell rate averages to the
SCR again. At this time, more cells (up to the MBS) can be sent at the PCR again.
CBR is for connections that support constant rates of data transfer. The only parameter
you need to worry about in CBR is PCR.
UBR is for connections that have variable traffic. The only parameter you need to
worry about in UBR is PCR.
rtVBR is for connections that, while having variable traffic, require precise timing
between traffic source and destination. PCR, SCR and MBS must all be set for rtVBR.
nrtVBR is for connections that have variable traffic, do not require precise timing, but
still require a set bandwidth availability. PCR, SCR and MBS must all be set for
nrtVBR.
3.6.2 WAN Configuration
Go to Interface Setup -> Internet. The router can be connected to your service
provider in any of the following ways.
3.6.2.1 Encapsulation
Select the encapsulation protocol your ISP uses. The following section will vary
depending on which encapsulation protocol you select.