3Com 3CRWDR100U-72 User Guide - Page 51

PPPoA, Protocol, Encapsulation Type

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Internet Settings 49 PPPoA PPP over ATM, this is a popular choice among European DSL providers. To configure this page correctly, you should obtain the information on this page from your ISP. Figure 39 PPPoA Settings Screen 1 Select PPPoA from the Protocol drop-down menu. 2 Enter the VPI and VCI parameters provided to you by your ISP in the VPI and VCI fields. 3 Select the encapsulation type (LLC or VC MUX) in the Encapsulation Type field. This information is provided to you by your ISP. 4 Select the type of Quality of Service (CBR, UBR or VBR) in the QoS field. ■ CBR (constant bit rate): the CBR service class is intended for real-time applications, for example, those requiring tightly constrained delay and delay variation, such as voice and video applications. The consistent availability of a fixed quantity of bandwidth is considered appropriate for CBR service. ■ UBR (unspecified bit rate): the UBR service class is intended for delay-tolerant or non-real-time applications, for example, those which do not require tightly constrained delay and delay variation, such as traditional computer communications applications. The UBR service may be considered as "best effort service". ■ VBR (variable bit rate): QoS class defined by the ATM Forum for ATM networks. VBR is subdivided into a real time (RT) class and

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Internet Settings
49
PPPoA
PPP over ATM, this is a popular choice among European DSL providers. To
configure this page correctly, you should obtain the information on this
page from your ISP.
Figure 39
PPPoA Settings Screen
1
Select
PPPoA
from the
Protocol
drop-down menu.
2
Enter the VPI and VCI parameters provided to you by your ISP in the
VPI
and
VCI
fields.
3
Select the encapsulation type (LLC or VC MUX) in the
Encapsulation Type
field. This information is provided to you by your ISP.
4
Select the type of Quality of Service (CBR, UBR or VBR) in the QoS field.
■
CBR (constant bit rate): the CBR service class is intended for
real-time applications, for example, those requiring tightly
constrained delay and delay variation, such as voice and video
applications. The consistent availability of a fixed quantity of
bandwidth is considered appropriate for CBR service.
■
UBR (unspecified bit rate): the UBR service class is intended for
delay-tolerant or non-real-time applications, for example, those
which do not require tightly constrained delay and delay variation,
such as traditional computer communications applications. The
UBR service may be considered as "best effort service".
■
VBR (variable bit rate): QoS class defined by the ATM Forum for
ATM networks. VBR is subdivided into a real time (RT) class and