3Com 3CRWDR300A-73 Router Manual PDF (Setup & Configuration Guide)

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Internet Settings

79

12

QoS Class: select

CBR, UBR

or

VBR

.

■

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.

■

VBR (variable bit rate): QoS class defined by the ATM Forum for

ATM networks. VBR is subdivided into a real time (RT) class and

non-real time (NRT) class. VBR (RT) is used for connections in which

there is a fixed timing relationship between samples. VBR (NRT) is

used for connections in which there is no fixed timing relationship

between samples, but that still need a guaranteed QoS. Compare

with ABR, CBR, and UBR.

■

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”.

13

PCR/SCR/MBS: PCR (Peak Cell Rate), SCR (Sustainable Cell Rate) and MBS

(Maximum Burst Size) are configurable.

14

Click

Apply

.

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80

C

HAPTER

5: C

ONFIGURING

THE

R

OUTER

PPPoA

PPP over ATM, this is a popular choice among European DSL providers. To

configure this function correctly, you should obtain the information from

your ISP.

Figure 62

PPPoA Settings Screen

1

Select

PPPoA

from the

protocol

drop-down menu.

2

IP assigned by ISP, if select Yes, then no need to enter the IP address and

Subnet mask information. If select No, then enter the IP address and

Subnet mask information.

3

Enter the user name assigned to you by your ISP in the

Username

field.

And enter the password assigned to you by your ISP in the

Password

field.

Re-enter your password in the

Confirm Password

field.

4

Select

always connected, auto

, or

manual

from the

Connect type

drop-down menu. If you have a flat rate service charge for Internet

connection, select always connected. If your ISP charges you by the

minute, do not select this mode.

5

If you want your Router to automatically disconnect from the Internet

after a period of inactivity, specify a time in the

Idle Time

field. (Enter a

value of 0 to disable this timeout).

6

Enter the MTU value in the

MTU

field. Do not make changes to this

setting, unless your ISP specifically requires a different setting other than

1454.

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Page 83 / 182

Internet Settings

81

7

IPCP is used by PPP protocol to get one IP address from the PPP server.

IPCP subnet function allows you to obtain a subnet (IP address and

netmask), rather than an IP address. Check this box to enable the

function.

8

IPCP Subnet Populate DHCP Server: enable this function to allow the

Router to automatically apply the subnet from IPCP subnet to DHCP

server. Then LAN clients can get the public IP address assigned by ISP,

rather than a private IP address of the local LAN.

9

Check the

Add Default Route

checkbox to set this PVC as the default

route, this is used when you configure more than one PVC for the Router.

10

Enter the VPI/VCI values. Or click

Auto Search

to find out the values. VPI

(Virtual Path Identifier) and VCI (Virtual Circuit Identifier) numbers should

be provided by your ISP.

11

Select the Encapsulation,

VC MUX

or

LLC

. This information should be

provided by your ISP.

12

QoS Class: select

CBR, UBR

or

VBR

.

■

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.

■

VBR (variable bit rate): QoS class defined by the ATM Forum for

ATM networks. VBR is subdivided into a real time (RT) class and

non-real time (NRT) class. VBR (RT) is used for connections in which

there is a fixed timing relationship between samples. VBR (NRT) is

used for connections in which there is no fixed timing relationship

between samples, but that still need a guaranteed QoS. Compare

with ABR, CBR, and UBR.

■

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”.

13

PCR/SCR/MBS: PCR (Peak Cell Rate), SCR (Sustainable Cell Rate) and MBS

(Maximum Burst Size) are configurable.

14

Click

Apply

.

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Page 84 / 182

82

C

HAPTER

5: C

ONFIGURING

THE

R

OUTER

Bridge Mode

If your ISP limits access to the Internet to specific computers, this means

that traffic to/from these computers only will be forwarded. In this case,

Bridge Mode is used to connect to the ISP. The ISP will generally give one

Internet account and limit only one computer to access the Internet.

Check with your ISP to determine if this mode is used for your Internet

connection.

Figure 63

Bridge Mode Screen

1

Select

Bridge Mode

from the

Protocol

drop-down menu.

2

Select

VLAN

.

3

Enter the VPI/VCI values. Or click

Auto Search

to find out the values. VPI

(Virtual Path Identifier) and VCI (Virtual Circuit Identifier) numbers should

be provided by your ISP.

4

Select the Encapsulation,

VC MUX

or

LLC

. This information should be

provided by your ISP.

5

QoS Class: select

CBR, UBR

or

VBR

.

■

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.

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Internet Settings

83

■

VBR (variable bit rate): QoS class defined by the ATM Forum for

ATM networks. VBR is subdivided into a real time (RT) class and

non-real time (NRT) class. VBR (RT) is used for connections in which

there is a fixed timing relationship between samples. VBR (NRT) is

used for connections in which there is no fixed timing relationship

between samples, but that still need a guaranteed QoS. Compare

with ABR, CBR, and UBR.

■

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”.

6

PCR/SCR/MBS: PCR (Peak Cell Rate), SCR (Sustainable Cell Rate) and MBS

(Maximum Burst Size) are configurable.

7

Click

Apply

.

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