Chapter 14 xDSL Profiles Setup

Table 26 VC Profile (continued)

LABEL

DESCRIPTION

AAL

This field displays the ATM adaptation layer used by the VC profile.

 

aal5 - The VC profile uses ATM adaptation layer 5.

 

 

Class

This field displays the type of ATM traffic class: cbr (constant bit rate), vbr (real-

 

time variable bit rate), nrt-vbr(non-real time variable bit rate) or ubr

 

(unspecified bit rate).

 

 

PCR

This is the Peak Cell Rate (PCR), the maximum number of cells that the sender

 

can send per second.

 

 

CDVT

This field displays the accepted tolerance of the difference between a cell’s

 

transfer delay and the expected transfer delay.

 

 

SCR

The Sustained Cell Rate (SCR) sets the average cell rate (long-term) in cells

 

per second that can be transmitted. SCR applies with the vbr traffic class.

 

 

BT

Burst Tolerance (BT) is the maximum number of cells that the port is guaranteed

 

to handle without any discards. BT applies with the vbr traffic class.

 

 

Select

Select a VC profile’s Select radio button and click Modify to edit the VC profile

Modify

 

 

 

Delete

Select a VC profile’s Select radio button and click Delete to remove the VC

 

profile

 

 

 

The rest of the screen is for PVC configuration.

 

 

Name

When editing a profile, this is the name of this profile. When adding a profile,

 

type a name for the profile. You can use up to 31 ASCII characters; spaces are

 

not allowed.

 

 

Encap

Select the encapsulation type (LLC or VC) for this port.

 

 

Class

Select CBR (constant bit rate) to specify fixed (always-on) bandwidth for voice

 

or data traffic. Select UBR (unspecified bit rate) for applications that are non-

 

time sensitive, such as e-mail. Select VBR (real time variable bit rate) or NRT-

 

VBR (non real time variable bit rate) for bursty traffic and bandwidth sharing with

 

other applications.

 

 

PCR

The Peak Cell Rate (PCR) is the maximum rate at which the sender can send

 

cells. PCR applies with all of the ATM traffic classes. You can type a number of

 

(ATM) cells per second in the first field or type a number of kilobytes per second

 

in the second field to have the system automatically compute the number of

 

ATM cells per second.

 

 

CDVT

Cell Delay Variation Tolerance (CDVT) is the accepted tolerance of the

 

difference between a cell’s transfer delay and the expected transfer delay.

 

CDVT applies with all of the ATM traffic classes. Type the CDVT here.

 

 

SCR

The Sustained Cell Rate (SCR) sets the average cell rate (long-term) that can

 

be transmitted. Type the SCR, which must be less than the PCR. SCR applies

 

with the VBR traffic classes. You can type a number of (ATM) cells per second

 

in the first field or type a number of kilobytes per second in the second field to

 

have the system automatically compute the number of ATM cells per second.

 

 

BT

Burst Tolerance (BT) sets a maximum number of cells that the port is

 

guaranteed to handle without any discards. Type the BT here. BT applies with

 

the VBR traffic classes.

 

 

Add

Click Add to save your changes to the IES-612-51A’s volatile memory. The IES-

 

612-51A loses these changes if it is turned off or loses power, so use the Config

 

Save link on the navigation panel to save your changes to the non-volatile

 

memory when you are done configuring.

 

 

Cancel

Click Cancel to start configuring the screen again.

 

 

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IES-612-51A User’s Guide