ZyXEL Communications IES-1248-51 Guía de usuario descargar pdf (Pagina 142)

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Chapter 17 xDSL Profiles Setup

IES-1248-51V User’s Guide

142

17.2 ATM QoS

ATM Quality of Service (QoS) mechanisms provide the best service on a per-flow

guarantee. ATM network infrastructure was designed to provide QoS. It uses fixed

cell sizes and built-in traffic management (see Section 17.3 on page 142). This

allows you to fine-tune the levels of services on the priority of the traffic flow.

17.3 Traffic Shaping

Traffic shaping is an agreement between the carrier and the subscriber to regulate

the average rate and fluctuations of data transmission over an ATM network. This

agreement helps eliminate congestion, which is important for transmission of real

time data such as audio and video connections.

Note: Traffic shaping controls outgoing (downstream) traffic, not incoming (upstream).

17.3.1 ATM Traffic Classes

These are the basic ATM traffic classes defined by the ATM Forum Traffic

Management 4.0 Specification.

17.3.1.1 Constant Bit Rate (CBR)

Constant Bit Rate (CBR) is an ATM traffic class that provides fixed bandwidth. CBR

traffic is generally time-sensitive (doesn’t tolerate delay). CBR is used for

connections that continuously require a specific amount of bandwidth. Examples

of connections that need CBR would be high-resolution video and voice.

Down Shift SNR The downstream down shift signal to noise margin (0-31 dB). When

the channel’s signal to noise margin goes below this number, the

device shifts to a lower transfer rate. Configure the downstream down

shift signal to noise margin to be less than or equal to the target

downstream signal to noise margin and greater than or equal to the

minimum downstream signal to noise margin.

Add Click Add to save your changes to the IES-1248-51V’s volatile

memory. The IES-1248-51V 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.

Table 26 Port Profile (continued)

LABEL DESCRIPTION

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 653 654

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