Chapter 14 xDSL Profiles Setup

 

Table 25 Port Profile (continued)

 

LABEL

DESCRIPTION

 

Down Shift SNR

The upstream 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 upstream down shift signal to noise margin to be

 

 

less than or equal to the target upstream signal to noise margin and greater than

 

 

or equal to the minimum upstream signal to noise margin.

 

 

 

 

Down Stream

The following parameters relate to downstream transmissions.

 

 

 

 

Max Rate

Type a maximum downstream transfer rate (64 to 32000 Kbps) bps for this port.

 

 

Configure the maximum downstream transfer rate to be greater than the

 

 

maximum upstream transfer rate.

 

 

 

 

Min Rate

Type the minimum downstream transfer rate (32 to 32000 Kbps) for this port.

 

 

Configure the minimum downstream transfer rate to be less than the maximum

 

 

downstream transfer rate.

 

 

 

 

Interleave Delay

Configure this field when you set the Latency Mode field to interleave. Type

 

 

the number of milliseconds (1-255) of interleave delay to use for upstream

 

 

transfers. It is recommended that you configure the same latency delay for both

 

 

upstream and downstream.

 

 

 

 

Max SNR

Type the maximum downstream signal to noise margin (0-31 dB).

 

 

 

 

Min SNR

Type the minimum downstream signal to noise margin (0-31 dB). Configure the

 

 

minimum downstream signal to noise margin to be less than or equal to the

 

 

maximum downstream signal to noise margin.

 

 

 

 

Target SNR

Type the target downstream signal to noise margin (0-31 dB). Configure the

 

 

target downstream signal to noise margin to be greater than or equal to the

 

 

minimum downstream signal to noise margin and less than or equal to the

 

 

maximum downstream signal to noise margin.

 

 

 

 

Up Shift SNR

The downstream up shift signal to noise margin (0-31 dB). When the channel’s

 

 

signal to noise margin goes above this number, the device can attempt to use a

 

 

higher transfer rate. Configure the downstream up shift signal to noise margin to

 

 

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

 

 

less than or equal to the maximum downstream signal to noise margin.

 

 

 

 

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-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.

 

 

 

14.2 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 14.3 on page 128). This allows you to fine-tune the levels of services on the priority of the traffic flow.

 

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IES-612-51A User’s Guide