Atm Qos - ZyXEL Communications IES-612-51A User Manual

Table 25 Port Profile (continued)
LABEL
Down Shift SNR
Down Stream
Max Rate
Min Rate
Interleave Delay
Max SNR
Min SNR
Target SNR
Up Shift SNR
Down Shift SNR
Add
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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
services on the priority of the traffic flow.
IES-612-51A User's Guide
DESCRIPTION
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.
The following parameters relate to downstream transmissions.
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.
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.
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.
Type the maximum downstream signal to noise margin (0-31 dB).
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.
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.
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.
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.
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.
Click Cancel to start configuring the screen again.
Section 14.3 on page
Chapter 14 xDSL Profiles Setup
128). This allows you to fine-tune the levels of
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