Zyxel VES-1616FE-55A [117/318] Ipqos overview
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Zyxel VES-1616FE-55A [117/318] Ipqos overview

Zyxel VES-1616FE-55A [117/318] Ipqos overview
Chapter 14 xDSL Profiles Setup
VES-1616FE-55A User’s Guide
117
14.2 IPQoS Overview
Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay,
and the networking methods used to control the use of bandwidth. Without QoS, all traffic data
is equally likely to be dropped when the network is congested. This can cause a reduction in
network performance and make the network inadequate for time-critical application such as
video-on-demand.
A layer-2 classifier groups traffic according to the Ethernet type, VLAN group, MAC address
and/or port number. A layer-3 classifier groups traffic according to the IP address and/or TCP/
UDP protocol number.
Configure IPQoS on the VES-1616FE-55A to group and prioritize application traffic in
queues for downstream direction (toward CPE devices) and fine-tune network performance.
Setting up IPQoS involves four parameters:
Max Rate Type a maximum downstream transfer rate (64 to 128000 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 128000 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 VES-1616FE-55A’s volatile memory. The
VES-1616FE-55A 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 27 xDSL Port Profile (continued)
LABEL DESCRIPTION

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