ZyXEL Communications MSC1000G Series, Руководство пользователя

Страница: 359 / 1168

Chapter 11 Profile Screens
Management Switch Card User’s Guide
359
11.11 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 the following section on traffic shaping). This allows you to fine-tune the levels of
services on the priority of the traffic flow.
Wire Pair Select a wire pair number.
Select 2wire for a normal connection using a single SHDSL port’s two wires, this is the
default.
Select 4wire for a 4-wire n-wire group (two SHDSL ports grouped together).
Select mpair4 for an 8-wire n-wire group (four SHDSL ports grouped together).
Line Probing
Enable Mode The SHDSL line card and subscriber modem use line probes to determine the best possible
transmission rate. This is used in rate adaptation.
Disable the line probe to have the system skip the rate adaptation phase to shorten
connection set up time.
Select enable (current_condition_ target_SNR) to enable line probing using the
current target Signal to Noise Ratio margin.
Select enable (worst_case_target_SNR) to enable line probing using the worst case
target Signal to Noise Ratio margin.
Current
Condition SNR
Margin [-10~21] Type the current condition target Signal to Noise Ratio margin, -10 ~ 21 in dB. You only
configure this if you enable line probing using the current target Signal to Noise Ratio
margin.
Worst Case SNR
Margin [-10~21] Type the worst case Signal to Noise Ratio margin, -10 ~ 21 in dB. You only configure this if
you enable line probing using the worst case target Signal to Noise Ratio margin.
Apply Click Apply to save the changes in this screen to the system’s volatile memory. The
system loses these changes if it is turned off or loses power, so use the Config Save link
on the navigation panel and then the Save button to save your changes to the non-volatile
memory when you are done configuring.
New While you are modifying a profile, you can click New to start configuring a fresh profile
without saving your changes.
Cancel Click Cancel to start configuring the screen again.
The bottom part of the screen lists the configured profiles.
Index This is the port profile index number.
Name These are the names of individual profiles. The DEFVAL profile always exists and all of the
DSL ports have it assigned to them by default.
Max Rate (kbps) This is the maximum transfer rate (in Kbps) for this profile.
Min Rate (kbps) This is the minimum upstream transfer rate (in Kbps) for this profile.
Modify Select a profile’s Select radio button and click Modify to edit the profile.
Delete Select a profile’s Select radio button and click Delete to remove the profile.
Table 168
SHDSL Profile (continued)
LABEL DESCRIPTION