ZyXEL Communications MSC1000G Series, Руководство пользователя

Страница: 344 / 1168

Chapter 11 Profile Screens
Management Switch Card User’s Guide
344
11.7.2 VDSL2 Line Profile Setup > Rate Adaptive
Click the Modify link next to the Rate Adaptive field in the VDSL2 Line Profile Setup screen to
open the screen as shown next. Use the screen to configure detailed rate adaption settings.
Figure 221
Profile > VDSL2 > LineProfile > Rate Adaptive
The following table describes the labels in this screen.
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 160
Profile > VDSL2 > LineProfile (continued)
LABEL DESCRIPTION
Table 161
Profile > VDSL2 > LineProfile > Rate Adaptive
LABEL DESCRIPTION
Downstream Configure the following settings for the connection direction going to the CPEs.
Upstream Configure the following settings for the connection direction coming from the CPEs.
Rate Adaptive Select the rate adaptive modes for downstream and upstream transmissions.
Select Manual to fix the transmit rate as the minimum net data rate and disable
transmission rate adjustment. If the attainable speeds cannot match configured speeds,
then the link may go down or communications may be sporadic due to line errors and
consequent retransmissions.
Select AdaptInit to keep the transmit rate negotiated between CO and CPE devices. It
ranges from the configured minimum to the maximum net data rate based on the initial
line condition.
Select DynamicRa to dynamically change the transmission rate negotiated between
the system and CPE devices during initialization as well as during SHOWTIME status.
Select SOS to dynamically change the transmission rate. It also uses emergency rate
reduction (SOS) when the line experiences a noise spike. This helps keep the
connection up as much of the time as possible.