The Advanced Screen - ZyXEL Communications VMG1312-B Series User Manual

Chapter 6 Broadband
Table 11 Network Setting > Broadband > 3G Backup (continued)
LABEL
Apply
Cancel

6.4 The Advanced Screen

Use the Advanced screen to enable or disable PTM over ADSL, Annex M/Annex J, and DSL PhyR
functions. The Device supports the PhyR retransmission scheme. PhyR is a retransmission scheme
designed to provide protection against noise on the DSL line. It improves voice, video and data
transmission resilience by utilizing a retransmission buffer.
Click Network Setting > Broadband > Advanced to display the following screen.
Figure 24 Network Setting > Broadband > Advanced (VMG1312-B10A)
Figure 25 Network Setting > Broadband > Advanced (VMG1312-B30A)
The following table describes the labels in this screen.
Table 12 Network Setting > Network Setting > Broadband
LABEL
PTM over ADSL
Annex M
Annex J
PhyR US
96
DESCRIPTION
Click Apply to save your changes back to the Device.
Click Cancel to return to the previous configuration.
DESCRIPTION
Select Enable to use PTM over ADSL. Since PTM has less overhead than ATM, some ISPs
use PTM over ADSL for better performance.
You can enable Annex M or Annex J for the Device to use double upstream mode to
increase the maximum upstream transfer rate.
Enable or disable PhyR US (upstream) for upstream transmission to the WAN. PhyR US
should be enabled if data being transmitted upstream is sensitive to noise. However,
enabling PhyR US can decrease the US line rate. Enabling or disabling PhyR will require the
CPE to retrain. For PhyR to function, the DSLAM must also support PhyR and have it
enabled.
VMG1312-B Series User's Guide