ZyXEL Communications VMG1312-B Manual Do Utilizador

Chapter 6 Broadband

VMG1312-B Series User’s Guide

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.

Network Setting > Broadband > Advanced (VMG1312-B10A)

Network Setting > Broadband > Advanced (VMG1312-B30A) 

The following table describes the labels in this screen. 

Apply

Click Apply to save your changes back to the Device.

Cancel

Click Cancel to return to the previous configuration.

Network Setting > Broadband > 3G Backup (continued)

Network Setting > Network Setting > Broadband

PTM over ADSL

Select Enable to use PTM over ADSL. Since PTM has less overhead than ATM, some ISPs 
use PTM over ADSL for better performance.

Annex M

Annex J

You can enable Annex M or Annex J for the Device to use double upstream mode to 
increase the maximum upstream transfer rate.

PhyR US

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.