Vdsl Port Setup Advanced: Vdsl Optionmask Screen - ZyXEL Communications MSC1000G User Manual

9.8.5 VDSL Port Setup Advanced: VDSL Optionmask Screen

Click the Optionmask link in the advanced VDSL Port Setup screen to display a pop-up screen as
shown. Use this screen to enable features on a port for advanced troubleshooting. ADSL features
are included because the VDSL line card supports ADSL fallback.
Figure 144 VDSL Port Setup: Advanced: Optionmask
The following table describes the fields in this screen.
Table 103 VDSL Port Setup: Advanced: Optionmask
LABEL
All
Disable Trellis
Disable Reed
Solomon
Disable
Upstream/
Downstream
Bitswap
Disable 1-bit
Constellation
Disable Transmit
Windowing
Disable S=0.5
Support(ADSL1
Only)
Reserved
Enable Nitro
Management Switch Card User's Guide
DESCRIPTION
Use the check boxes to disable individual features. Use the All check box to select every
feature check box.
Trellis encoding helps to reduce the noise in ADSL transmissions. Trellis may reduce
throughput but it makes the connection more stable.
Reed-Solomon performs transmission error correction.
Bit swapping allows the system to respond to noise on a tone by sending data on another
tone. The subscriber (ATU-R) equipment must also support bit swapping in order for this
feature to work.
1-bit constellation allows the system to send individual bits over DMT tones that can only
support one bit. This allows the connection to use as many of the tones as possible.
Transmit windowing is only available with ADSL2+.
0.5 support maps two Reed-Solomon code words into one data frame (instead of one) to
increase the maximum G.dmt transmission rate.
At the time of writing, this feature is not available.
This allows ATM header compression for greater bandwidth efficiency.
Chapter 9 Subscriber Port Setup Screens
235