ZyXEL Communications MSC1024G Series User Manual page 234

Chapter 11 Subscriber Port Setup Screens
Figure 139 VDSL Port Setup: Advanced: Optionmask
The following table describes the fields in this screen.
Table 89 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
Enable ADSL2
Annex L
Enable ADSL2+
Annex M
234
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.
Annex L allows transmission at a greater distance. However, it may increase
interference at lower frequencies, due to the higher power used in this range.
Annex M allows faster upload rates.
MSC1000G/1024G/1224G Series User's Guide