ZyXEL Communications MSC1024G Series User Manual page 229

Table 86 VDSL Port Setup: Advanced
LABEL
TEL
VDSL Profile
Alarm Profile
PVID/ Priority
IPQoS Profile
VDSL Feature
Optionmask
RFI Band
Limit Mask
Min INP
MSC1000G/1024G/1224G Series User's Guide
DESCRIPTION
Enter information to identify the telephone number of the subscriber connected to
this VDSL port. You can use up to 15 English keyboard characters (including
spaces and hyphens).
Select a VDSL line profile to assign to this port in the first drop-down list box. Use
the VDSL Profile screen to configure VDSL port profiles.
Select a profile defined by the VDSL standard from the second drop-down list box.
Select auto to automatically detect the protocol used on the connected line. Select
adsl2 or adsl2+ to specify the only protocol that can be used on this port. Refer to
Table 11.2.4 on page 210 for information on other VDSL2 profiles used in this
screen.
Select an alarm profile to define the thresholds that trigger an alarm on the port
when exceeded.
Specify the default VLAN ID (1~4094) and IEEE 802.1p priority (0~7) to add to
untagged frames received on this port.
If an untagged frame matches a PVLAN setting, the system uses the PVLAN
setting instead.
Tagged frames are handled according to the VDSL line card's VLAN setup.
Select a QoS (Quality of Service) profile from the drop-down box to classify and
prioritize application traffic. Use the Profile > IPQoS screen to configure IPQoS
profiles.
This field displays the bit mask that represents the features that have been
disabled for this connection. Click the bit mask number to open the Option Mask
screen where you can disable attributes for the port. This is for advanced
troubleshooting.
RFI is induced noise on the lines by surrounding radio sources such as AM and
HAM radio stations. To avoid performance degradation due to RFI, set the switch
to not transmit VDSL signals in the RFI band plans defined by the regulatory
bodies. You can also configure your own RFI band plans on the system.
Select ansi to use the RFI band plan settings defined by ANSI.
Select etsi to use the RFI band plan settings defined by ETSI.
Select Disable to deactivate this function.
Select Custom to configure RFI settings in the fields below.
To reduce the impact of interference and attenuation, ITU-T 993.2 specifies a PSD
mask to limit the Power Spectral Density at both downstream and upstream.
Select the correct PSD mask for your region and line conditions. Selecting multiple
PSD masks for a single DSL line or line bundle may increase interference.
See Table 88 on page 233 for a list of Limit Mask profiles available in this screen.
Sudden spikes in the line's noise level (external noise) can cause errors and result
in lost packets. Set the impulse noise protection minimum to have a buffer to
protect the ADSL physical layer against impulse noise. This buffering causes a
delay that reduces transfer speeds. It is recommended you use a non-zero setting
for real-time traffic that has no error correction (such as video-conferencing).
Type DMT (Discrete Multi-Tone) values in the Up Stream and Down Stream fields
provided to specify the level of impulse noise (burst) protection (INP) for a slow (or
interleaved) channel.
INP is defined in this screen as a multiple (between 0.5~160) of 0.1 DMT symbols.
The number of DMT symbols specifies the time in which errors can be completely
corrected. A higher symbol value provides higher error correction capability, but it
causes overhead and higher delay which may increase error rates in received
multimedia data.
Chapter 11 Subscriber Port Setup Screens
229