ZyXEL Communications MSC1000G User Manual page 342

Chapter 11 Profile Screens
Table 160 Profile > VDSL2 > LineProfile (continued)
LABEL
Bitswap
Max Rx Power
Max Tx Power
Min Overhead Rate
Limit PSD Mask
Transmission
Mode
Class Mask
Limit Mask
US0 Mask
UPBO
UPBOKL
UpStream Band
1 ~ 4
US0
342
DESCRIPTION
Select On to allow on-line bits and power (for example, margin) reallocation among the
allowed sub-carriers without service interruption or errors. This helps to keep
transmission data rates on a high SNR VDSL2 line.
Select Off to disable it.
Enter the maximum receiving power in dBm for UpStream traffic. Select noLimit if
there is no limit.
Enter the maximum transmission power in dBm the system uses for DownStream
traffic. Enter the maximum transmission power the CPE uses for UpStream traffic.
Enter the minimum transmission rate (4~248 kbps) reserved for a line's overhead
channel. Both the system and CPE device use the overhead channel of a line to get
transmission statistics with each other.
To reduce the impact of interference and attenuation, ITU-T G.993.2 specifies a limit
PSD mask that limits the VDSL2 transmitters PSD at both downstream and upstream.
This is the transmission standard for this profile. At the time of writing G.993.2 Annex
A mode is supported (for countries which follow the North American VDSL2 standard).
A class mask is a combination of several PSD masks according to the PSD mask types.
The available options vary depending on the selection in the Transmission Mode field.
At the time of writing, 998 is supported.
Select a downstream limit mask you want the system to use.
Select a limit mask you want the system to use for the upstream band 0.
UPBO (Upstream Power Back-Off) mitigates far-end crosstalk (FEXT) caused by
upstream transmission on shorter loops to longer loops. See
Select Auto to enable UPBO and CPE devices' PSD adjustment based on the negotiation
result with the MSC.
Select Override to force CPE devices to use the electrical length defined by the MSC (in
the UPBOKL field below) to compute their UPBO. See
Select Disable to turn UPBO off.
Enter variable A and B values of upstream band 1 and band 2 for UPBO PSD mask
calculation.
Specify the electrical length (0~128 dB) of the cable between the system and CPE
devices. See Section 9.2.9 on page
Specify 4000~8095 (0.01dBm/Hz) for parameter A which defines the original band
shape. Specify 0~4095 (0.01dBm/Hz) for parameter B which defines the power back-
off degree.
Specify whether you want the system to automatically activate the upstream band
(enable) or not (disable) when necessary. Select Allow to have CPE and the system
use the upstream band 0 for upstream traffic over long distances. If you select disable,
the CPE may not able to transmit data over long distances.
Section 9.2.7 on page
Section 9.2.9 on page
208.
Management Switch Card User's Guide
207.
208.