ZyXEL Communications MSC1024G Series User Manual page 336

Chapter 13 Profile Screens
Table 145 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
PM Mode
US0
336
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
on page 211.
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
on page 212.
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 11.2.9 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.
Select allowTransitionsToIdle to have the system or CPE devices
autonomously enter an idle state for power management (PM).
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.
212.
MSC1000G/1024G/1224G Series User's Guide
Section 11.2.7
Section 11.2.9