ZyXEL Communications MSC1000G User Manual page 218

Chapter 9 Subscriber Port Setup Screens
Table 96 ADSL Port Setup: Advanced (continued)
LABEL
Power Mode
Max US
TxPower
Max DS
TxPower
Max US Psd
Max DS Psd
Max RxPower
Minimum
Impulse Noise
Protection
Carrier Setup
US Carrier
218
DESCRIPTION
The power mode controls the connection's power adaptivity.
Select fix to set the maximum downstream transmit power to the number you specify in the
Max DS TxPower field.
Select power to give the saving of transmission power priority over the transmission rate.
The line card attempts to reduce its transmit power as much as possible while still
maintaining the configured minimum rate. This only applies to the downstream connection
and the ADSL operational mode must be G.dmt, ANSI T1.413 or G.lite.
Select rate to give the transmission rate priority over the saving of transmission power. The
line card attempts to achieve the maximum configured transmission rate before reducing the
transmit power.
Set the maximum upstream transmit power, -130~200 in 0.1 dBm.
Set the maximum downstream transmit power, -50~200 in 0.1 dBm.
Set the maximum upstream PSD (Power Spectrum Density) mask (between -400 to 40 in
units of 0.1 dBm/Hz).
PSD defines the distribution of a line's power in the frequency domain. A PSD mask is a
template that specifies the maximum allowable PSD for a line.
Set the maximum downstream PSD mask (between -400 to 40 in units of 0.1 dBm/Hz).
Set the maximum aggregate receive power at the line card's port, -255~255 in 0.1 dBm.
This only applies to the ADSL2/2+ ADSL operational modes.
Sudden spikes in the line's noise level (impulse 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 connection against impulse noise. This buffering causes a delay that reduces
transfer speeds. It is recommended that you use a non-zero setting for real time traffic that
has no error correction (like video-conferencing).
Select a number of DMT symbols to use for the minimum upstream impulse noise protection
(Us_Inp) setting.
Select a number of DMT symbols to use for the minimum downstream impulse noise
protection (Ds_Inp) setting.
Use this part of the screen to mask carrier tones. Masking a carrier tone disables the use of
that tone on the ADSL port. Do this to have the system not use an ADSL line's tones that are
known to have a high noise level.
The "0x" at the beginning of the mask fields indicates hexadecimal digits (0~ffffffff) are to be
used. Each mask can use up to 8 hexadecimal digits. Each hexadecimal digit represents 4
tones. The hexadecimal digit is converted to binary and a '1' masks (disables) the
corresponding tone.
Use these fields to disable upstream carrier tones (from 0~63).
Mask0 = tones 0~31
Mask1 = tones 32~63
For example,"0x00000080" in the Mask0 field and "0x00000000" in the Mask1 field disables
upstream carrier tone 8.
Management Switch Card User's Guide