ZyXEL Communications MSC1024G Series User Manual page 221

Table 82 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
MSC1000G/1024G/1224G Series User's Guide
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.
Chapter 11 Subscriber Port Setup Screens
221