ZyXEL Communications MSC1000G Series, User Manual

Page: 896 / 1168

Chapter 30 profile Commands
Management Switch Card User’s Guide
896
[maxsnrmds <max_margin_ds>]
[maxsnrmus <max_margin_us>]
= The downstream (ds) and upstream (us) maximum
SNR (Signal to Noise Ratio) margin allowed on the
line. When the actual SNR margin is going to reach
this specified value, this mechanism forces connected
CPE device(s) to lower its transmission power level
and maintains the actual SNR margin equal to or less
than this value.
max_margin_ds
: <target_margin_ds>~310 in 0.1dB
or disable
max_margin_us
: <target_margin_us>~310 in 0.1dB
or disable
[minsnrmds <
min_margin_ds
>]
[minsnrmus <
min_margin_us
>]
= The downstream (ds) and upstream (us) minimum
SNR margin accepted on the line to which this profile
applies.
<min_margin_ds>
: 0~<target_margin_ds> in 0.1dB
<min_margin_us>
: 0~<target_margin_us> in 0.1dB
[msgminds <
msgmin
>]
[msgminus <
msgmin
>]
= The downstream (ds) and upstream (us) minimum
transmission rate reserved for a line’s overhead
channel. Both the system and CPE device use the
overhead channel of a line to get VDSL transmission
statistics with each other.
<msgmin>
: minimum message-based overhead rate,
4~236 in kbps
[maxnomatpds <
tx_power
>]
[maxnomatpus <
tx_power
>]
= The maximum transmission power (0~205 in 0.1
dBm) the system uses for downstream (ds) traffic.
Enter the maximum transmission power the CPE uses
for upstream (us) traffic.
[maxaggrxpwrus < rx_power >]
= The maximum receiving power (-255~255 in 0.1
dBm or disable) for upstream (us) traffic.
[rfiband <start_tone> <end_tone> [...]] = Specifies the starting and ending tones for each RFI
band according to your location.
RFI (Radio Frequency Interference) is induced noise
on the lines by surrounding radio frequency
electromagnetic radiation from sources such as AM
and HAM radio stations. Since VDSL uses a much
larger frequency range that overlaps with other radio
frequency systems, signals from VDSL lines and
other radio systems interfere with each other. To
avoid performance degradation due to RFI, set the
system to not transmit VDSL signals in the RFI band.
<start_tone>
: 1~4096 in units of 4.3125 kHz, 0
means not used
<end_tone>
: 1~4096 in units of 4.3125 kHz, 0
means not used, equal to or larger than
<start_tone>
[bitswapds disable|enable]
[bitswapus disable|enable]
= Turn on downstream (ds) or upstream (us) bitswap 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 VDSL line.
[snrmodeds disable|enable]
[snrmodeus disable|enable]
= Enables or disables the downstream (ds) or upstream
(us) transmitter reference virtual noise.