ZyXEL Communications IES-1248-71, Руководство пользователя

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Chapter 55 ADSL Commands
IES-1248-71/73 User’s Guide
372
where
This command displays or sets the downstream maximum nominal transmit PSD (Power
Spectral Density).
The following example sets the downstream maximum nominal transmit PSD for port 7 to 10
dB.
55.1.13 ADSL Upstream Carrier Command
Syntax:
ras> adsl uscarrier <portNo> [<m0>]
where
The hexadecimal digit is converted to binary and a '1' masks (disables) the corresponding tone.
Disabling a carrier tone turns it off so the system does not send data on it.
This command displays or sets masks for upstream carrier tones from 0 to 31. Masking a
carrier tone disables the use of that tone on the specified ADSL port. Use this command to
have the system not use an ADSL line’s tones that are known to have a high noise level. The
most significant bit defines the lowest tone number in a mask.
The most significant bit defines the first tone sequentially. For example, in <m0>, 0x00000001
means tone 31. You can only have one range of upstream carrier tones enabled. For example,
you could use 0xffff0000 for <m0> to disable upstream carrier tones 0~15 and leave tones 16
~ 31 enabled. You cannot use 0x00000080 for <m0> to disable upstream carrier tone 24,
however, because it would leave two ranges of tones enabled (0-23 and 25-31).
The following example disables upstream carrier tones 0~15 for ADSL port 5.
<max nominal
psd> =
-256 ~ 255 (0.1dB)
Figure 235 ADSL Downstream PSD Command Example
ras> adsl dsnompsd 7 100
<m0>
,
<m1> =
The upstream subcarriers to be masked (disabled). <m0> can
use up to 8 hexadecimal digits (0~ffffffff) and represents 32
carrier tones (each hexadecimal digit represents 4 tones).
<m0>
= tones 0~31
The hexadecimal digit is converted to binary and a '1' disables
the corresponding tone. Disabling a carrier tone turns it off so
the system does not send data on it.
Figure 236 ADSL Upstream Carrier Command Example
ras> adsl uscarrier 5 ffff0000