ZyXEL Communications IES-1000 User Manual page 202

24.3.5 Enable Ports Command
Syntax:
192.168.1.1 adsl> enable ports
The enable ports command forcibly enables all ADSL ports.
The factory default of all ports is disabled. A port must be enabled before data transmission can
occur. An enabled but disconnected ADSL port generates more heat than an operating port. To
minimize heat generation and to enhance reliability, remember to disable a port when it is not in
24.3.6 Linedata Command
Syntax:
192.168.1.1 adsl> linedata <port number>
where
<port number> = A port number, from 1 to 8.
The linedata command shows the line bit allocation of an ADSL port.
Discrete Multi-Tone (DMT) modulation divides up a line's bandwidth into tones. This command displays
hexadecimal digits that indicate the number of bits transmitted for each tone. This can be used to determine the
quality of the connection, whether a given sub-carrier loop has sufficient margins to support ADSL transmission
rates, and possibly to determine whether certain specific types of interference or line attenuation exist. Refer to the
ITU-T G.992.1 recommendation for more information on DMT.
The better (or shorter) the line, the higher the number of bits transmitted for a DMT tone. The maximum number
of bits that can be transmitted per DMT tone is 15.
"DS carrier load" displays the number of bits transmitted per DMT tone for the downstream channel (from the
network module to the subscriber's DSL modem or router).
"US carrier load" displays the number of bits received per DMT tone for the upstream channel (from the
subscriber's DSL modem or router to the network module).
The bit allocation contents are only valid when the link is up.
In the following example, the numbers of bits for two DMT tones display together. "44" displays for DMT tones
96 and 97. This means DMT tone 96 transmitted 4 bits and tone 97 transmitted 4 bits. Where neither of the two
tones transmitted any bits, a single "0" is displayed (like tones 0 and 1 for example).
In the following example, the downstream channel is carried on tones 38 to 240 and the upstream channel is
carried on tones 9 to 31 (space is left between the channels to avoid interference).
ADSL Commands
use.
IES-1000 User's Guide
24-3