ZyXEL IES-612-51A User Manual download pdf (Page 358)

Chapter 52 ADSL Commands

IES-612-51A User’s Guide

358

52.2.2 Linedata Command

Syntax:

ras> statistics adsl linedata <portlist>

where

This command shows the line bit allocation of a DSL port.

Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth into tones. This

command displays 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 DSL transmission rates, and possibly to determine whether certain specific types of

interference or line attenuation exist. See 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.

“upstream carrier load” displays the number of bits transmitted per DMT tone for the upstream

channel (from the subscriber’s DSL modem or router to the IES-612-51A).

“downstream carrier load” displays the number of bits received per DMT tone for the

downstream channel (from the IES-612-51A to the subscriber’s DSL modem or router).

The bit allocation contents are only valid when the link is up.

In the following example, the upstream channel is carried on tones 7 to 39 and the downstream

channel is carried on tones 53 to 259 (space is left between the channels to avoid interference).

<portlist> =

You can specify a single DSL port <1>, all DSL ports <*> or

a list of DSL ports <1,3,5>. You can also include a range of

ports <1,5,6~10>.

Figure 242 Linedata Command Example

ras> statistics adsl linedata 1

[port 1]

up stream carrier load: number of bits per symbol(tone):

tone 0- 19: 00 00 00 00 00 00 02 03 04 05 - 06 07 07 07 07 07 07 07 08 08

tone 20- 39: 08 08 07 08 08 07 07 06 06 05 - 04 03

down stream carrier load: number of bits per symbol(tone):

tone 0- 19: 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00

tone 20- 39: 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00

tone 40- 59: 00 00 00 00 00 00 00 00 00 00 - 00 00 00 01 01 01 01 01 01 02

tone 60- 79: 02 02 02 02 00 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 80- 99: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 100- 119: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 120- 139: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 140- 159: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 160- 179: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 180- 199: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 200- 219: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 220- 239: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02 02 02 02 02

tone 240- 259: 02 02 02 02 02 02 02 02 02 02 - 02 02 02 02 02 02

1 2 ... 353 354 355 356 357 358 359 360 361 362 363 ... 443 444

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