Chapter 52 ADSL Commands

52.2.2 Linedata Command

Syntax:

ras> statistics adsl linedata <portlist>

where

<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>.

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).

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

358

 

IES-612-51A User’s Guide