ZyXEL Communications IES-1248-51 Guía de usuario descargar pdf (Pagina 153)

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Chapter 18 xDSL Line Data

IES-1248-51V User’s Guide

153

18.2 xDSL Line Data Screen

This screen displays an ADSL port’s line bit allocation.

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

This screen 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 ADSL 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.

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

To open this screen, click Basic Setting > xDSL Line Data > Line Data.

Up Stream Output

Power

This field displays the amount of power that the subscriber’s ADSL

modem or router is using to transmit to this port. The total output

power of the transceiver varies with the length and line quality. The

farther away the subscriber’s ADSL modem or router is or the more

interference there is on the line, the more power is needed.

Info Atur

Info Atuc

The Info Atur fields show data acquired from the ATUR (ADSL

Termination Unit – Remote), in this case the subscriber’s ADSL

modem or router, during negotiation/provisioning message

interchanges. This information can help in identifying the subscriber’s

ADSL modem or router.

The Info Atuc fields show data acquired from the ATUC (ADSL

Termination Unit – Central), in this case IES-1248-51V, during

negotiation/provisioning message interchanges.

The vendor ID, vendor version number and product serial number are

obtained from vendor ID fields (see ITU-T G.994.1) or R-MSGS1 (see

T1.413).

A. At the time of writing, the IES-1248-51V always uses Trellis coding.

Table 29 xDSL Line Rate Info (continued)

LABEL DESCRIPTION

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 653 654

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