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Chapter 16 xDSL Port Setup

IES-1248-51V User’s Guide

126

Sudden spikes in the line’s noise level (impulse noise) can cause

errors and result in lost packets. Set the impulse noise protection

minimum to have a buffer to protect the ADSL physical layer

connection against impulse noise. This buffering causes a delay that

reduces transfer speeds. It is recommended that you use a non-zero

setting for real time traffic that has no error correction (like

videoconferencing).

US INP Set the minimum upstream (US) impulse noise protection setting.

DS INP Set the minimum downstream (DS) impulse noise protection setting.

Max US TX PSD Specify the maximum upstream transmit power (-256 ~ 255 in

0.1dBs).

Max DS TX PSD Specify the maximum downstream transmit power (-256 ~ 255 in

0.1dBs).

L0 Time Set the minimum time (in seconds) that the ADSL line must stay in L0

power mode before changing to the L2 power mode.

L2 Time Set minimum time (in seconds) that the ADSL line must stay in the L2

power mode before reducing the power again in the L2 power mode.

L2 ATPR Set the maximum Aggregate Transmit Power Reduction (ATPR) in

decibels (dB) that is permitted in a L2 power reduction. The system

can gradually decrease the ADSL line transmission power while it is in

the L2 power mode. This is the largest individual power reduction

allowed in the L2 power mode.

L2 ATPRT Set the maximum Aggregate Transmit Power Reduction Total (ATPRT)

in decibels (dB) that is permitted in the L2 power mode. This is the

total transmit power decrease that is allowed to occur in the L2 power

mode.

Max L2 Rate Set the maximum transfer rate (in Kilobits per second) that is

permitted while the port is in the L2 power mode. The supported

range is 32~4096 Kbps in 4 Kbps increments. If you enter a number

that is not a multiple of 4, the system uses the next lower multiple of

4. If you enter 39 for example, the system will use 36. Set this to 0 to

have the system automatically assign a value.

Min L2 Rate Set the minimum transfer rate (in Kilobits per second) that is

permitted while the port is in the L2 power mode. The supported

range is 32~4096 Kbps in 4 Kbps increments. If you enter a number

that is not a multiple of 4, the system uses the next lower multiple of

4. If you enter 39 for example, the system will use 36. Set this to 0 to

have the system automatically assign a value.

L0 to L2 Rate Set the down stream transfer rate (in Kilobits per second) that serves

as the threshold for whether the port is to use the L0 or the L2 power

mode. The system changes from L0 mode to L2 mode when the

downstream transfer rate stays below this threshold for L0 Time. The

system changes back from L2 mode to L0 mode when the

downstream transfer rate goes above this threshold. This rate must

be less than or equal to one half of the Min L2 Rate and at least 16

Kbps. Set this to 0 to have the system automatically assign a value.

Table 21 xDSL Port Setting (continued)

LABEL DESCRIPTION

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 653 654

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