Specifications

Chapter 4 Configuration ASMi-52L Installation and Operation Manual
4-14 Configuring the Physical Ports
Configuring the Current Margin
The current margin indicates the minimum desired target margin for the local line
conditions during the startup sequence. This setting is available only if the rate
adaptation is enabled (see the line probing configuration below).
Disabling the current margin parameter allows the use of all line rates, regardless of
line condition.
To configure the current margin:
1. From the SHDSL Port Configuration menu, select Current margin.
The Current Margin menu appears. The display is identical to the Snext
Margin menu, except for its title (see Figure 4-17).
2. Select the current margin by typing the number corresponding to the desired
value, and press <Enter>.
SHDSL Port Configuration menu appears.
3. Select Save to save the changes.
Configuring the Power Spectral Density
By configuring the power spectral density, you define the amount of power applied
to the spectrum of frequencies that carry the information signal in order to achieve
a satisfactory level of signal strength at the receiving end of the circuit.
The power spectral density can be configured for the ASMi-52L units with the line
probing set to fixed.
The power spectral density value depends on the selected modems compatibility:
Annex A or Annex B. The possible values are:
Symmetric, supported in both Annex A and Annex B modes.
Asymmetric, supported in Annex A at 768 kbps and in Annex B at 2048 kbps.
To configure the power spectral density:
1. From the SHDSL Port Configuration menu, select Asym PSD to choose the
power spectral density value: symmetrical or asymmetrical.
The display is refreshed and a new value appears.
2. Select Save to save the changes.
Remote ASMi-52L units automatically detect the line power density. This parameter
is permanently set to Sym/Asym Enable and cannot be changed.
Configuring the Line Probing
By configuring this parameter, you force ASMi-52L to perform line probing in order
to find the best possible rate of transmission – adaptive rate. Or you command the
modem to skip the rate adaptation phase – fixed rate.
Only central ASMi-52L units with the 2-wire line interface support fixed and
adaptive rates, remote units operate with adaptive rate only.
ASMi-52L units with the 4-wire line interface support only fixed rate.
Note
Note