Specifications

Chapter 4 Configuration Installation and Operation Manual
4-20 Configuring for Operation ASMi-52 Ver. 2.8
• 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.
³ To configure the power spectral density:
1. From the SHDSL Local Port menu, select Asym PSD (Main menu >
Configuration > SHDSL Configuration > SHDSL Local Port > 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-52 units automatically detect the line power density. This
parameter is permanently set to Sym/Asym Enable and cannot be changed.
Configuring Line Probing
By configuring this parameter, you force ASMi-52 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-52 units with the 2-wire line interface support fixed and
adaptive rates, remote units operate with adaptive rate only.
ASMi-52 units with the 4-wire line interface support only fixed rate.
³ To configure line probing:
1. From the SHDSL Local Port menu, select Line Prob (Main menu >
Configuration > SHDSL Configuration > SHDSL Local Port > Line Prob).
The display is refreshed and a new value appears.
2. Select Save to save the changes.
Setting the Loop Attenuation Threshold
Loop attenuation is different (in dB) between the power transmitted from the
ASMi-52 modem and the power received by the unit operating at the other side
of the application. By setting the threshold, the modem is instructed to generate
minor alarm (LOOP ATTN. OVER LINE A/B) when the selected loop attenuation
threshold value is exceeded.
³ To set the loop attenuation threshold:
1. From the SHDSL Local Port/SHDSL Remote Port/SHDSL Repeater menu, select
Loop attenuation threshold (Main menu > Configuration > SHDSL
Configuration > SHDSL Local Port/SHDSL Remote Port/SHDSL Repeater > Loop
Attenuation Threshold).
The loop attenuation threshold can be configured from the SHDSL remote or
local port, or from the SHDSL repeater.
2. Enter the required value (0 dB to 127 dB for the SHDSL remote/local port or
0 dB to 15 dB for the SHDSL repeater).
3. Select Save to save the changes.
Note