System information

VDSL Configuration
3-65
Displaying VDSL Interface Information
Command Attributes
• Line – Select the VDSL line from the drop-down list.
• Channel – Select Slow or Fast from the drop-down menu. The switch uses the
slow channel for data that requires a very low error rate in transmission. The
switch uses the fast channel for data such as voice/video signals that require
fast delivery, but for which a small error rate is acceptable.
• Side – This only displays Local. All information displayed is for data
transmission from the switch to the CPE.
• Physical Interfaces Information
- Serial Number – A number given by the manufacturer to the item produced.
This only displays on the CPE side.
- Vendor ID – The name of the manufacturer of this switch.
- Version Number – The number of the current hardware.
- Current Signal to Noise Ratio Margin – The noise margin indicates how
much the noise on the selected VDSL can increase before the signal is
affected. As the noise on the line increases, the margin will approach zero. If
the noise exceeds the current noise margin, the signal will be lost. You will
then need to increase the margin until the signal is restored.
Range: 0-9 dBm Default: 0 dBm
- Current Attenuation – The attenuation of the signal.
Units: db
- Current Status – This displays defects in the VDSL line in the current
version, this always displays 0, which means no defects.
- Current Output Power – The total output power transmitted on this line.
Units: 0.1 dBm.
- Current Attainable Rate – The maximum line data rate using the current
profile.
Unit: bits per second
- Current Line Rate – The current line data rate.
Unit: bits per second
• Channel Interface Information
- Interleave Delay – Transmission delay caused by the use of interleaving.
Units: milliseconds
- CRC Block Length – Cyclic Redundancy Code (CRC) is a number derived
from, and transmitted with, data frames in order to detect corruption of data.
- Current Transmit Rate* – The current rate of data transmission.
- Current Transmit Slow Burst Protect* – Actual level of impulse noise
(burst) protection for an interleaved (slow) channel. This parameter is not
applicable to fast channels. For fast channels, a value of zero is returned.
- Current Transmit Fast Forward Error Correction* – Actual Forward Error
Correction (FEC) redundancy related overhead for a fast channel. This
parameter is not applicable to an interleaved (slow) channel. For interleaved
channels, a value of zero shall be returned.
* Not supported in the current version