System information

Configuring the Switch
3-60
VDSL Port Link Status
Command Attributes
• General Status
- Link – Shows the status of the VDSL link.
- Noise Margin – The noise margin indicates how much the noise on the
selected VDSL port 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
• PMD* Status
- SNR (dB) –The signal-to-noise ratio of the VDSL line.
- Downstream Rate (Mbps) – The rate at which data is transmitted from the
switch to the CPE.
- Upstream Rate (Mbps) – The rate at which data is transmitted from the CPE
to the switch.
- PBO – Indicates the status of the power back-off mechanism (on/off). If PBO
is enabled the power of transmission from the port will automatically be
adjusted to ensure that the signal successfully reaches the reception port.
- Rate Adaptation – The data rate on a VDSL line can be affected by factors
such as temperature, humidity, and electro-magnetic radiation. When rate
adaption is enabled, the switch will determine the optimal transmission rate for
the current conditions.
* Physical Media Dependent
• PMS-TC* Status
- Reed-Solomon Errors – The number of errors in data that have been
corrected by the Reed-Solomon code.
- Interleave – Interleaving improves Reed Solomon error correction when there
is pulse noise. A greater degree of interleaving will provide more protection
against pulse noise but will increase transmission delay and reduce the
effective bandwidth of the link. The degree of interleaving can be increased
by increasing M or I.
- M – The interleaving depth index.
Range: 0-64, Upstream default value: 8, Downstream default value: 16
- I – The interleaving block length.
Range: 4 or 8; Upstream default value: 8, Downstream default value: 8
protection.
* Physical Medium Specific Transmission Convergence