System information

Configuring the Switch
3-58
VDSL Port Configuration
You can enable/disable a selected port, enable disable Remote Digital Loopback
(RDL), set the optimal transmission rate, and configure a profile for the selected
port.
Command Attributes
• Active Status – Check this box to enable the selected port.
• RDL – Check this box to enable Remote Digital Loopback (RDL). Remote
Digital Loopback (RDL) tests the link between the switch and the CPE by
sending out, and returning data through the CPE, over the VDSL link
(see “efm rdl” on page 4-107). (Default: Disabled)
• Profile – Configures a profile for the selected port.
• PBO – Enables/disables power back-off on the selected port. 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.
• Noise 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
• Interleave – Interleaving on the 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 interleaver block length.
Range: 4 or 8; Upstream default value: 8, Downstream default value: 8