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 4-105). (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 receive 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 – When rate adaptation is enabled, the Signal-to-Noise Ratio
(SNR) is an indicator of link quality. The switch itself has no internal functions to
ensure link quality. To ensure a stable link, you should add a margin to the
theoretical minimum Signal-to-noise ratio (SNR). The table below lists
theoretical ninimum SNR’s for the VDSL profiles configurable on this switch.
Profile Name Theoretical Minimum Signal-to-Noise Ratio (dB)
DS1 DS2 US1 US2
Default 10 Not Used 10 Not Used
A1-02OAG-R1 17 Not Used 14 Not Used
A2-02OAG-R1 20 Not Used 14 Not Used
A3-01OAG-R1 23 10 17 Not Used
A4-01OAG-R1 26 20 20 Not Used
S1-03OAG-R1 17 Not Used 20 10
S2-03OAG-R1 20 Not Used 20 14
S3-00OAG-R1 23 10 23 20
S1-16-16 20 10 20 17
A1-34-11 29 20 17 14
S2-16-16A 20 10 20 17
A2-34-11A29201714
A3-25-3 26 10 17 Not used
A4-45-5 32 23 17 10
