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Configuring the Switch
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
Default
A1-02OAG-R1
A2-02OAG-R1
A3-01OAG-R1
A4-01OAG-R1
S1-03OAG-R1
S2-03OAG-R1
S3-00OAG-R1
S1-16-16
A1-34-11
S2-16-16A
A2-34-11A
A3-25-3
A4-45-5
3-58
Theoretical Minimum Signal-to-Noise Ratio (dB)
DS1
DS2
10
Not Used
17
Not Used
20
Not Used
23
10
26
20
17
Not Used
20
Not Used
23
10
20
10
29
20
20
10
29
20
26
10
32
23
US1
US2
10
Not Used
14
Not Used
14
Not Used
17
Not Used
20
Not Used
20
10
20
14
23
20
20
17
17
14
20
17
17
14
17
Not used
17
10
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