Primary And Fallback Vdsl Templates Example - ZyXEL Communications VES1724-56 User Manual

Chapter 9 VDSL Setup
Secondly, you need to create several VDSL templates and configure their VDSL line profiles and
channel profiles in the VDSL Setup > VDSL Profile screen. Examples are shown next.
Table 29 VDSL Template Examples
VDSL TEMPLATE
Template-A
Template-B
Template-C
Template-D
Then you can assign VDSL templates to VDSL ports in the VDSL Setup > VDSL Line Setup screen
(see Section 9.2 on page
Table 30 VDSL Template Examples
PORT PRIMARY TEMPLATE
1 Template-A
2 Template-C
3 Template-E
4 Template-G

9.1.2 Primary and Fallback VDSL Templates Example

On this Switch, you can specify a primary and a fallback VDSL template for each subscriber port. A
subscriber port uses the parameters defined in the primary VDSL template when the line is
initialized. When the actual line condition is too poor to use the primary template (for example, the
defined minimum transmission rate cannot be reached), the Switch then uses the fallback template
instead. You should select a looser fallback template for a line. See an example as shown next.
Table 31 Primary and Fallback VDSL Template Settings Example
MIN RATE
TARGET SNR MARGIN
US0 MASK
The template F differs from templates P as follows.
• A lower transmission rate is allowed.
• Has higher tolerance against noise.
• Uses a wider band for US0 mask.
• Using F can get higher bandwidth for upstream traffic when the line has poor quality or in a long
distance.
102
VDSL LINE PROFILE VDSL CHANNEL PROFILE
LineProfile-2 ChanProfile-1
LineProfile-1 ChanProfile-3
LineProfile-2 ChanProfile-2
LineProfile-3 ChanProfile-1
103).
FALLBACK TEMPLATE
Template-B
Template-D
Template-F
Template-H
PRIMARY TEMPLATE (P)
DS: 10 Mbps, US: 2 Mbps
6 dB
EU32
FALLBACK TEMPLATE (F)
DS: 9 Mbps, US: 1.5 Mbps
5 dB
EU128
VES1724-56 User's Guide