Model CFA-24 Transparent Cable Farm Automation Switch Reference Manual Page 30 of 78
Considerations When Selecting Coordinate Types and Lengths
The CFA-24 solution is designed for VDSL2 Vectoring and G.fast testing. Selections are verified to be certain they do
not deviate from the appropriate choices for this type of testing. In the event this occurs, the row containing the error is
highlighted.
Multi-pair vs Single-Pair Selections
There is a difference in the Allowable Line Lengths results in Test Maintenance when assigning coordinate types of
Multi-Pairs vs Single Pairs in the Coordinate Matrix screen:
•
Multi-Pairs:
o
Allowable Line Lengths results in Test Maintenance, for a particular channel, are determined by
adding each segment length, beginning with the CO side of the unit (on segment 1).
o
The Test Maintenance screen is used to select which segments are included in the Allowable Line
Lengths computation.
o
This coordinate type is required when enabling Multiple Vectoring Groups. All channels in a
Vectoring Group must contain at least one MP coordinate.
•
Single-Pairs:
o
Single-Pair segments are automatically included as part of the Allowable Line Lengths computation.
Rules
Multi-Pair Coordinate Type (referred to as MP’s below):
•
When using MP’s on a particular channel, a minimum of two MP’s must be assigned to that channel.
•
An MP must have the same length as all the other MP’s in the same segment row. This applies regardless
of how many Vectoring Groups are used.
•
When configuring a series of MP’s on a particular channel, configure the first one (lowest numbered one)
beginning on the CO side. Any MP after that, on the same channel, must be assigned to a higher segment
number.
•
If enabling multiple Vectoring Groups, the number of MP coordinates determines how many Vectoring
Groups are available for selection.
Single-Pair Coordinate Type (referred to as SP’s below):
•
An SP can have any length.
•
Multiple SP’s allowed per channel.
•
Any SP segment number must be higher than any MP segment number on the same channel.
