3. Configuration
8335-A2-GB20-A0
March 2005
3-25
NOTE:
The range of allowed speeds based on spectrum management
requirements as defined in either ANSI T1.417 or BT Access Network
Spectrum standards are calculated and displayed on the DSL Port
Configuration screen. If Spectrum Management is set to Disable on the
Spectrum Management screen (menu selection
A-A-G
) (see
Setting
Spectrum Management (Models 8355, 8375, and 8385)
on page 3-4),
then the
Allowed Speeds
field will display all applicable speeds based
on the Region Setting selected on the Specrum Management screen.
For . . .
Enter . . .
Port Status
Enabled or Disabled.
Estimated Working
Length
This option appears only if Spectrum Management is set to
Enable and Region is set to Annex A on the Spectrum
Management screen (menu selection
A-A-G
). It is the
estimated length of the line in kilofeet, or NoLoad for
non-loaded loops. This value is usually specified by the
carrier.
EWL = L26 + 3(L24)/4, where L26 is the total length of the
26-gauge cable in the loop excluding any bridged tap and
L24 is the total length of 19, 22, or 24-gauge cable in the
loop excluding any bridged tap.
8.5 – 14.5 kft
in .5 kft increments, or
NoLoad
.
Line Length
This option appears only if Spectrum Management is set to
Enable and Region is set to Annex B on the Spectrum
Management screen (menu selection
A-A-G
). It is the
estimated distance from the local exchange, used to
determine the speeds that can be supported. This value is
usually specified by the carrier. Select from the following
(Default = Extra Short):
Extra Short
– Can support speeds up to 2312 kbps (in
64 kbps increments).
Short
– Can support speeds up to 2056 kbps (in 64 kbps
increments).
Medium
– Can support speeds up to 1480 kbps (in
64 kbps increments).
Long
– Can support speeds up to 840 kbps (in 64 kbps
increments).
Allowed Speeds
Displays the range of allowed speeds based on spectrum
management requirements. Speeds are selectable in
64 kbps increments.
Behavior
The training behavior (Default = Adaptive):
Adaptive
– The line card will train up to the highest
operational rate less than or equal to the maximum fixed or
adaptive speed.
Fixed
– The line card will train only at the rate set in the
Fixed Rate field.
