Scramble – Enterasys Networks X-Pedition XSR CLI User Manual
Page 78
T1/E1 & T3/E3 Commands
2-72 Configuring T1/E1 and T3/E3 Subsystems
Mode
Controller configuration:
XSR(config-controller xx)#
Default
1
Example
The following example configures the E3 controller in slot 1, card 2 with line source clocking and a
national reserved bit of 0:
XSR(config)#controller e3 1/2/0
XSR(config-controller
XSR(config-controller
scramble
For T3/E3 controllers only
This command assists clock recovery on the receiving end of a T3/E3 port by randomizing the
pattern of 1s and 0s carried in the physical layer frame. Randomizing the bits can prevent
continuous, non‐variable bit patterns, in other words, long strings of all 1s or 0s.
Several physical layer protocols rely on transitions between 1s and 0s to maintain clocking.
Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms. The
following conditions must be met:
•
Scrambling is used only for full‐rate/sub‐rate T3/E3 ports and they must be configured as
unchannelized for scrambling to take affect.
•
Remote and local T3/E3 scrambling configuration must match.
•
For T3 controllers, all DSU modes support scrambling except Clear mode.
•
For E3 controllers, only Kentrox mode supports scrambling.
•
This value is configurable only on an unchannelized T3/E3 port.
Syntax
scramble
Syntax of the “no” Form
The no form of this command disables scrambling:
no scramble
Mode
Controller configuration:
XSR(config-controller xx)#
Default
Disabled